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Expert Answers about Wiring


  • Brake Controller Installation on 2011 Tiffin Motorhome on 2011 Freightliner Sprinter Chassis
  • Although the Sprinter chassis might have connector for the installation of a brake controller, our brake controller manufacturers don't show a listing for your vehicle. If your MH came with a 7-way at the rear bumper, it might possibly be pre-wired for a brake controller. You'd want to check with Tiffin to see if this is the case, and if so, find out which plug-and-play brake controller wiring harness is needed. If there is no 7-way, you'll need to do a hardwire install. The first step...
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  • 1986 Jayco Econoline Class C Troubleshooting Dash Lights and Running Lights not Working
  • Without knowing more about the problem you are experiencing, like whether it's the vehicle that's experiencing the problems or the trailer wiring, the best recommendation I could give would be to check the fuse box looking for running light and dash light circuits and replace the circuits as needed as this would be the most likely cause of the problem you have. Beyond that you would want to track down wiring diagrams of your vehicle to see if wiring is damaged and needs replacing. At...
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  • Trailer Wiring Harness for a 1957 Chevy Pickup Truck
  • The first thing to determine is why the other converters stopped working so soon. Modern converters are designed to work on 12 volt systems with a negative ground. Many older vehicles used a 6 volt system and/or positive ground electrical system. Make sure that the 1957 Chevy Pickup truck is a 12 volt, negative ground system. It is also possible that the trailer has enough lights to overdraw the converters. Converters have amperage ratings and if exceeded that can cause them to blow....
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  • Converter To Wire 4-Way Connector On 2009 Jeep Compass To 7-Way European Connector On Trailer
  • We currently do not carry the vehicle-side plug for a European plug like you mentioned is on your motorcycle trailer. You will need to find one locally. You can use the tail light converter like part # 118158, and along with a 4-way harness like part # 18004, you can make an adapter that will work for you. I have attached a photo with all of the wires for input and output noted you can check out. Diodes will not be needed because the trailer will not backfeed through the system.
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  • Why Do Some Vehicles Need a Converter to Add Trailer Wiring Like a 2001 Chrysler Town & Country
  • Converters are required when a vehicle has what is called a 3-wire or separate lighting system. These systems will have turn signal circuits that are separate from the brake light circuits. Trailers use a 2-wire or combined system meaning the brake lights and turn signals are on the same circuit. A converter is needed to take the separate signals from the vehicle and combine them so that the trailer lights operating on a combined system will work properly. Wires and fuses connected...
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  • Location of Wire for Third Brake Light on Camper Top of 2010 Sierra 2500HD
  • Look under the dash for the dedicated brake light wire. It will be situated below and left to the steering column. Find the bundle of wires held together with white tape. The tape should have the functions of the wires on it. The wire you need is likely light blue. Test it with a circuit tester, like # 3808, to be sure it is the correct one. It should only show a signal when the brake pedal is pressed. If that wire is used by a brake controller, look at the brake switch located above...
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  • Troubleshooting Trailer Running Light Circuit that Quit Working on a Tow Vehicle
  • Sounds like a blown fuse on your tow vehicle. Check out the fuse panel and look for tow package related fuses and check them all. Most likely one will be blown and need to be replaced. I attached an FAQ on 4-way troubleshooting for you to check out as well.
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  • Troubleshooting Trailer Blinkers that Both Blink When Either Turn Signal is Applied
  • It sounds like you have the blinker circuit of your 1998 F150 run to the running lights circuit on your trailer wiring so when the blinker is applied both of your running lights are flashing. Any time you see trailer lighting that illuminates dimly when the wrong circuit is applied is usually indicates that there is a weak ground on the trailer wiring circuit. How that all works is beyond me, but what you will want to do is return the trailer to the previous wiring configuration you...
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  • Troubleshooting Trailer Lights that Don't Function Properly Vehicle Head or Running Lights are On
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
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  • 4-Way Recommendation for a 1997 Dutchmen Popup with a 6-Way Square
  • The pinout of the # 30104 that you referenced will only work on Jayco trailers. Although the connector is the same the wires are run to different pins on the 6-way side of the connector. Your best option would be to cut off the 6-way on your trailer and then wire up a 4-way to the trailer wires. For that I would recommend the # HM48110. You will need to wire the 4-way up by function to your trailer and not wire color as they most likely are different. The yellow wire of the 4-way...
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  • Hopkins Quick-Install Trailer Connector Adapter # HM47200 Recommendation for a 2003 Dodge Dakota
  • Yes, the Hopkins Endurance Quick-Install Trailer Connector Adapter # HM47200 that you referenced would work great for you and would only require you to plug the 4-way of the adapter into the 4-way of your 2003 Dodge Dakota and the trailer lights would function.
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  • Length of the Wires of the Pollak 7-Pole and 4-Pole Trailer Connector # HM40975-11998
  • The total length of the wires of the Pollak 7-Pole and 4-Pole Trailer Connector # HM40975-11998 is 4 feet. I attached a review video for this product for you to check out as well.
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  • Trailer Wiring Harness # 119178KIT Installation Method for Kia Sportage 4-Cylinder
  • Thank you for your recent purchase of a trailer wiring harness for your Kia Sportage. The Tow Ready kit you selected, part # 119178KIT, is a specified fit for the 2006 Kia Sportage 4-cylinder. Since this is a universal-fit harness it will install in essentially the same way in all vehicles it fits. The process consists of removing the two taillight assemblies, using the included circuit tester to confirm the correct wires to splice into, and then using the included quick-splice connectors...
