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Expert Answers about Wiring


  • Will Hopkins Vehicle Wiring Converter HM48915 Operate Turn Signals In-Phase with Vehicle
  • The Hopkins Vehicle Wiring Converter # HM48915 will do what you need; it will take the separate stop and turn signals from the individual lights on your 1999 Nissan Frontier and combine them onto one wire as required by typical trailer lighting systems. With this in place you could then add a set of magnetic towing lights like # TL21RK. I confirmed with my technical contact at Hopkins that this converter's turn signal output will be IN PHASE with the vehicle's turn signals. You might...
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  • Troubleshooting Non-Functioning Running Lights on Trailer
  • When all lights on a trailer work except for the running lights this often has to do with a grounding issue. If a ground wire on the vehicle or trailer is loose or attached at a rusty or painted surface it may be able to pass enough current for some lights but not others. Turn and brake lights do not remain on continuously like running lights do. This is why that lighting function, with it's higher current demand, tends to be where a weak ground connection shows up. This issue has an...
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  • Recommended Replacement 7-Way Connector For 2001 Chevrolet 1500
  • I have attached a chart that shows the typical wiring for a 7-way connector you can check out. I have also attached a link to a helpful article that explains wiring. You can check the wires on your truck with a circuit tester like part # 3808 to make sure you get them attached correctly. The Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket, part # PK11893 will work well for your 2001 truck.
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  • 2006 Ford F-350 Integrated Brake Controller Troubleshooting: No Trailer Connect Message
  • What you described sounds like a short on the brake output circuit. What you will need to do is go over the trailer's brake output circuit looking for anything obvious that would cause a short like exposed wire or corrosion and fix as necessary. I also attached a help article on brake controller troubleshooting for you to check out as well.
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  • Replacement 7-Way Connector Recommendation for a 2005 Toyota Tacoma
  • 7-Way trailer wiring connector now have a universal style of connector on the back of them that looks like the blue connector in the picture I attached. Because of that all you would need to replace your 7-way in your 2005 Toyota Tacoma is the part # PK11893.
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  • Does Fifth Wheel Trailer Wiring Adapter for 2007 Toyota Tundra Require Tee Connectors to Install
  • To install the Tow Ready 90-Degree Fifth Wheel Adapter Wiring Harness # 54700-004 tee connectors are not needed. What you will end up doing is unplugging the factory 7-way and then installing this product inline with the factory wiring. Basically the connectors of this adapter are the tee connectors if you want to think about it like that.
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  • Why Would Vehicle Battery Not Hold Charge After Brake Controller Install
  • Here is what most likely happened. Your truck had a weak battery that was on it's way out. When you installed the brake controller you most likely had the doors open for an extended period of time which caused the weak battery to finally give up. Brake controllers when left plugged into a vehicle would not discharge the battery. Since you had the same problem with the controller unplugged that would indicate this as well. Your local auto parts store should be able to test your battery...
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  • Trailer Wiring Recommendation for a 2014 Mercedes GLK
  • The Curt trailer wiring part # 56146KIT is the confirmed trailer wiring recommendation for a 2014 Mercedes GLK like so it would be a great option if you are looking for trailer wiring. This is a universal type kit that will require hardwiring to the taillight wires of your vehicle though.
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  • Where is Trailer Wiring Fuse for 2015 Ram 2500/3500
  • I pulled up the owners manual of your 2015 Ram 2500/3500 and it looks like slot F30 is the trailer light fuse circuit you are looking for.
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  • 7-Way to 4-Way Adapter Recommendation for a 2008 Mercedes Benz ML320 CDI
  • For your 2008 Mercedes Benz the 7-way to 4-way adapter you would need is the part # PK12716. This will plug right into the 7-way of your vehicle and will provide you with a 4-way for your 2006 Trailmaster boat trailer.
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  • Fit and Compatibility of 7 Way Trailer Plug on a 2006 Toyota Tacoma TRD Access Cab 4X
  • Good news! I can help you find the right 7-way connector for your 2006 Toyota Tacoma. If you have a plug similar to the one I have linked to this page for you, and it isn't damaged too then I recommend the # PK11893. If your factory plug is hardwired directly to the 7-way, then I recommend the # HM40975-11998, this will give you a plug, just in case the 7-way plug were to get damaged again. With this harness you will just want to match function to function and splice the wires to...
