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Expert Answers about Wiring


  • Troubleshooting Wiring On Truck And Trailer That Keeps Blowing Fuses When Connected
  • It sounds like you have a short in the trailer wiring. You will need a circuit tester like part # 3808 and test each of the pins on the trailer connector with the trailer disconnected. have someone run through all of the functions while you test each pin. If that checks out move on to the trailer. Visibly check the trailer connector for any signs of corrosion or damage. Then use a 12V battery and test the trailer without being attached to the truck. You may have a broken or loose wire...
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  • How to Make 6-Way Square to 7-Way Adapter
  • To make a 7-way to 6-way square adapter will require you to get the part # 37995 to use the 6-way end and then wire up a 7-way to it like part # H20043. This will give you the adapter you would need since there isn't one already pre-made.
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  • Can a Trailer Battery Get Charged by a 12 Volt Accessory Circuit from a 7-Way
  • Yes, what you are interested in doing is something that is very common for people who have powered jacks on their trailer. You should note that a wire ran from the 12 volt circuit of the 7-way will only put a maintenance charge on the battery and would not charge a dead battery. But if the battery has a good charge on you will be able to keep the battery going for as long as possible between charges with this method. You would want to run 10 gauge wire from the 7-way to the battery like...
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  • Troubleshooting Common Trailer Wiring Issues on 2004 Chevy Suburban & 2006 Cadillac Escalade
  • That's a tough one, indeed. Usually we can isolate the cause for a wiring problem by substituting an alternate vehicle or trailer. My initial suspicion is that both vehicles have a ground problem. A weak ground will allow some lighting functions to work while others may not. I suggest you check the white ground wire for each vehicle's wiring harness to ensure these are tightly affixed to a clean bare metal spot on the frame. If the grounding points are rusty/greasy clean and sand them...
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  • Wiring Recommendation for the Pollak Metal 7-Pole # PK12703
  • For the Pollak Metal 7-Pole # PK12703 there isn't a harness that plugs into the back of it, but we do offer a jacketed 7-way wiring harness by the foot. For that you would want the part # DW04914-1. It's sold by the foot so you would need to order a quantity of it in the length you need.
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  • Any Special Requirements to Install Trailer Wiring on a 2015 GMC Sierra with Day Time Running Lights
  • No, there is nothing special you have to do to add a trailer wiring connector to your 2015 GMC Sierra with day time running lights. The tow package wiring on the vehicle is independent of the day time running light circuit whether you have the factory 7-Way or want to install a different one such as # HM40975.
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  • 7-Way and Brake Controller Recommendation for 2006 Nissan Titan
  • The 7-way is the much more common trailer wiring connector associated with utility trailers. You will need to start with a 4-way (if you do not have one). For that you would want the # 119147KIT that you referenced. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as...
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  • Adapter for 2015 Audi Q5 to go From 7-Way to 4-Way
  • The 7-way you have on your trailer is most likely a 7-way blade style connector so you would need the part # 47345. If you happened to have a 7-way round pin connector instead the adapter you would need is the part # 118709. The adapter you referenced is designed for Euro style connectors which wouldn't be what you have.
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  • Can the 4-Way and 5-Way of the Reese Trailer Connector Adapter # 78118 be Used at Same Time
  • Yes, both the 5-way and the 4-ways of the Reese Trailer Connector Adapter # 78118 could be used at the same time. Since a 4-way can plug into the 5-way you could use both of your 4-way connectors. You would need to also be sure not to overdraw the taillight circuits of the vehicle's wiring. Powering two sets of trailer lights may be too much for the adapter.
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  • 4-Way to 7-Way Adapter Recommendation for Jeep Wrangler for Charging Trailer Battery
  • The part # 30717 would be exactly what you would need to start with to install a 7-way on your Jeep Wrangler that has a 4-way. You would need to ground the white wire and then run the black wire up to the positive post of the battery using 10 gauge wire like part # 10-1-1 (sold by the foot) through a breaker like part # 9510. If parked for a short period of time your vehicle battery would not get drained but if you planned to park it over night and your trailer battery was pretty weak...
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  • Would Trailer Emulator part # 6562 Help Troubleshoot Open Ground on P3 Brake Controller
  • You can use the emulator part # 6562 to help narrow down where the problem is. If the controller shows a normal brake controller connection when it is plugged in then you know the problem is on the trailer side. If the problem persists you know the problem is on the trailer side. The owner's manual for the Tekonsha Prodigy P3 states 4 possible causes of a "NO Trailer Connection!" warning: the trailer is not connected to the tow vehicle, the trailer is connected with an open circuit on...
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  • Trailer Brake and Turn Signals Not Working when 2012 GMC Sierra Running Lights are On
  • This sounds like a ground or a short. 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 but can show up any time. 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...
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  • Trailer Wiring Harness for a 2008 Jeep Commander
  • You will have to convert the separate circuits on the vehicle to be able to work with the combined circuits on the trailer. On the trailer, the left and right turn signals also have the brake light functions. Many vehicles have separate amber turn signals so a converter is required to combine the circuits. There are harnesses for your 2008 Jeep Commander that do not require any hardwiring, such as # 118408. But if you prefer to hardwire in a converter you can use # 119178KIT. On 119178KIT...