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  • 7-Way Round to 7-Way Flat Trailer Adapter Recommendation for a 1993 Ford Bronco
  • As long as the 7-ways on both your 1993 Ford Broco and your Fleetwood camping trailer are wired up like the diagrams I attached the Pollak Trailer Connector Adapter # PK12-724 that you referenced would work as-is without having to be rewired. I also attached a review video for this adapter.
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  • Does RV Power Cord Adapter, 50A Male to 30A Female have a UL Rating
  • I spoke with my contact at Coleman Cable about RV Power Cord Adapter, 50A Male to 30A Female # 09554. He said that this particular product is not UL rated (or CSA rated for Canada).
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  • Can I Charge Phone with Hopkins Multi-Tow Trailer Connector Adapter While Truck is Off
  • I spoke with my contact at Hopkins and he said as long as your Tundra is wired so the accessory power is hot all the time (and most of them are) then you will be able to charge your phone with the Hopkins Multi-Tow Trailer Connector Adapter, part # HM47675, when the truck is off. I have included a link to the installation instructions for you to check out.
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  • Troubleshooting Why Trailer Lights Go Out When You Hit the Brakes
  • It sounds to me like you may have a ground problem. There are several places to look for a poor ground connection. I recommend starting with the trailer connector on the trailer. Check to make sure that the ground wire is secured to a clean metal surface on the trailer. In addition, each lamp/signal will also need to be grounded. Typically the lamp/signal is grounded through the mounting bolts having direct contact with the trailer frame. If the area that the lights are mounted to...
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  • Would the Tekonsha 7-Way Emulator Connector # 6562 Work on 2013 Ram Integrated Brake Controller
  • The Tekonsha 7-Way Trailer Emulator Blade Style Connector # 6562 that you referenced SHOULD work with the factory brake controller you have in your 2013 Ram 2500. However, we do know for a fact that this won't work on the 2009-2012 Dodge controllers Factory integrated brake controllers are sort of hit and miss in terms of compatibility with items such as the Tekonsha emulator, # 6562. It all depends on the power draw required to tell the integrated brake controller there is a trailer...
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  • Parts Needed to Install a Prodigy RF and 7-Way Connector to a 2013 Ford Escape
  • The Hopkins adapter # 37185 works great with the Prodigy RF wireless trailer brake controller # 90250. You will also need about 20 feet of 10 gauge wire # 10-1-1, and 40 AMP circuit breaker # PK54540. The Prodigy RF will need 12-volt circuit on a 7-way to work which is why you need the 10-gauge wire and circuit breaker. I recommend using dielectric grease between the two connection points to help keep down corrosion. The Edelman dielectric grease part number is # 11755 I have included...
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  • Will Hopkins Endurance Flex-Coil Trailer Connector Adapter Work With Heavy-Duty 4-Way Connector
  • If you have a round 4-way connector, the Hopkins Endurance Flex-Coil Trailer Connector Adapter w/ Nite-Glow, part # HM47043, should work just fine. This adapter plugs into a 7-pole blade-style connector for use with a 4-wire round connector on your towed vehicle. This also has a Nite-Glow feature so you can make your connections even in the dark. I have attached a video you can check out for this connector.
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  • Rental Trailer Caused Fuse to Blow Now Trailer Lights Won't Work After Replacing Fuse
  • It sounds like the rental trailer had a short and caused the fuse to blow. It could have actually caused more than one fuse to blow (or a relay if your vehicle also uses relays for the tow package wiring). Use the vehicle owner's manual to find all fuse and relay locations related to the tow package wiring to see if there is something else that needs to be replaced. To test the vehicle side trailer wiring you can follow the help article I have linked to the right.
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  • Troubleshooting Left Turn Trailer Taillight Not Functioning
  • Without knowing what vehicle you have or what trailer wiring harness you have installed on that vehicle it is pretty difficult for me to say what could be wrong, but since you checked the tow package fuses you have at least ruled that out as well as determined that the problem is most likely on the vehicle side. However, if you haven't already I would recommend you use a circuit tester like part # 3808 to verify that there is not voltage on the left turn/stop circuit when the left blinker...
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  • Trailer Wiring Recommendation for a 2015 Subaru WRX
  • I was able to track down the product review where a customer said he used the Tow Ready Wiring harness part # 119147 on a 2015 Subaru WRX and it worked well. However, since Tow Ready hasn't officially listed your vehicle as a fit for this wiring harness I cannot safely recommend it for you. I would wait till they release information on whether or not this harness has been confirmed to fit your vehicle.
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  • 2014 Mercedes Benz GLK 250 Bluetec Wiring Harness Recommendation
  • Although they are not specific to your 2014 Mercedes GLK-250 BlueTec I did attach a set of installation instructions for the Curt Wiring Harness part # C56190 that you referenced to the right that will give you a good idea on how to install it on your vehicle.
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  • Generator Recommendation for a Trailer with a Heater
  • A heater is going to draw enough amperage that you are going to want to use a generator to power it. Based on the usual amount of amperage that a heater will draw according to Powerhouse, (1,400 continuous watts), I would recommend the Powerhouse Professional Series 2000Wi 2,000-Watt Inverter Generator # PH60376.
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  • Troubleshooting 2005 Chevrolet Silverado 1500 7-Way Trailer Connector With No Power
  • Normally, the power wire for a 7-way connector will be coiled up and under the master cylinder if it is not attached already. It should be connected to the post located right by the STUD # 1. You will need to make sure there is a fuse in the STUD # 1 location as well. This should complete the power connection to your 7-way connector. You can use a circuit tester like part # 3808 to test the wire leading into the back of the connector on your 2005 Chevrolet Silverado 1500. If it is receiving...