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  • Troubleshooting Possible Trailer Ground Problem on Jayco Pop-Up Camper
  • What you describe sounds like a ground problem. With the running lights on, full power is being sent through the lighting system and that's when the problem would manifest itself. If the prong for the ground connection broke, it would certainly explain the problem you're having. If it's the actual prong from the connector that broke off soldering it wouldn't be strong enough, I'd recommend replacing the adapter with part # 30104. Be sure to check the grounds on the pop-up as well....
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  • No Running Lights from 4-Pole on Factory Connector of 2008 Dodge Durango
  • It sounds like your 2008 Dodge Durango has a factory-installed combination 4-way/7-way trailer socket like # 30955 or # HM40975. Both of these replacement parts install using a round 7-pin U.S. Car connector that plugs in to the back of the socket. Please refer to the linked photo to see the rear of part # HM40975 that shows the round plug. First, test without your adapter. Make sure the main ground wire on the truck AND trailer is securely attached to a clean bare metal surface,...
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  • Part Needed to Convert a Trailer 4-Way to a 7-Way for Adapting to a Coleman Pop Up Camper
  • To convert the 4-way signal of your 2002 Land Rover Discovery to a 7-way signal the part # 37185 would do just that and would be all that you would need. Now if your trailer has brakes and you need a way to operate them as well you would instead want the part # ETBC7. This comes wit the same connector as the # 37185 but it also comes with everything you would need to install a brake controller in your vehicle and connect it to the 7-way at the rear of it. For a brake controller I...
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  • Troubleshooting 7-Way Left Turn Signal Circuit Not Functioning
  • First thing you should do at this point is test the 7-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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  • Troubleshooting Trailer that Applies Brakes When Vehicle is Put In Reverse
  • It sounds like there is a short on the trailer side of the wiring. It sounds like the reverse light circuit is touching the brake output circuit which is causing the trailer brakes to apply when you put the vehicle in reverse. Check the connector on the trailer for corrosion and clean as necessary. Next check the wiring of the trailer connector as it leads back to the trailer. Most likely there is cut or exposed wire that is causing the short. I also attached a help article that has...
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  • How to Install a 7-Way on a Trailer that Had a 4-Way and Wire Up Brakes
  • If you are wanting to add brakes to your trailer, the correct way to to it would be to remove the 4-pole connector and install a 7-way harness/plug like part # H20046. You would use a junction box like part # 38656, and some 10 gauge wire like part # 10-1-1 to run the brake output circuit from the junction box to the brake assemblies. Each brake magnet will have two wires exiting it. One wire will ground to the trailer frame, the other will attach to the brake output circuit. The junction...
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  • Recommended 4-Pole Trailer Wiring Harness for 2006 Lexus RX 400h
  • The reason there are no plug-and-play trailer wiring harnesses for your 2006 Lexus RX 400h is that this vehicle's wiring does not have the current capacity to handle both the power required for the car's own lights plus that demanded by the trailer's lights. The vehicle wiring could be overloaded which would result in costly repairs. Powered harnesses like the Curt # C59236 (and the others for your car that are shown on the linked page) all operate by drawing the actual power for your...
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  • What Function is Carried on Center Pin of 6-Way Round Trailer Connectors
  • A 6-way round-pin trailer plug like Pollak # PK11604 has a center pin that can be wired in two ways. The most common function to be found on that center pin is 12V trailer power. This is a low-level maintenance charge that will maintain a charged trailer battery while you're driving. In other applications this center pin will carry the trailer brake signal from the brake controller mounted in the tow vehicle. Please refer to the linked photo that shows both inside and outside views...
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  • Toubleshooting Trailer Lights Not Working When Brake Pedal is Pressed
  • It sounds like you have a ground issue. You can use a circuit tester, like # 40376, to determine if the issues is on your vehicle or on the trailer. Using a circuit tester, you can test the pins on your vehicle connector to ensure they are all working properly. Another option is to hook the trailer up to another vehicle with properly functioning wiring to see if the trailer lights work properly. If the trailer lights work with a different vehicle or the circuit tester shows your vehicle...