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  • How to Find Which Wires to Use to Install Trailer Wiring in a 2002 Ford Crown Victoria
  • I wish we had specific info on how to wire the part # 119179KIT to your 2002 Ford Crown Victoria but all we can recommend is to test the wiring like what you see in the install video I attached to identify the wiring functions of the taillight harness so that you can wire up the harness properly.
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  • Best Trailer Hitch and Wiring Harness Option for a 2016 Mazda CX-9
  • For your 2016 Mazda CX-9 I recommend installing the Tekonsha Vehicle Wiring Harness Kit with 4 Pole Trailer Connector # 119147KIT. Tekonsha is a popular and reliable brand. Since you don't have a trailer hitch receiver you most likely do not have a tow package. However, vehicles with a factory tow package would use the T-One Vehicle Wiring Harness 4-Pole Flat Trailer Connector # 118278. For a quality and cost effective trailer hitch receiver I would go with the Draw-Tite - Class...
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  • 7-Way Wiring Harness Recommendation for Use with Pollak Heavy-Duty, 7-Pole
  • We have a jacketed 7-way wiring sold by the foot. For that you would want the part # DW04914-1. Just order the quantity of the harness in the amount of feet that you need. It would wire right up to the terminals at the back of the connector part # pk11720.
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  • Interior Horse Trailer Lights No Longer Working
  • There is a fuse that runs the trailer connection on your 2014 Ram 3500. I looked at an online owner's manual for your vehicle to determine fuse locations and functions and I would check the fuse located at F30 first. If this fuse isn't blown, try F87. If both are fine, the problem is likely not a fuse. It's possible that the 12V auxiliary power is on the center pole, although depending on your connector that's not always the case. So when testing you'll want to check the other blades...
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  • Replacement 5-Way Recommendation for Trailer to Match 5-Way of Motorcycle
  • You will have to cut off the 5 round on your trailer and wire a 5-flat to it instead so that it will match your motorcycle. For that you would need the part # HM47910.
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  • Replacement Brake Controller Recommendation for Faulty Controller
  • If all of the wiring of the controller is good and you know the trailer side of the wiring is good as well (since you tested it with the breakaway), the controller would be at fault and would need to be replaced. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional brake controller that senses the amount of braking the tow vehicle...
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  • Does Ground Wire of the Curt 7-Way Adapter part # C57674 Need to Be Grounded
  • If you are concerned that your # C57674 isn't working properly first thing you should do is ground the white wire. Then use a circuit tester like part # 3808 to test the pins of the 4-way and 7-way of the adapter if the lights still aren't coming on. They should be working at this point but the circuit tester will be the final authority on whether or not the circuits are active. Since ground problems can be a headache I always recommend grounding the strap of the part # C57674.
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  • 7-Way Trailer Wiring Recommendation for a 2012 Nissan Pathfinder with 4-Way
  • If you wanted to install a 7-way on your 2012 Nissan Pathfinder you would want the Tekonsha 7-Way Kit part # 118266. Some of the components of the kit wouldn't be needed since you already have the 4-way but this will come with everything needed to complete the install. I attached an install video for you to check out as well.
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  • Availability of 4-Way Extension Harness for 2014 Toyota 4Runner
  • The part # HM47115 is a 48 inch (4 foot) long 4-way extension harness. Since you said the connector on your 2014 Toyota 4Runner was factory that leads me to believe you actually have a 4-way and not a 5-way. The LED light situation shouldn't be an issue either. The taillights of your trailer should already have a converter installed on them to separate out the combined signal of a 4-way. If not email me back with what setup you do have and I will do my best to help you.
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  • Is there a 7-Way Blade to 7-Way Round Pin Adapter that Also has a 4-Way Flat Receptacle
  • Hopkins adapter # HM40950 plugs in in place of a blade style 7-Way connector that uses the standard US car connector. It has a 4-Way and 7-Way blade style receptacles. So if you are looking for a 7-Way round pin this one would not work and you would have to remove the old 7-Way and replace it with this one. In order to keep your 7-Way and adapter to a 7-Pole round pin you can use # 47595. But it does not have a 4-Way. None of the 7 blade to 7 round pin adapters have a 4-Way included....
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  • 7-Way to 4-Way Trailer Wiring Adapter for a 2016 Chevy Express Van
  • If you are looking for a 7-way to 4-way wiring adapter then the part # PK12716 would be what you need. The 7-ways on vehicles like your 2016 Chevy Express are all made the exact same so this adapter would fit and work well.
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  • Troubleshooting Trailer Running Lights that Come On When Key of Vehicle is On
  • A short between the 12 volt accessory circuit on the 7-way and the running light circuit would cause the running lights on the trailer to come on. Typically the 12 volt circuit only sees voltage when the key is on. The running light pin and the 12 volt pins on a 7-way are also right next to each other which makes the short even more likely to happen. I attached a couple links to wiring help articles for you to check out as well.
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  • Trailer lights
  • It sounds like there is either fuses or relays blown on the truck or the trailer connector on the truck side has corrosion in or on it. Checking the fuses and relays is easy. Just locate the tow package fuses/relays using the owner's manual or the legends on the fuse panel lids (many vehicles have fuse panels in the cab as well). For a relay the easiest way to check for a bad one is to use a known good one in its place. Inspect the trailer connector and make sure it is clean and free...