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  • How to Make a 6-Way Round to 4-Way Round Trailer Connector Adapter
  • There isn't a 6-Way round to 4-Way round adapter that we carry but we have the parts to make one. First, a 6-Way is not very common, make sure it is a 6-Way, like # PK11609, and not a 7-Way blade style like # PK11893. If it is a 6-Way round then to make an adapter you would first need a 6-Way round trailer side connector, # PK11604. Then you would need a 4-Way round vehicle end connector, # PK11410. Then all you would need is about 1 foot of bonded 4-wire, # 16-4B-1. You would just...
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  • Troubleshooting Trailer Lights After Installing Hopkins Replacement 4-Way Connector # HM48192
  • The part you referenced, Hopkins Endurance Quick-Fix Replacement 4-Way Flat Trailer Connector # HM48192, has LEDs to indicate the presence of a signal. Since your connector's LEDs are lighting up this tells us that the signals from your tow vehicle 4-way connector are reaching the Hopkins connector. Since none of your trailer lights are working, the most likely explanation is a bad ground. Check the trailer's ground wire that connects to the trailer frame. This will typically be a white...
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  • Adding 5th Wheel/Gooseneck Trailer Wiring in the Bed of a 2015 Ford F-350 with 4-Way Flat Connector
  • To determine if you will be able to use the 5th Wheel adapter harness # 20140 you will need to follow the factory 4-Way back to where it plugs into another harness. If the plugs are round and match the picture I have included then you could use this adapter and you would still have full functionality of the bumper mounted 4-Way. But if you used this item you would have to then hardwire the blunt cut wires to the back of a vehicle side 7-Way. So if you do have the round connectors that...
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  • Brake Controller and Wiring Recommendation for a 2006 Ford Explorer with Factory 4-Way
  • What you will need to install a 7-way/4-way on your 2006 Ford Expedition would be the Hopkins Adapter part # 37185. Your current 4-way will plug into the 4-way of this adapter and will connect to the vehicle's tow package wires which are along the rear frame rail (if present). Check out the two picture I attached to determine if you have the tow package wiring on your vehicle plus the FAQ article I attached as well on installing a brake controller in a vehicle such as yours. If you...
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  • Best Option for Installing 7-Way Trailer Connector on 2008 Chevy Silverado 2500
  • If you're trying to install a 7-way trailer connector on your 2008 Silverado, look up above the spare tire or on the driver's side frame rail. You should see a wiring harness with a round plug on the end of it. The plug will have a protective cap on it. Once you remove the cap, you should be able to plug the harness into the rear of a 7-way connector like the part # HM40975, which provides both a 4-pole and a 7-way trailer connector.
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  • Are 8 Side Marker Lights on a Trailer Too Much Power Draw
  • The limit to the amount of lights you can connect to any given circuit on a trailer connector is up to several factors. Primarily it depends on what the vehicle side trailer wiring harness is rated for. If it is factory wiring then this information could be in the owners manual. If it is aftermarket then I would need to know the make and model of the harness and I might be able to determine what it is rated for. As long as the combined draw of all the lights on a given circuit are less...
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  • Towing Trailer with 5-Pole Flat Trailer Connector Using Vehicle with European 7-Way
  • We don't have an adapter available, but you can easily install a 5 pole connector to your vehicle using part # 119177KIT. The kit includes a circuit tester that you can use to probe the wires in the vehicle's taillight assemblies to determine which wire carries which circuit. The inputs of the converter would install as follows: Yellow wire to left turn signal circuit Green wire to right turn signal circuit White wire to ground Brown wire to running light circuit Blue wire to...
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  • How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
  • You are correct in your description of how to wire in a new auxiliary battery in your enclosed trailer. You will take the 7-Way's 12V power feed and route this to the positive terminal on the auxiliary battery, and you will ground the second battery to the trailer frame, as you described. You might refer to the linked article on trailer wiring to see the usual wiring configurations on trailer connectors. When the trailer is connected to the tow vehicle and you are running the engine...
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  • Troubleshooting Trailer Taillights that Stop Working When Brake Pedal is Depressed
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
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  • Troubleshooting a Brake Controller not Working When Used with a 7-way to 6-Way Adapter
  • A 6-Way trailer connector can be pinned in 2 different ways. The center pin can either be 12 volt power or trailer brakes. You will need to determine which way your trailer is wired up and then make sure the adapter you have is wired up the same way. This would explain the issues you are having with the brake controller not working. Next thing you will want to do is test the circuits of the 7-way with a circuit tester like part # 3808 to make sure all of the circuits are active. If so,...
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  • Troubleshooting Trailer Taillight Signals that Stop Working When the Running Lights are On
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
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  • Troubleshooting an LED Error Message on a 2015 BMW X5 When Towing Trailer
  • What it sounds like is going is that you are towing a trailer with your 2015 BMW X5 that has LED taillights and an error message is popping up on your dash. This is a common problem among BMW's. So much so there is a special adapter made to fix it. What you will need is the 7-Way to 5-Way and 4-Way Trailer Adapter # TR20141. This adapter will adapt the 7-way on your vehicle to a 4-way and has diodes installed in it so that your vehicle won't think there is a problem with the vehicle...
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  • 4-Way Trailer Wiring Harness Recommendation for a 2014 Ford C-Max
  • The recommended trailer wiring harness for your 2014 Ford C-Max is the Curt Harness part # 56146KIT. The local trailer rental place would have no problem at all installing this kit as I am sure they install similar harnesses on vehicles on a regular basis. There are instructions included with this kit that I attached to the right in a link as well as an install video. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with...
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  • Trailer Wiring Harness for a 2015 Audi Q5
  • Curt specifically lists trailer wiring harness # C56190 as the proper fit for the 2015 Audi Q5. Sometimes they will list more than one harness if they have determined they will fit and have tested it. In this case they do not list an alternative harness so I cannot recommend using kit # C56200KIT. If you go ahead with # C56190 you will also need wiring kit # 55151. The wiring process will basically be the same for either kit. The difference is that 56200 does not have a brown input...