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  • What is the Camco Replacement RV Power Cord CAM55132 Designed to Connect To
  • The Camco 30 amp power plug part # CAM55132 would be designed to plug into a connector like the # AR18206 or if you are looking for a harness to wire it to the part # AR14247 would give you a 25 foot long pigtail with the same male connector on the other end.
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  • Trailer Wiring Recommendation for a 2016 Chevy Trax
  • For your 2016 Chevy Trax the only trailer wiring kits we have available are universal style kits like the part # 119147KIT. We don't have a video yet for this wiring kit and your vehicle but I did attach a link to install instructions that will walk you through the process. Since this is a universal type of kit the instructions are generic but the process will be the same for any vehicle this kit is installed on.
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  • Recommended 4-Way Trailer Connector Installation On 2013 Ford F-150
  • If your F-150 has a 4-way connector it is typically located near the rear license plate. It can be tucked back up behind the bumper and may even be taped or zip tied to other wires or the frame of the truck. If there is no trailer connector, you will need to use the Draw-Tite 4-Pole Hardwire Kit, part # 18252, and locate the correct circuits behind the vehicle taillights for installation. The kit includes a circuit tester and the quick-splice connectors needed. I have attached a...
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  • Troubleshooting Trailer Wiring Where Taillights and Side Markers aren't Functioning
  • 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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  • Parts Needed to Install a 7-Way on a 2004 Isuzu Cab and Chassis Truck
  • You would need to start with the taillight converter/4-way part # 119130. This will convert the taillight signals and will give you a 4-way that you could plug into an adapter like part # 37185 to convert it to a 7-way. f you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller...
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  • Comparing Trailer Wiring Harnesses for the 2007 Volvo XC70
  • The difference between Tow Ready wiring harness # 119179KIT and # 119147KIT is what each is rated for. The 119179KIT is rated for 2.1 amps per stop/turn signal circuit, and 5.6 amps total for the running lights. The 119147KIT is rated for 2.1 amps per stop/turn signal circuit, and 7.5 amps for the running lights. It never hurts to have a higher capacity than what is needed so I recommend going with the higher capacity option, # 119147KIT. It will install in a similar manner as the video...
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  • Snowmobile Tilt Trailer has Some Running Lights/Marker and Clearance Lights Not Working
  • Running lights, side marker lights, and clearance lights all run off of the same circuit (the running light circuit). Since some of the lights are working that circuit is getting power so the issue must be with the lights themselves, a ground issue, or damage to the wiring. Since you have a tilt trailer it could be a weak ground issue. Running a jumper ground wire from the affected lights to the main trailer connector ground or axle will help. It will also help if the trailer is aluminum....
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  • Which Circuit Runs to Blue Wire of Trailer Wiring
  • Your trailer wire that is blue would be for the trailer brakes so the truck blue wire that is labeled electric brakes would be the correct one to use. Not every trailer has the need for a reverse light circuit.
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  • Dimensions of the Wesbar Wiring Harness and Pin Conductors # 54000-026
  • I can help get you the dimensions of the Wesbar wiring harness # 54000-026. The dimensions of the pin conductors on the # 54000-026 wiring harness are .182 of an inch wide by .334 of an inch tall for the uncovered conductors and .297 of an inch wide by .335 of an inch thick for the jacketed connector. The coiled cord length is 3 feet and the stretched cord length is 12 feet. I have linked an image of the connector for you to get a better visual of the measurements.
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  • Installing Curt Upgraded Circuit Protected Converter Hardwire Kit on 2008 Infiniti FX35
  • Curt has not confirmed that the # 56146KIT will work with the wiring on your 2008 Infiniti FX35. We do not have any wiring harnesses that are confirmed to fit the 2008 FX35. The best solution for a wiring harness will be to contact your local Infiniti dealer for a confirmed fit. If you decide you want to install the # 56146KIT, I can let you know how the harness was designed to work. Before installing the harness, it would be a good idea to check with your Infiniti dealer to make sure...