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  • Locating the Brake Light Wire to Install a Trailer Wiring Harness on a 1991 Isuzu Trooper
  • The easiest way to determine which wire is the brake light wire on your 1991 Isuzu Trooper is to first identify the brake light bulb. Then test the wires going to that bulb with a circuit tester, such as # 3808 if you need one, while someone sits in the cab and steps on the brakes (to power that circuit). Another option is if the Trooper has a third, center brake light, to test those wires and tap into the brake wire there instead of at the tail lights.
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  • Can Curt Trailer/Brake Controller Tester Detect Voltage From 2016 GMC Sierra Brake Controller
  • The Curt trailer and brake controller wiring tester # C51498 detects voltage coming from a brake controller so provided that your factory brake controller in the 2016 GMC Sierra is putting out voltage it would detect it. But if all you needed to do was test for voltage you could use a circuit tester at the 7-Way trailer connector, # 3808, or a multimeter if you have one.
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  • Adding a 7-Way Trailer Connector to a Toyota 4Runner with a 4-Way
  • Yes. If the 7-Way is a blade style 7-Way, which is what is sounds like, you can mount # 37185 to your 4Runner. The 4-Way will plug into it (and still be functional) and then all you will have to do is ground the white wire to the vehicle frame. The other wires on 37185 do not have to be connected but this means that only the light functions will work on the trailer. If you need all the functions to work on the trailer then instead of # 37185 you will need # ETBC7 and a brake controller,...
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  • Best Tool to Check Ford Integrated Brake Control System
  • When looking to check an integrated brake control system for correct operation, I recommend using a Tekonsha 7-Way Trailer Emulator Blade Style Connector, # 6562. This tool has simple function codes to let you know what is working or not working in your system. I've attached some videos of this tool for you.
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  • Finding Third Brake Light Circuit for Camper Shell on 2009 Chevy Silverado
  • Typically near the 7-way wiring on Chevy trucks there is a dedicated third brake light circuit that is to be used for wiring up the third brake light of a camper shell. The main trailer wiring harness is located under the truck bed, usually above the spare tire. There is usually a socket for your trailer connector to plug into, but if you peel back the wire loom you will find a light blue wire further up in the wiring harness that is intended for use for a third brake lamp on a camper...
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  • Recommended Brake Controller To Replace OEM Brake Controller On 2015 Chevrolet Silverado
  • The issues you are having and the fact they are intermittent sounds like the brake controller has an internal issue. You can check the resistance to see if the system is operating correctly. Use a multimeter like part # BTMT15. Check the brake signal while someone applies the manual override. For one axle on your trailer(2 brakes) you should see about 2 ohms and for two axles(4 brakes) you should get about 1 ohm. If that checks out Have some one apply the brakes while barely moving...
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  • Recommended Wiring When Adding 7-Way Trailer Connector To 2016 Ford Escape
  • First, I would recommend using part # 37185 instead of the # C57674 you mentioned because the test lamps on the connector can cause issues with the Tekonsha Prodigy RF Wireless Trailer Brake Controller, part # 90250. The best way to run the system is to connect the black wire from the # 37185 directly to the positive battery post for your 12V power on the 7-way. This prevents any issues with power draw and possibly performance problems with the lights on the trailer. I have attached...
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  • Installation of Reverse Light Circuit on Trailer with 2013 Jeep Grand Cherokee with 4-way Connector
  • It sounds like you need the # 37185 wiring harness. This connector will adapt your 4-way wiring to a 7-way connection and the purple wire will connect to your reverse light connection on your vehicle to transmit the signal onto your trailer. You will need some 10 gauge wire to splice in this connection # DW02359-1 and # 804C. For any unused wires you will want to cap them off or secure them with electrical tape and zip tie them out of the way. Have a helper place the transmission...
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  • Wire Color Match to 4-Way Wiring with Epicord 7-Way Molded Trailer Plug 277-000141
  • Yes, you are correct about the install of the # 277-000141. The wiring colors you mentioned are correct except the blue wire is for brake output from a brake controller. You would want to run the black wire for both the lighting and a 12 volt auxiliary. Unless you wanted to run the same circuit on your tow vehicle up to the battery as well. The yellow wire you mentioned is reverse light typically.
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  • Trailer Running Lights Slowly Pulse On and Off and Rear Tail Lights Not Working w/Mercedes Sprinter
  • The tail lights on the back of a trailer run off of the running light circuit so the fact that the other lights on that circuit are working and most of the problems are just at the rear tail lights that makes me think there is a ground problem. 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 but can show up any time. Make sure that the vehicle side and trailer...
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  • Agricultural Type 7-Way Vehicle Socket for Trailers Using Round-Pin 7-Way Plugs
  • 7-way trailer connectors can be wired in several ways and heavy-duty commercial/agricultural round-pin 7-way wiring can be different too. Please refer to the linked image to see the different vehicle-side connectors and their common wiring configurations. To use your trailers that have plugs like # PK11702 with your F-250 you will need to install a socket such as # PK11720. A circuit tester like # 3808 will help you identify the function on each wire of the truck's existing 7-way. The...
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  • How to Order Everything Minus 7-Way Adapter of # ETBC7
  • We have a kit that includes everything that comes with the # ETBC7 minus the 7-way adapter that you already have. For that all you would need is the # 5506. Since it looks like you have a 2010 Ford Escape I attached an install video for the # ETBC7 on a similar 2011 Ford Escape. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional...