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  • Adapting 2004 Porsche Cayenne 7-Way Trailer Connector to Trailer with 7-Way Rectangular Connector
  • We do not have a converter to go from a 7-Way blade-style trailer connector to a rectangular 7-Way. You will need to either change the connector on the 2004 Porsche Cayenne or the one on the trailer. The one on the trailer will be easier to change. You could use # H20042. The wire functions are as follows: White is ground Red is left turn/brake lights Brown is right turn/brake lights Green is running lights Blue is output to trailer brakes (not needed since the trailer does not...
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  • Where to Connect the Red Wire of a Brake Controller in a 1995 Ford F-150
  • For the red wire of your brake controller you will need to tap into the brake light switch of your 1995 Ford F-150. What you need to do is test the wires of the switch at the brake pedal to determine which of those wires sees voltage when the brakes are applied and none when released. That will be the circuit you attach the red wire of your brake controller to. The brake controller should still power on though without this connection being made. As long as the power wire (black) and...
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  • Trailer Wiring Harness Left Turn/Brake Light Circuit Keep Failing on a 2011 Hyundai Tucson
  • Since it sounds like this is a recurring problem it might indicate a problem on the trailer, specifically a short or overdraw situation that is causing the failure. The only reason I think this might be the case is because it is unlikely that 2 harnesses would fail in the same way. You will want to check the trailer wiring for any pinched or frayed wires that might be causing a short. Also make sure that the vehicle and trailer side connectors are clean and free of corrosion. Ultimately...
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  • Gauge of Wire that is Used on the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110
  • I spoke with my contact at Hopkins and they informed me that the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110 that you referenced has 16 gauge for the white (ground) wire and 18 gauge for the rest. For a 4-way that has all 16 gauge wire you would want the Wesbar 4-Pole Flat Connector # W787264.
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  • Comparing Pollak and Hopkins 7-Way Round Pin to 7-Way Blade Style Adapters
  • Both adapter # PK12-724 and # HM47425 plug into a 7-Way with round pins and provide a 7-Way blade style connector. They are made by different manufacturers but accomplish the same task. Pollak adapter # PK12-724 has a 1 year warranty whereas Hopkins adapter # HM47425 has a 90 day warranty.
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  • Can a 13-Way European Trailer Connector on a Volkswagen Amarok be Converted to US 4-Way Flat
  • The European 13-Way trailer connector does basically the same thing as the US 7-Way does except that the European version has a separate circuit and pin for every function. here in the states the turn signals and brake lights are combined on each side and there is just one running light circuit. In order to adapt the 13-Way you would need to determine which wires control brake lights, turn signals, and running lights on the 13-Way. Then you would take the left turn signal wire and attach...
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  • Wire Harness and Wire Gauge to Re-Wire Open Landscape Trailer
  • It is common for trailer wiring to use larger gauge wires for the ground, and sometimes electric brake and 12V power circuits, than for the lighting circuits (running lights and stop/turn signals) since these circuits demand more current flow. For typical trailers with electric brakes and 7-way RV-style connectors the wire gauges are usually 10-gauge for ground and 12-gauge for all others, such as with part # DW04914-1 from Deka. Even though you may not need all 7 wires at this time this...
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  • Finding a Reverse Light Wire to Tap Into on a 2014 Hyundai Santa Fe for Trailer with Surge Brakes
  • You will need to add a 4-Way to 7-Way adapter such as # 37185. The 4-Way will plug right into this adapter. Then you will ground the white wire to the frame. The blue wire you will not need since the trailer has a surge coupler. The black wire is for 12 volt power which you may or may not need. And the purple wire is for the reverse lights. There are a couple of possible places you can find access to the reverse light circuit. It is possible that there is a reverse light wire bundled...
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  • Recommended Solution to Extend a 7-Way to 7-Way Connector from a 2006 Lexus LX 470 to Pop Up Camper
  • The TorkLift wiring harness extension # TLW6028 will be a short term solution or if it's an occasional fix. The reason I say that is because it opens up possibilities of problems. These problems could result in becoming disconnected, additional connection points that could get dirt and grime in the connector to name a few. To avoid some issues associated with corrosion on the connection points you can use dielectric grease # 11755 or # LT37534 that seals out moisture and prevents corrosion....
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  • How to Find the Reverse Light Circuit for 5 Way Install on a Toyota Sienna 2014
  • I can help you figure out which wire you will need to use, but I do not know which color wire you would need. Since your reverse lights are in the rear hatch of your 2014 Toyota Sienna you will want to find test the wires that are in the rubber wire loom that should be at the top of the hatch between the door and the threshold for the door. In that loom there should be the circuit that has the reverse light circuit. Once you find it there you can then take apart the inside interior...
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  • Troubleshooting Trailer Running Lights Function on 2011 Porsche Cayenne Wiring Harness Install
  • The circuit that carries the stop/turn circuit is not the same circuit as the running light circuit. The circuit on the 4-way you have that has a brown wire leaving it is the running light circuit. You will need to test this circuit. If this circuit does not have voltage on it the problem is in the wiring of the harness most likely. You would want to review the install instruction I attached to the right to verify that it is installed correctly. If the voltage is there then the problem...
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  • Trailer Wiring Harness Recommendation for a 1981 Toyota Pick Up 4x4 and LED Trailer Lights
  • For your 1981 Toyota Pickup you will need to first determine whether or not you have combined or separate taillight circuits. Combined taillights are ones that the blinkers and brake lights are on the same circuit. Separate means the taillights circuits are on different bulbs. Which either way you would want the Curt Circuit Protected wiring harness part # 56146KIT. This harness can work on either taillight style, the only difference will be how you install the harness on your vehicle....