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  • Is There a Gooseneck/5th Wheel Wiring Harness Available with a Shorter Length of Wire
  • The shortest gooseneck wiring harness we offer is the Draw-Tite 5th Wheel and Gooseneck Wiring Harness with 7-Pole for Dodge with Factory Tow Package # 20111. This wiring harness is 7 feet long and will install behind the factory 7-Way on your 2007 Dodge Ram Pickup. The Hopkins Endurance 5th Wheel and Gooseneck Wiring Harness # HM42137 that you referenced is a great option, however it does not come in a length shorter than 10 feet. Typically the extra wire from the harness is bundled...
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  • What is the Wire Gauge Used in Optronics 20-ft. Wishbone 4-Way Trailer Wiring Harness A20WB
  • The Optronics 20-ft. Wishbone 4-Way Trailer Wiring Harness # A20WB is constructed with an aggregate wire gauge (AWG) of 20 for the brown, yellow, green and white wires. I confirmed this with my contact at Optronics. The white ground wire with ring terminal is 30-inches long to allow for flexibility in attaching it to your trailer frame. A solid ground is essential for proper operation of your trailer lights. Attach this wire to a clean bare metal surface. You can also use dielectric...
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  • Trailer Brake Controller Output Not Getting to 7-Way Trailer Connector on 2000 Dodge Ram
  • The brake controller output wire from the front of your 2000 Dodge Ram probably terminates at the connector that is located under the driver's side wheel well. In order to finalize the installation you must splice into this wire and continue it back to the plug. Use a circuit tester such as # 40376 to test the wires so you can splice into the right one. Then use some wire # 10-1-1 for 10 gauge or # 12-1-1 for 12 gauge, each sold by the foot, to continue the connection to the back of...
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  • Installation Of Pollak 5th Wheel / Gooseneck T-Connector On 2006 Ford F-250 Or F-350
  • I have attached a drawing of the rear view of the socket included with the Pollak 5th Wheel / Gooseneck T-Connector with 7-Pole, part # PK11893-11932. This is a confirmed fir for your 2006 Ford truck. As the drawing shows the numbers at the back of the socket are mated with the appropriate wire on the harness. These are installed after the hole in the bed has been cut and the harness has been fed through the hole. I have also attached a link to an installation video for this harness...
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  • How to Run Wishbone 4-Way Wiring to the Hopkins Endurance Quick-Fix Replacement 4-Way
  • What you would want to do is run the two wires together into one wire with a butt-connector like part # 05731-5 and then run a single wire to the part # HM48192.
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  • 6-Way to 4-Way Adapter Recommendation for RV Flat Towing Vehicle
  • To adapt a 6-Way round trailer connector to a 4-Way flat, you will just need an adapter like # 47305B that you have referenced. The turn signals and brake lights on the Winnebago do not matter because the signals at the trailer connector are already converted to have the brake lights and turn signals on combined circuits which is what trailers use. If for some reason you had separate trailer wiring on the RV you would need to make an adapter. You would need an adapter # RM-732 and a...
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  • Wire Gauge for the Wishbone 4-Way Trailer Wiring Harness, # A20WB
  • I spoke with my contact at Optronics about the Wishbone 4-Way Trailer Wiring Harness, # A20WB. They had documentation stating the green wire is 19 gauge and the yellow wire is 20 gauge. She could not state for sure what gauge the white and brown wires are but either 19 or 20.
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  • Troubleshooting Trailer Brake Light Circuit Not Functioning on a 1994 Chevy Truck
  • For trailer wiring confirmed to fit your 1994 Chevy Truck you would want the part # 118315. This will give you a 4-way connector at the rear of your truck. This will plug in line with the truck's taillight wiring to easily provide you with trailer wiring. If you tried installing this kit (or one similar) and the brake lights didn't work the problem would either be at the connection point for the for the wiring or the truck's brake signal circuit is not functional. Do the brake lights...
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  • Weak Brake Troubleshooting and Replacement Brake Assemblies for 7k Trailer Axle
  • There are a couple things you should check before you would want to replace your brake assemblies. I would check the main ground for the trailer. This is the wire that runs from the trailer connector to the trailer frame and provides the ground for the entire trailer. The ground strap may have come loose and now may not be strong enough to fully apply the trailer brakes. Some brake assemblies are manually adjusted. They could very easily be in need of adjustment. You will want to...