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  • Replacement 7-Way Recommendation for 2008 Chevy Tahoe
  • There is an easier solution for your 2005 Chevrolet Tahoe. You can use the OEM Style 7-Way and 4-Way Trailer Connectors for Ford and GM Trucks, item # HM40975, to install a 7-Way and 4-Way connector at the back of your vehicle. The connection point is located above the spare tire and simply plugs in to the HM40975. The mounting bracket is also included with this item, and the existing connector just plugs into the rear of the trailer connector. You would not need to hardwire in a 7-way.
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  • How to Wire up 4-Way to Trailer with Separate Turn Signals that Had 6-Way Square
  • What I would do in your situation is cut off the square connector and install a 4-Pole Trailer End Connector # 18004 instead. Since you have separate turn signals from stoplights on your trailer you would need to use a signal converter to allow this to work properly. Basically you would need to use the part # 118158 to convert the signal. You would wire it just like the box has instructions for matching up the signals on the left side to the 4-way and then on the right side to the...
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  • Which Curt Trailer Wiring Harness is a Confirmed Fit for a 2010 Audi Q5
  • Actually the Curt harness part # C56236 that you referenced is essentially the most recent version of the now discontinued C56200KIT. For your 2010 Audi Q5 the # C56236 is the recommended universal harness. The YouTube video you found that shows the older harness being installed on a 2010 Audi Q5 like yours would still work as a guide.
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  • Troubleshooting Wiring Gremlins on a 1966 Roadrunner Travel Trailer
  • A bad ground can cause all sorts of weird things to happen. You also have to be careful when wiring because there isn't really a standard wiring color/function code for trailers. If the 7-Way you bought had any wires attached to it then they won't necessarily match up to the white, brown, yellow, and green. For example on a trailer side 7-Way a lot of times there will be a red wire for left turn and brake lights, brown for right turn and brake lights, and green for running lights. It...
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  • Will a Curt Powered Trailer Wiring Harness Drain the Battery on a 2012 Toyota Prius
  • Some of the Curt powered converters such as # 56146 or # C56147 can have constant power going to the 4-Way connector. That power isn't going to drain the vehicle battery unless something is connected to the 4-Way and drawing power. The Tekonsha wiring harnesses ( # 118505 for the 2012 Toyota Prius (II, III, and IV)) do not have that same problem and would be a better option.
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  • Recommended Circuit Tester For Converter Box Wiring
  • There are a couple ways to test the wiring circuit but the testers we offer do require piercing the wire jacket so the probe can touch the actual wire. I spoke with one of our best installers and they told me you can use a bit of silicone to cover the wire where it was pierced and then use electrical tape to seal it off and prevent future corrosion or issues. Another way is to just sever the lines and use either butt connectors or shrink connectors when you have completed the testing....
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  • 7-Way Wiring Harness Recommendation for 2015 Ford F-150 with 4-Way
  • If your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # 22292 and the # 37185 and a brake controller. There will be a few connections you need to make under the rear of your truck that you can see in the install video and help article I attached but the # 22292 plugs in under the dash of your truck. For a brake controller I would recommend the Prodigy P2 Brake Controller...
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  • Options for Wiring in 7-Way to 2004 Chevy Silverado
  • Sounds like you wired in a 7-way to your 2004 Chevy Silverado. There should have been a socket there near the rear bumper that would allow a 7-way like the part # HM40975 to install without requiring you to splice anything. Your truck has separate taillights from the turn signals so it sounds like you wired the stop/turn circuit of the 7-way to just the turn signals of your truck. If you wanted to convert the signal of your truck to combined you would need to wire in the part # RM-732...
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  • Troubleshooting Vehicle and Trailer Lights When Towing with 2013 Nissan Armada
  • If your Armada behaves normally when the trailer is not connected, and all of the vehicle's lights work as they should, and the problem only occurs when you plug in the trailer then this tells us that it is likely the issue is in the wiring on your trailer. Something as simple as corrosion inside the trailer plug (or the vehicle socket) could easily cause issues with lighting circuits or the trailer brake circuit. If there is corrosion inside the connectors two different circuits could...
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  • Can a Red Wire be a Ground Wire in a 7-Way Trailer Connector
  • By process of elimination the red wire must be the ground. But while there are common wire colors used there isn't a standard so the red wire could technically serve any function (except that you noted that everything works). On a 7-Way the only circuit that won't have power at some point would be the ground. So if all the other wires show power when a function is on and that red wire doesn't then it has to be the ground. But it must already be grounded somewhere because if it wasn't...
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  • Signal Converter for Converting RV Separate Lights to Combined for Tow Bar Lighting
  • To convert your separate signal to combined so that your tow bar wiring functions properly you would need a taillight converter part # RM-732. This will put the stop and turn signals on the same wire so that the magnetic lights work properly.
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  • Recommended 7-Way Trailer Wiring Extension for Travel Trailer to Reach Bumper Plug on 1994 Chevy C/K
  • It sounds like you are looking for a way to extend your trailer's 7-way plug so it can reach the plug at the bumper of your truck. To do this you will want Hopkins part # H20044. You will want to wire this 6 foot long connection to your travel trailer by function, I have included a chart of the usual trailer wiring and functions to this page for you to reference. I have linked the above mentioned product to this page for your viewing and purchasing convenience.