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  • Trailer Wiring Harness Recommendation for a 1994 Jeep Grand Cherokee
  • I checked with Tow Ready and the recommended trailer wiring harness for your 1994 Jeep Grand Cherokee is the part # 118349. However, the connectors of this kit have 6 pins. Which either means it wouldn't work for your vehicle or you have found the wrong harness to use for installing trailer wiring. Another option would be to use a universal wiring harness for installing trailer wiring. For that you would want to use the part # 119190KIT. This will require you to test the taillight wiring...
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  • No Power from Ford Brake Controller to 7-Way Trailer Connector on 2010 Ford F-150
  • I think this might be the ultra-rare Ford dummy harness issue. A few years ago I had a customer with a similar problem. It took days of troubleshooting and a savvy Ford tech at a dealership to determine that the harness behind the dash that the controller plugs into was not a complete harness so that could be what is going on. Ford would have to provide the harness. If you have the correct harness, which is likely given how rare this issue is, then it could be another problem with bent...
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  • No Power to 7-Way Trailer Connector on a 2004 Ford F-150
  • It sounds like a possible tow package fuse has blown on your 2004 Ford F-150. You will want to use the truck owners manual to find the locations of all fuses/relays associated with the tow package wiring to check them. The 12 volt pin on a 7-Way does not affect the regular trailer lights and the fact that everything stopped working with the interior lights is what makes me think the issue is related to the tow package fuses (specifically the one that controls the 12 volt circuit on the...
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  • Is Optronics 20 Foot Wishbone Wiring Harness Long Enough to Wire an 8 X 10 Foot Trailer
  • I spoke with my contact at Optronics about the Wishbone 4-Way Trailer Wiring Harness, # A20WB and she said the harness is actually 20 foot in total length, so you will have almost 10 feet of wire to spare when you update your 8 x 10 foot snowmobile trailer. I have included a video review of this wiring harness for you to check out. We also offer a Wiring Installation kit that comes with several different connectors, electrical tape, a crimping tool, and numerous other parts, # HM51020.
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  • Replacing Trailer Wiring on a 2000 Jayco 17 Hybrid
  • It sounds like the best solution for you is to bypass the existing trailer wiring since you cannot locate the wiring that leads to the tail lights. You can use wiring # 16-4B-1. It is sold in increments of 1 foot. So if you needed 20 feet you would enter 20 in the quantity box. Or you could replace the connector as well. If you have a 4-Way you could use # A35W42B which has 2 running light wires, one for each side of the trailer. If you do not have a 4-Way you could tell me the connector...
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  • No Brake Light Signal on 2000 Chevy Silverado Trailer Connector
  • If the 4 pole on the truck is factory installed, and you aren't getting any signal on the trailer connector when the brake pedal is pressed a blown fuse is the most likely culprit. Check the under-hood fuse box for a blown fuse. The lid of the fuse box should have a diagram on it that shows which fuse protects which circuit. If there is a blown fuse, it could have been caused by a short in the wiring of the trailer. Once the fuse is located and replaced, be sure to closely examine the...
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  • Extra Wire Needed When Installing Wiring Harness On 2014 Toyota Sienna
  • We do have videos of many of the items we offer, and take every opportunity to make videos as vehicles are brought in for an installation. We have not had the chance to get a video of an installation on the Tow Ready Modulite Power Converter Hardwire Kit, part # 119177KIT. There are times when installing a harness or any other electrical item in a vehicle, that you simply do not have enough wiring to reach some of the areas you need. Typically if it is a ground wire or a brake wire...
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  • Powered Converter Recommendation for 1982 Volkswagen Vanagon
  • The Hopkins Active Taillight Converter with Install Kit, # 46255, will work on your 1982 Volkswagen Vanagon but I highly recommend going with the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, # 119190KIT. This is the harness that we frequently install on the European vehicles that come into our shop due to the fact that it is a heavy duty wiring harness. The Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, # 119190KIT, with short circuit...
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  • Wiring Replacement 5-Pole Trailer Connector on 2012 Ranger Trailer
  • You can use a standard 5-pole trailer connector, you'll just need to wire it a certain way. The # HM47900 you referenced is the vehicle side connector, you need the trailer side connector like part # HM47910, which would wire as shown in the provided photo. The red wire you mention is for the reverse lockout on the trailer coupler, and is tied in with the reverse lamp circuit of the vehicle. Both brown wires would connect to the brown wire of the trailer connector. The yellow and green...
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  • How Does the Tow Ready Custom Fit Vehicle Wiring # 119179KIT Wire to a Vehicle
  • To install the Upgraded Circuit Protected Modulite with 4 Pole Harness and Hardwire Kit # 119179KIT on your vehicle you will first need to determine what taillight style you have, combined or separate. Combined taillights mean that the blinkers and stoplights are on the same bulb. Separate means that the brake lights are on a separate bulb from the turn signals. If you have amber turn signals then most likely you have separate. If you have combined you will need to ground the red...
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  • Towing Motorcycle Trailer with Bike and Truck
  • If the lamps on the trailer are incandescent, I have a solution for you. Trailers towed behind motorcycles are usually wired differently from those pulled behind vehicles. A motorcycle trailer will usually have separate turn signal and brake lamps, amber lenses over the turn signal bulbs or amber bulbs are the dead giveaway for this. What you'll want to do is wire the trailer in such a way that it'll work when being towed by either vehicle. I'd use a vehicle to vehicle taillight...
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  • Will Hopkins Heavy-Duty Trailer 7-Way to 4-Wire Adapter # HM47065 Activate Brakes on Trailer
  • The Hopkins Heavy-Duty Trailer 7-Way to 4-Wire Adapter # HM47065 is intended to plug in to a tow vehicle 7-way socket, take its lighting signals only (not a brake signal or 12V power) and route them to the 4-pole flat connector. When an adapter reduces the number of wires it also reduces the number of electrical circuits and therefore the number of functions. A trailer with electric brakes will need to have at least a 5-pole wiring harness (one more wire to provide one more function)...
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  • Trailer Wiring Installation on 1999 Ford E450 Van
  • If you're speaking of the video showing the # 119178 being installed on a 1999 Ford Van (see link), the harness is wired into the vehicle side of the van, closer to the front of the vehicle. The vehicle being wired in the video had a 'separate' taillight system, meaning that the turn signal and brake lamp are combined on the same circuit. You can quickly tell if your vehicle has this type of system by looking at the taillights. If the turn signals use a separate amber bulb or there's an...
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  • How Much of Each Gauge of Wire Fit Inside a Wire Loom Comfortably
  • I would certainly recommend the 1/2-inch wire loom # 459075-1. It will hold two jacketed 2 wire 10-gauge wire and three jacketed 2 wire 12-gauge wire. See pictures to the right. In addition, I was able to fit comfortably eleven individual 16-gauge wire # DW02359-1 into the 1/2-inch wire loom. I also took a digital caliper to measure the exact radius of each type of wire: 10-gauge is .17 of an inch, 12-gauge is .14 of an inch and 16-gauge is .09 of an inch. The 10, 12 and 16-gauge...
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  • Trailer Lights Work On One Vehicle But Not Another
  • It sounds like the problem is either on the connector or on your VW. First, you will need to have someone help you test your connector. Using a circuit tester like part # 3808, you will want to test each pin on the vehicle connector for function to make sure you are receiving a signal. Check for any corrosion in the harness. Any corrosion can cause problems on a wiring circuit. Make sure the ground wire is securely fastened to a clean, bare metal surface. If everything checks...
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  • Troubleshooting Trailer Wiring Harness that Shorts Out Running Light Circuit when Connected
  • If when your trailer harness is installed (correctly) it causes fuses to blow and prevents your left blinker from functioning it would be safe to assume that the harness is bad and needs to be replaced. You might double check that all of the connections were made solidly and there wasn't any exposed wire shorting out at all. I attached an FAQ on troubleshooting 4-ways plus a video on how to test them although it sounds like your harness has already been determined to be shorted out. Most...
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  • Vehicle Side 4-Way Trailer Connector Plug-in Circuit Tester Lights Light Up when Connected
  • If the lights on a 4-Way trailer connector tester such as # I26 or # 30512 light up when connected that means that those circuits are receiving power. It doesn't take much power to light up these small LED lights so even residual current could set them off. This is typically more likely on aftermarket installed trailer wiring harnesses that have a connection to the battery to power the trailer lights. It could also indicate a short circuit if the lights stay on all the time. The likely...
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  • Troubleshooting a 2003 Ford Ranger and Camper with Weak Trailer Brakes
  • The only way your brakes would have been locking up immediately when the brakes were applied would be is if the brake light circuit was shorting out to the brake output circuit on your trailer connector. Corrosion on the connector or exposed wire can sometimes cause this. $700 is an insane price for a new brake controller and trailer wiring connector. Did the brakes begin to function again after they worked on the truck/trailer? Weak trailer brakes can be caused by brake assemblies being...
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  • 4-Way Flat Male to 4-Way Round Female Adapter Recommendation
  • We do not have an adapter in that exact configuration for you, but we do have the parts to make your own adapter. You could use the Pollack # PK11410 and the Hopkins Endurance 4-way Flat Trailer connector # HM48110. You would just wire the Hopkins 4-way flat to the Pollack 4-way round connection point.
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  • Installing 4-Pole Modulite # 119190KIT on 2012 Mercedes-Benz E 350 Wagon
  • Tow Ready hasn't determined if the # 119190KIT is compatible with the 2012 Mercedes-Benz E350, which is why we recommend seeing the dealer for trailer wiring. If you wish, you can use a circuit tester like # 40376, and probe the wiring harnesses feeding the taillight assemblies while a helper activates each lighting function. This will help you determine which function each wire carries. Most likely, it's a BM1 or a BM2, but you'll need to confirm that for yourself. This being said,...
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  • Installing 7-way Trailer Connector and Brake Controller on 1995 Cadillac Fleetwood
  • We do indeed have an adapter that will convert a 4 or a 5-pole connector to a 7-way, part # 37185. However, your travel trailer will likely have electric brakes, and to actuate them you'll need to install a brake controller like the Tekonsha Primus, part # TK90160. To install the controller, we offer an installation kit, part # ETBC7. The kit incudes everything needed to install a controller, including the 37185 adapter I mentioned above. I'll link you to the instructions for the...
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  • Replacement 4-Way Flat Trailer End Connector for Current Connector with 5 Wires
  • I recommend replacing your current connector with the Hopkins Endurance 4-Way Flat Trailer Connector, # HM48110. You will just need to cut off the connector on your wishbone style wiring harness and replace it with the # HM48110. A wishbone style harness contains 5 wires because it uses two tail light wires from the connector for each side of the trailer. In this case you will just need to connect the brown wire to both taillight wires, the yellow wire to the left turn/brake wire, the...
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  • 5-Way Adapter Recommendation for a 2008 Ford Explorer Sport Trac
  • Your 2008 Ford Explorer Sport Trac should come with a 4-way already installed. All you would need to convert it to a 5-way would be a # 20036. Next you will need to do is figure out where to run the fifth (blue) wire of the # 20036. Most likely this wire is used for a reverse lockout for surge brakes, or reverse lights. If this is the case you will need to tap into the reverse light circuit of your Soul using the included quick-splice. I attached an installation video for the # 20036...