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  • Adapter for 4-Way Trailer Connector to Connect to Trailer with 7-Way
  • All you would need is the part # 37185. You would plug your 4-way into the 4-way of this adapter and you would be good to go.
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  • How Does the Hopkins Trailer Connector Tester Display Connection Problems
  • The Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 does not light when there is an issue. The tester will display lights when the feature you are testing is sending a signal to the trailer as it should. I've attached a video that demonstrates how the connector is used to test the different features.
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  • Recommended Wiring and Brake Controller for a 2006 Nissan Titan without the Tow Package
  • For a 2006 Nissan Titan with no wiring done you will need to first install the 4-way wiring harness, I recommend the # 119147KIT, because we have had better luck with this brand versus the Curt. Next you will need to outfit your vehicle with a 7-way, this will allow you to use a brake controller for a trailer with brakes. The wiring of the 7-way allows for the correct brake signals to be transferred opposed to just the 4-way. For this I recommend the # ETBC7 adapter. This kit will...
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  • 7-Way Wiring Harness for 2013 Ram 1500
  • Yes, the Pollak 7-Pole and 4-Pole Trailer Connector # HM40975-11998 could be hardwired to your 2013 Ram 1500 but we do offer no-splicing direct plug-in 7-way 5th wheel harness kits like # PK11893-11932 that fits the Ram with factory 7-way. We also offer just a 7-way/4-pole socket, part # HM40975 that connects to a round U.S. Car connector. If your truck has neither a factory 7-way nor a 4-pole you can instead use 4-pole kit # 119179KIT and then add our # ETBC7 7-way kit. Together these...
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  • Parts Needed to Add 4-Way to Fifth Wheel Trailer for Towing Second Trailer
  • What you would need is the part # 18252. This is a 72 inch long 4-way connector that comes with quick-connects so that it can easily be attached to a trailer's taillight circuits. It would be just a matter of tapping all of the correct circuits for the wiring. Adding the 4-way to the vehicle would be pretty difficult and would require quite a bit of wiring.
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  • Adapter Availability to Go from 7-Way Round to 7-Way Blade
  • Sounds like you are either looking for the part # F77R which has a 7-way blade male and a 7-way female round connector or the part # PK12-724 which has 7-way round male and 7-way blade female.
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  • Recommended 7-Pole Round Plug & Play Wiring Harness Adapter for 2005 Ford Super Duty Factory Wiring
  • It sounds like your 2005 Ford Super Duty was outfitted with the 7-way blade system which is the most common in the market today. To adapt your 7-way blade to a 7-pole round for your trailer, I recommend the Pollack # PK12728. This 7-pole connector is prewired to simply plug into your truck's 7-way plug. It has the # PK11720 connector you referenced but is pre-wired like you are desiring. A great mounting bracket for the # PK12728 is the # PK11771. I have linked all the above...
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  • Availability of 4-Way Wishbone Wiring Harness with Shorter Wire Lead
  • The wishbone harness with the shortest amount of wire lead has 20 feet of wire and a 30 inch ground wire, the Optronics 20 Foot Wishbone 4-Way Trailer Wiring Harness # A20WB. I wish we had a shorter option for you but our manufacturers don't offer a wishbone harness with a shorter lead. I double checked with Optronics and the 20 ft lead is the shortest they offer with a wishbone harness. If you'd rather use a connector with a shorter lead, the connector with a lead closest to the 18...
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  • Can Group 24 and Group 27 batteries be Wired Together in Parallel
  • The group number that a battery belongs to refers to its casing size so you can use a group 24 and group 27 battery together.
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  • Recommended 4-Way And 7-Way Trailer Connector For 2011 Jeep Grand Cherokee With 4-Way
  • We have exactly what you are looking for. I recommend the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole, part # 37185. This plugs into the 4-way at the back of your Jeep and gives you a 4-way and 7-way. Depending on what you intend to use in the 7-way the other wires will need to be attached. The 4 wire functions are white for ground, blue for a brake controller if needed, black is the hot lead and used for a 12V power supply, and purple is an auxiliary. If any of these functions are...
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  • 7-Way Adapter Recommendation for 2016 Toyota Tacoma
  • If you have the 4-way harness part # C56282 installed on your 2016 Toyota Tacoma you could cut off the 4-way and wire it to the # HM40975-11998 if you wanted but an easier option would be to use the # 37185 in place of the Hopkins. It allows you to just plug the 4-ways together and then run the additional circuits as needed to give you a 7-way. If the goal is to install a brake controller you instead would wan the part # ETBC7 which also includes the 37185 but comes with everything...
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  • trailer lights
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • Replacement Vehicle 7-Way Recommendation that Uses Traditional Wire Colors
  • The Pollak part # HM40975-11998 is a replacement vehicle side 7-way that uses the traditional wire colors where the brown is taillight and green is right turn/stop. I couldn't agree more on how annoying it is that there is two different ways the 7-way wiring is ran and the difference is the brown and green wire colors are swapped. It had to have been a mistake somebody made in the early days of trailering that they just went with.