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  • Hitch and Wiring Recommendation for a 2012 Chevy Volt
  • Since the 2012 Chevy Volt is not typically used as a tow vehicle there hasn't been much of a demand for a t-connector style trailer wiring harness. As of right now, and for the foreseeable future, the only wiring option you have would be a universal install harness like the part # 56146KIT. For a hitch you would want part # C11221. Ball Mount part # C45521, 1-7/8 inch ball # A-80. Lastly, check your owners manual to see if there are any restrictions on towing with your vehicle.
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  • 4-Way Recommendation for a Motorhome and Adapter Recommendation to Tow a Motorcycle Trailer
  • Like most motorcycle trailers your trailer uses separate turn signals. Meaning the turn signals and the brake lights are on different bulbs/circuits. To install a 4-way on your motorhome you will want the part # 119190KIT. This is a universal kit that will work well but will require you to test your motorhome's taillights for function. Now to install a 4-way on your motorcycle trailer you will need two thing. First you will need a vehicle to vehicle tail light converter, the Tow Ready...
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  • Troubleshooting Trailer Wiring that the Turn Signals Activate with Blinkers
  • The issue you are experiencing is due to the fact that your trailer has separate trailer wiring circuits, meaning the turn signals and the brake lights are on separate bulbs and the trailer wiring harness # 56146KIT you installed is designed to operate combined trailer taillights, meaning the turn signals and brake lights are on the same bulb. What you are going to need to do is install the taillight signal converter part # 118158 on the wiring of your trailer. Once installed the red...
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  • Solution for Land Rover LR4 that won't Recognize Trailer with LED Taillights
  • We have a similar product as the one you referenced, part # TR20141. This product works on most German vehicles that have a hard time detecting trailers with LED taillights. I would normally recommend this for a situation like yours. But we have had feedback with other Land Rover owners who have reported that this product did not work with their trailer with LED taillights. The best recommendation I could make for you would be to replace the LED taillights of your trailer with incandescent...
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  • Running Lights Continually Blowing A Fuse on Trailer
  • Chances are the running lights are drawing too much current. It's possible but unlikely that LED lights would overload the harness. You may simply have more running lights on your trailer than your car tail light circuit can handle. The best way to correct this is to remove some of the running lights or use a powered trailer harness like part # 119179 or part # 119190. I recommend closely examining the running lamp circuit on your trailer, look for any pinched wires or wire with nicked,...
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  • Availability of Trailer Hitch of 2011 BMW 328i Coupe
  • There are hitches available for the 2011 BMW 328i, but they are all designed for the sedan and wagon models, and wouldn't fit the coupe model. If you were wanting to carry bikes, you could carry up to two using a trunk mounted bike carrier. The Thule Raceway 2 bike model, part # TH9001XT is without a doubt the easiest rack to install and remove. Rather than using the cumbersome buckle and strap arrangement used by other racks, the Raceway uses 4 cables that can tighten with the twist...
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  • TM Light Stays Lit On Curt Adapter 4 Pole To 7 Pole And 4 Pole With Test Lamps
  • I spoke with my contact at Curt about the Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps, part # C57674. They told me that if the vehicle has running lights as so many later model vehicles do, the TM test light will show there is current by lighting up. it sounds as though it is working just fine for you.
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  • Applying Brakes Causes Taillights of Trailer Towed By 2001 GMC Sierra to Malfunction
  • Things seem to work okay until you apply the vehicle brakes, is that correct? If so, it sounds like a poor ground connection. Make sure the white wire from your trailer connector grounds to the trailer frame (usually on the trailer tongue). Make sure this connection is secure and not corroded. Check the ground for each trailer lamp, as well. Each lamp should ground either through its mounting studs being in direct contact with the trailer frame, or by its own ground wire connected to the...
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  • Availability of Trailer Wiring Harness for 2012 Mercedes-Benz M-Class
  • None of our wiring suppliers offers a trailer wiring harness that is compatible with the electrical system in your 2012 Mercedes-Benz M-Class. You will likely have better luck checking with your Mercedes-Benz dealership for a wiring harness that will fit your vehicle.
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  • 4-Way Flat Harness Recommendation For Boat Trailer To Match Truck Harness
  • My best recommendation would be to replace the 4-way round connector on your boat trailer with a new harness like the Hopkins Endurance 4-Way Flat Trailer Connector, part # HM48110. This harness has 12 inch wires and will give you the male pin connector you said you needed. The wiring configuration is as follows: Yellow - left turn and brake Green - right turn and brake Brown - tail White - ground For butt connectors to attach the new harness I recommend part # 05731-5. This...
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  • Cost Effective Solution for Fixing Trailer Wiring Harness on a 2006 Dodge Ram 1500
  • What I would do in your situation is install the # 119190 and not mess with paying a ridiculous amount of money to have your TIPM replaced or reflashed. This harness will bypass all that nonsense and will give you a 4-way harness. If you are looking to use a 7-way trailer harness what you could do is cut the 4-way off of the # 119190, and then cut the harness of your factory 7-way and wire up the wires of the 4-way to the correct pin locations on your 7-way. For a wiring diagram check...
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  • Best 7-Way Trailer Connector Extension for a 1996 Ford Super Duty
  • It sounds like you are looking for an extension for the factory 7-Way on your truck to add in-bed wiring. We do have 1 option that would work but it is 7 feet long. If you can work with that it is # 20027.
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  • Troubleshooting Trailer Tail Lights That Blink Together and Shut off When Brakes are Applied
  • The first thing you will want to do is test the 4-way of the tow vehicle that you installed with a circuit tester like part # 3808. See the video I attached to see how this is done. This will tell you if the problem is on the vehicle side or trailer side of the wiring. If the problem is on the tow vehicle then you will want to check the back of the connector for cut or exposed wire that could be causing a short and fix as necessary. If the problem appears to be on the trailer the...
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  • Tracking Down Possible Poor Ground Connection on Travel Trailer
  • What you're describing is the classic symptom of a poor ground connection somewhere in your trailer lighting system. When all the functions are being used, you're drawing maximum amperage through the system, which is when a ground problem will manifest itself. Trace the white ground wire back from the trailer connector. The wire will usually ground to the trailer frame somewhere on the trailer tongue. Make sure this connection is secure and not corroded. Each trailer lamp will also have...
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  • Will Optronics 7-Way To 5-Way Adapter Replace Pollak Adapter
  • You will want to check the style pins on your adapter you currently have to make sure you get the correct style. The Optronics 7 Pole to 5 Pole Flat Wired Adapter, part # A57WB, is designed to fit a blade-style connector. The adapter converts a 7-way connector and gives you a 5-way flat connector, and is 16 inches long.
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  • Is Installation Of Wiring Harness On 2013 Volkswagen Tiguan Difficult
  • The wiring kit we offer for your 2013 Volkswagen Tiguan, is the Tow Ready Custom Fit Vehicle Wiring, part # 119190KIT. The instructions included are pretty clear, so if you take your time, I am certain this is a task you can tackle. I have attached a link to an installation video for this harness on a 2009 Tiguan. Although it may be a different year, the installation should be quite similar. This kit includes the wire tester, which is invaluable when installing wiring. It lets you...
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  • How Does the Tow Ready Wiring Harness part # 119179KIT Install on a 2008 Chevy Malibu
  • Since you have determined that your 2008 Chevy Malibu has a 2 wire (combined) taillight system you will need to ground both the red and the white wire of the # install harness part # 119179KIT. Aside from that you will install the brown wire of the harness to your taillight circuit, the green to your right stop/turn, and the yellow to your left stop/turn. The brown wire you found on your vehicle taillights shouldn't be carrying both your turn signal circuits and your running light circuits...
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  • Trailer Wiring Harness for 2014 Nissan Armada
  • Because it would be tapped directly into the wiring harness feeding the taillight assemblies, the Curt # 56146KIT you referred to would work just fine. No relays would be necessary, and the 4-pole trailer connector provided by the wiring harness would indeed provide you with right and left turn, along with brake and running lights. If all you were needing was the 4-pole trailer connector, once installing the # 56146KIT you'd be good to go. If you were needing a 7-way, you'd install the...
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  • Where is the Ground Wire on a 7-Way Trailer Connector on a 2002 Ford F-350
  • If you are looking at the back of the trailer connector on your 2002 Ford F-350 where the wires attach then the ground wire is in the 5 oclock position. On the trailer side the ground wire would be in the 7 oclock position. It might be difficult to determine where the ground wire terminates on the vehicle. If all else fails you could attach a new ground wire in that location and attach it nearby to a clean and corrosion free bare metal surface on the frame.
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  • Troubleshooting Blinking LED Trailer Lights with 2012 Range Rover Westminister Tow Vehicle
  • When most vehicles have a difficult time detecting a trailer being connected that has LED taillights we recommend the part # TR20141 that you have referenced. However, we have had several customers try this product on Range Rovers and reported that this did not fix the problem, or in other situations cause fuses to blow. In light of that, your best option would be to replace the LED lights on your trailer with incandescents. To see all of the incandescent trailer lights we offer check...
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  • Installation of a Tekonsha Primus IQ brake controller on Toyota FJ Cruiser 2007
  • Sounds like you did find the correct wire to use for the stoplight switch for installing a brake controller on your 2007 Toyota FJ Cruiser. It can be difficult using a quick splice for a thicker gauge wire on a thinner wire like the 16 or 18 gauge wire on your vehicle. What you could do is strip back a section of the wire on the brake switch and then solder the connection. Soldering connections is often times the more recommended method anyway. What I like to do to strip back thin wire...
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  • Electric Brakes Not Working when with Factory Brake Controller on 2013 Silverado and 2014 Yukon
  • Since we know that the trailer brakes do work since they work with your 2011 Ford F-150, the issue must be with the factory brake controllers in the 2013 Silverado and 2014 GMC Yukon XL Denali. The fact that they are GM vehicles is a clue. Sometimes, for whatever reason, GM will not make the tow package fully functional at the factory. You would have to make some connections under the hood. Even though I have not heard of this being an issue on models with factory installed brake controllers,...
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  • 2014 and 2013 Chevy Silverado 2500HD Crewcab Third Brake Light Replacement Recommendation
  • Yes, the 2013 and 2014 Chevy Silverado 2500HD have the same third brake lights. We have two products that would work on either vehicle, both are LEDs. For a smoked lens you would want part # P920289 and for a clear lens you would want part # P900289.
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  • When Trailer Connected to 2002 Ford F-350 Trailer Lights Do Not Work
  • This sounds partially like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. Even if the pins in the connectors are clean, corrosion can build...
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  • No Trailer Brake Signal on Factory 7-Way Using Prodigy P2 Brake Controller on 2003 F-250
  • Given the 11-year-old age of your vehicle (and presumably its 7-way factory-installed trailer connector) the issue you are having with no brake signal at the brake circuit pin on the 7-way could be a result of a corroded or damaged 7-way. You can use # HM40975 as a replacement for a factory 7-way. First I suggest you carefully inspect both sides of the F-250's 7-way looking for any signs of damaged wire, worn insulation or even slight greenish or whitish discoloration. Corrosion does...
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