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  • Will Hopkins Endurance Multi-Tow 7-Way and 4-Way Trailer Connector Plug into a 2001 Chevy Tahoe
  • On your 2001 Chevy Tahoe look for a round connector which will look like # PK11998. If you find this connector at the back of the vehicle in the vicinity of the spare tire then yes, 7-Way connector # HM40950 will plug right in. If you find a bundle of wires without a plug then you will need to also use # PK11998 to hardwire into that wire bundle. The functions of the wires for PK11998 are: Red - Left Turn and Stop White - Ground Blue - Electric Brakes Green - Right Turn...
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  • Adding a 7-Way Trailer Connector to a 2016 Honda Pilot
  • If the 7-Way trailer connector on your 2016 Honda Pilot is the factory installed 7-Way then all of the functions, including the 12 volt power circuit, should be active. But on models that did not come with the factory harness the connection and wiring is there but may not be active. However, you will not have to hardwire in a 7-Way to your Pilot because you can use # 118274. It plugs into the factory connection point and includes the fuses and relays to make it active. I have linked...
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  • Solution for Trailer with 5-Way that Does not Match Pollak 5-Way PK11502
  • There are 5-way rounds like the part # PK11502 and there are 5-way flats like the # HM47900. I am not sure which you have tried but it sounds like your motorcycle uses a unique style of connector. Which if you have the # PK11502 already you could just replace what's on the trailer with the part # PK11501 and be set.
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  • Can Wire Larger than 10 Gauge be Used to Wire a Trailer
  • It depends on the connector and what it accepts. You usually don't see wiring larger than 10 gauge in use on a trailer because the larger the wire the harder it is to push electricity back on that wire. Automotive grade 10 gauge wire such as # 10-1-1 (sold by the foot) at a length of 20 feet can handle up to about 46 amps so it does a good job in that regard.
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  • Recommended Wiring Harness for 2005 Mercedes-Benz ML350 Special Edition with Factory Trailer Hitch
  • Don't worry, I can help outfit your 2005 Mercedes-Benz ML350. The wiring harness that I recommend for your 2-wire system is the # 119190KIT. I have linked the instructions for you to see how the 2-wire system your ML350 has will install. You mentioned the two wires as turn and brake light being separate but you did not mention the tail light wire, you could in fact have a 3-wire system which the # 119190KIT will also fit, best thing to do is to use the included tester for all the functions...
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  • How to Identify Functions for Each Wire on a Trailer
  • Trailer wiring often uses specific color wires for a particular lighting function but there is no guarantee that your trailer uses the common wire colors. This just means that you'll test the wires on the trailer to see what each one does; then you will know how to connect it. You can refer to the linked article on trailer wiring that shows the usual configurations of 4-pole, 5-pole, 6-pole and 7-way wiring. Photos are included to show you the usual wiring colors for each function. In...
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  • 4-Way Trailer Wiring Harness Recommendation to Add 4-Way to Rear of 5th Wheel for Second Trailer
  • What you would need is the part # 18252. This is a 72 inch long 4-way connector that comes with quick-disconnects so that it can easily be attached to a trailer's taillight circuits. It would be just a matter of tapping all of the correct circuits for the wiring.
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  • Trailer Wiring Recommendation for Motorhome to Allow Flat Towing Lighting to Connect
  • Does your motorhome have trailer wiring installed on it already? If so, you wouldn't need to add anything to it as it would already be converted properly. If not you would need the trailer wiring kit part # 119190KIT that would convert the separate signals to combined. Then to convert it to a 7-way you would need the part # 37185. For lighting on the tow vehicle you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into...
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  • Comparing Hopkins A75TB & Might Cords A10-7275VP 7-Way to 5-Flat Wiring Adapters
  • We have sold many of the Hopkins 7 Pole to 5 Pole Adapter # A75TB and more than 50 customers have reviewed it quite favorably, as you noted. It has nearly a perfect satisfaction rating. The similar Might Cords adapter # A10-7275VP is new enough that we do not yet have the customer feedback. If it were me I would spend the extra buck for the item with an established good track record.
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  • Trailer Wiring Adapter to Join Truck 7-Way with Trailer 4-Pole Connector
  • It sounds like your Durango has what we call a 7-way blade type trailer socket, which is shown in the linked photo. This common trailer connector uses flat or blade type contacts. We offer adapters to join this type of connector to the 4-pole you have on your trailer and you can see all on the linked page. For example, Pollak # PK12716 plugs in to your Durango's 7-way and provides a connection point for the trailer's 4-pole wiring harness. Others like the coiled-cable adapter # HM47065...
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  • Wiring Harness Recommendation For 2004 Ford Thunderbird With Low-Side-Switching
  • To be able to install a trailer connector on your 2004 Thunderbird you will need wiring like part # 36345 that is specifically designed for your wiring. This is a hardwire installation. We do not offer a plug-and-play option. I found that your Thunderbird has what is called 'low-side-switching'. When installing this harness you will need to use a circuit tester with reverse polarity. Unfortunately we do not offer these but you should be able to find that item at a local hardware store....
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  • 4-Pole Wiring Harness for 1998 Volvo V70 for Motorcycle Trailer Lights
  • We do offer 4-pole wiring harness kits for your 1998 Volvo V70 and these are all hard-wired types displayed on the linked page. These kits wire in to the leads at the Volvo's taillights. None of these is a plug-and-play option which might be available from a Volvo dealership, albeit at a premium price, IF it is available. Of the available options I suggest the reliable Tekonsha # 119147KIT for its combination of reasonable price and high 7.5-amp taillight circuit current capacity which...
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  • What Wire Gauge is Used for Pilot Plug-and-Go Trailer Wiring Extender # TC-500
  • I spoke with my contact at Pilot about Plug-and-Go Trailer Wiring Extender # TC-500 and he said that the wire gauge used is 16 gauge so you're good to go! I have also linked a video review for you.
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  • Causes For Blown Fuses On Tractor Trailer
  • There can be a couple reasons fuses keep blowing but most of the time it is a short caused by a broken or damaged wire shorting out on metal. I recommend inspecting the wiring on the trailer and the truck to make sure all of the wires are intact and have not been damaged. Another reason may be if you added trailer lights and they are just simply drawing too much power. That can also cause the blown fuses.
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  • Diagram that Matches Pin Out of Bargman 7-Way, RV-Style Connector w/ 8' Long Coiled Cable
  • The wires of the connector on the part # 54006-044 are sealed and there isn't a way to remove them. If you check out the diagram I attached you can see how the pins o the connector are organized.
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  • Wiring Up a New 7-Way on Vehicle that Uses Non-Standard Wire Colors
  • I wish all trailer wiring harnesses used the same colors but unfortunately they don't and in your case the only solution is to test each of the wires with a circuit tester like part # 3808 to determine it's function and then wire it to the chart I attached by function.
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  • Which Pin of a 7-Way Will Have Power All of the Time
  • On a trailer 7-way the pin in the 1:00 position is the 12 volt accessory circuit that would have 12 volts of power all the time. I am not sure exactly what you mean by # 4 but I attached a picture of a 7-way diagram that shows what all of the pins are for.
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  • Recommendation of 7-Way to 7-Blade and 4-Pole Wiring Harness on an RV
  • The Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185 can be a solution for you. But we don't carry an adapter to plug into your RVs existing 7-way trailer connector to give you both of the connectors you want. On the Hopkins adapter, the 4-Way plug isn't going to just plug into your RV so you're going to need to cut the 4-flat end of it off. Then you'll also cut off the 7-Way that's currently on the RV. After that you'll essentially wire the Hopkins adapter and the wiring on your...
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  • Troubleshooting 4-Pole Trailer Wiring with No Stop/Turn Signals on Honda Pilot
  • In both 4-pole and 7-way trailer wiring the brake and turn signals are carried on the same wires. On a 4-pole connector like the one # 18004 that you referenced the left turn and brake signals are carried on the yellow wire and the right turn and brake signals are on the green wire. On a 7-way vehicle socket, see the linked photo please, the stop/turn signals are carried on the pins at the 3- and 9-o-clock positions. There are several possible causes for the stop/turn lights on your...
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  • Can Truck with 5-Way Connector Connect to Trailer with 4-Way
  • You should be able to just plug the to connectors in and have the 5th circuit just not be used. Or you can cut off the 4-way and install a 5-way with part # HM47900.
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  • Cargo Carrier, Light Kit, and Wiring Harness for a 2000 Honda Accord
  • I will be happy to help you out. First, since all of the trailer hitches for the 2000 Honda Accord are Class I hitches you will need a cargo carrier that is rated for a Class I hitch. I have included a link to the available options for you. If you go with carrier # 6500 there is a light kit for it, # 6504, that comes with license plate mounting bracket. The left light has a light in it to illuminate the license plate. You will need to have a 4-Way flat connector on your Accord to activate...
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  • Guide for Installing Trailer Wiring 4-Way on a 2012 BMW X5
  • I can show you a wiring diagram for the # 119190KIT but what I think you will find even more helpful is the install video link I attached to this page that shows this kit being installed on a 2012 BMW X5 just like yours. This will show you exactly which wires to use for the harness and how to find them.
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  • How to Get Blue Brake Output Wire to 7-Way on a 2015 Ford F-150 with Factory 4-Way Connector
  • On a 2015 Ford F-150 that has the factory 4-Way flat connector you can either cut the blue wire back from the brake controller and run a wire from it to the blue wire on the # 37185 adapter like you said or access the wire were it terminates further back under the truck. I recommend the second method because it is less work and you can still just plug in the brake controller using harness # 22292 (for Tekonsha controllers) or the specific harness to match the brake controller you have. Both...
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  • Is the 12 Volt Hot Lead Required when Installing a 7-Way Trailer Connector
  • Trailers that use 12 volt power for accessories or that have a battery will use the 12 volt circuit in a 7-Way trailer connector. If the trailer does not have those items then you would not have to make that circuit active. That means that you would not have to run any wire or install a fuse or relay associated with the 12 volt circuit.
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  • Recommended 4-Pole Trailer Wiring Harness for 2002 Volvo V70 XC Towing Kayak Trailer
  • The wiring in your 2002 Volvo V70 XC All Wheel Drive is not heavy enough to handle the additional power demand from trailer lights so this is why the 4-pole harnesses we offer for it, such as Curt # 56146KIT and Tow Ready # 119179KIT, use a direct battery connection to get the actual power that will operate the trailer lights. With this type of powered harness the vehicle wiring only acts like a switch to tell the converter to draw power from the battery and send it through the 4-pole connector...
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  • 4-Way Trailer Wiring Harness for 2000 Honda Civic EX
  • Yes the Curt Circuit Protected Converter # C56175 is compatible with your 2000 Honda Civic EX. It will also work with your boat trailer if it has a 4-way connector.
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  • Adding a 7-Way Trailer Connector and Brake Controller to a 2015 jeep Renegade
  • The 4- to 7-Way adapter # 37185 is not vehicle specific. Your 2015 Jeep Renegade would just have to have a 4-Way flat trailer connector already to plug into the adapter. If it doesn't then I recommend # 118651. To add the 7-Way and wire in a brake controller I actually recommend # ETBC7. This comes with the same adapter, 37185, as well as the additional wiring and other parts needed to hardwire in a brake controller. For a brake controller I recommend the P2 # 90885 because it is...
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  • Pod/PowerTrac Brake Controller Just Shows Red Light and Trailer Brakes Don't Work
  • It sounds like you potentially have a problem on the red wire on your brake controller. This is the wire that tells the brake controller that you are stepping on the brake pedal and also sends power through the brake switch to light up the brake lights on the vehicle (when using the manual override lever). The red wire may need to be reconnected depending on if it is hardwired in or if you used a vehicle-specific connector. It also could mean that the vehicle has a blown stop light...
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  • Availability of Trailer Wiring in Different Connector Formats
  • We do offer both vehicle side 7-way sockets like # 37185 and trailer side 7-way plugs like the 4-foot # H20043 which work together and which are popular in the RV market. We also offer a wide range of trailer connector adapters that allow users to join vehicles with one type of connector to a trailer that has another type. There is no type of harness or adapter offered by etrailer that has an 8-pole configuration. Flat style connectors up to 5-poles are in use, and an example of an adapter...
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  • Troubleshooting E1 Error Code on a Hopkins Brake Controller
  • The E1 error code indicates a trailer is not connected. If you ever get this error and the trailer IS connected a probable cause is a dirty trailer connector. Check the trailer connector on the trailer and on the vehicle. Clean out any dirt or corrosion. Corrosion can build up behind the connectors where the wires attach as well. 99% of the time this code is seen all you have to do is clean the trailer connector pins. Especially if it is intermittent like yours.
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  • Adapter to Convert Vehicle 4-Pole to 7-Way RV Style Wiring Connector
  • We do offer a wiring adapter that converts a vehicle's 4-pole flat type connector to a 7-way round RV style. You can use part # 37185 from Hopkins or any of the other similar adapters shown on the linked page. I recommend the Hopkins because we sell a lot of this part and it is reliable, and it costs less than many of the other options. Also, it retains a 4-pole connector too so you will have both types on the Savana. Do note that when you use this adapter for your 7-way-equipped trailer...
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  • Can Both Receptacles of the Hopkins Endurance Multi-Tow Trailer Connector be Used Simultaneously?
  • Yes, you can use both ports on the Hopkins Endurance # HM48470 simultaneously. You will just want to make sure that you stay within your amperage rating or else you will begin to blow fuses. I have linked the above mentioned product to this page for your purchasing convenience.
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  • Adding a 7-Way Trailer Connector and Brake Controller to a 2014 Nissan Frontier with a 4-Way
  • First, there are a couple of ways you can add a 7-Way trailer connector to your 2014 Nissan Frontier. You could hardwire it or you can use a plug and play 7-Way. I recommend the plug and play type, # C56226, because it costs about the same as the hardwire kit, # ETBC7, and it will be much easier to install. If you choose the hardwire kit that means you also need to hardwire in the brake controller. But if you go with the plug and play style you would just need the brake controller and...
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  • Determining Wire Function On Boat Trailer With No Trailer Connector
  • It sounds like someone ran the wires as what we call a wishbone. The only way to tell how the wiring is connected to the lights is to use a 12V battery and a circuit tester like part # 3808. Attach the white ground wire to the battery negative terminal and then one by one connect the other wires to the positive terminal. You can have someone watch the trailer lights while you do the testing to determine what function each wire carries. Depending on how many lights you have on the trailer...
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  • Brake Controller and Trailer Wiring Recommendation for a 2014 Mercedes Sprinter
  • Since you do not have any trailer wiring at all on your 2014 Mercedes Sprinter you would need to start with a 4-way. For that you would need the part # 119190KIT. I attached an install video that shows this harness being installed on a 2014 Sprinter just like yours. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions...
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  • Can a 5th Wheel Trailer Hitch be Installed on a 2016 Ram 2500 Short Bed with Ram Box
  • In order to tow a 5th wheel trailer with a 2016 Ram 2500 that has the Ram Box feature you will need to use a Sidewinder pin box on the trailer. Sidewinders only fit in place of certain OEM pin boxes though. You can use the help article I have linked to determine if there is one for your trailer's pin box. First, for an installation kit, I recommend custom kit # C16427-204. There is less drilling required for custom kits. Then you will need a fixed 5th wheel hitch. For this application...
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  • Electric Trailer Jack that Plugs Into 7-Way Does Not Work when Plugged Into 2009 Dodge Ram 1500
  • First check to see if the 12 volt circuit is active on the 7-Way on your 2009 Dodge Ram 1500. Use a circuit tester such as # 3808 to test the pin in the 1 o'clock position. The truck key may have to be on. That pin should show 12 volts. If it does not then there could be a tow package fuse that is blown or missing. Use the lids on the fuse panels (under the hood and in the cab) to determine the tow package fuses to check them. If there is 12 volt power on that pin then the issue is with...
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