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  • 7-Way to 5-Way Trailer Connector Adapter Recommendation
  • We have exactly what you are looking for, you would want the part # A75TB. This is an adapter that will convert a 7-way trailer connector to a 5-way flat connector. I attached a review video for this adapter for you to check out as well.
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  • Adapter for 6-Way Round Vehicle Connector to 7-Way Blade Style Horse Trailer Connector
  • There is an adapter you can use to go from the 6-Way round on your truck to the 7-Way blade on the trailer. It is adapter # 47435. On this adapter the center pin for the 6-Way side is wired as the 12 volt circuit. If the 6-Way is the same on your truck then you do not have to do anything. If the center pin on your truck is for output to the trailer brakes then you would need to swap the 12 volt and brake wires on the adapter. Honestly, it would be better to just replace the 6-Way on...
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  • Troubleshooting Gooseneck/Fifth Wheel 7-Way Install Where Left Turn Signal Stopped Working
  • Does the left turn signal work on the 7-way that is at the rear of the truck? If so then the problem is that the connectors aren't making decent contact. Try uninstalling the # 41157 and testing to see if the left turn circuit works on the factory 7-way with a circuit tester like # 3808. If it does work then the problem is either in the connections made when installing the connector or somehow the connector is bad (not likely). If the turn signal on your truck isn't working you would...
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  • Troubleshooting Trailer Lights That Stop Working When Running Lights Switched Turned On
  • I can help you troubleshoot your trailer lights issue. Sounds like you are having a grounding issue with the right trailer light. I would recommend to pull that light off and check the surface that its mounted to on all sides. If it isn't mounted to a good clean surface it can cause some of the issues you are describing. If the trailer has paint, rust, or corrosion in the area you may want to sand that post spot off. Another option would be to remount the ground to a different location...
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  • Recommended 5th Wheel Wiring Harness for 2016 Chevrolet Silverado 2500 with 6-1/2-Foot Bed
  • For your 2016 Chevrolet Silverado 2500 with 6-1/2-foot bed I recommend one of the longer 5th wheel wiring harnesses such as Curt # C56000 or Hopkins # 41157 which are 10-feet long, or the 9-foot Bargman # 50-97-410. The 7-foot harnesses will be just long enough but not allow you the routing flexibility (or that nice bit of extra slack) that you'll have with one of the longer products. With any of these 5th wheel harnesses your bumper-mount factory 7-way will remain active after you install...
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  • Is the Hopkins 7-Way Adapter HM47200 Compatible with the Gooseneck 7-Way Adapter 41157
  • Yes, if you used the # HM47200 as a way to wire in a 7-way on your truck you could then use the part # 41157 as a way to also install a second 7-way in the bed of your truck for a gooseneck hitch or a fifth wheel hitch.
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  • Recommended Adapter To Connect Motorhome To Towed Vehicle
  • If you have a 7-way connector on your motorhome and a 6-pole connector on your tow vehicle like part # RM-910030-7, then the coiled adapter I recommend is part # HM47085. This has easy grip connectors and has a 3-ft cable. I have attached a link to a product review video you can check out.
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  • Adapter Availability for Going From Euro 7-way to American 4-Way
  • Bascially, there is no easy way to convert the European 7-Way to a US 4-Way. We do not carry any kind of adapter that you could use. You are left with 2 options. First, you would install a separate wiring harness which would be the easiest. Or, you could attempt to fabricate an adapter. You would need to use a converter, # RM-732. The red wire on the input side would attach to the brake light wire on the vehicle wiring. The white wire grounds to the frame. The yellow wire will attach...
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  • How Big is the Opening On the Back of the 9-Pin Connector PK12906 for Wire to Pass Through
  • I went out into our warehouse to measure the diameter of the opening on the back of the Pollak 9-Pole # PK12906 that you referenced and found it to be 3/4 of an inch. The socket part # PK12907 is made of ABS plastic. The mounting bracket part # PK12711U-26 that you referenced would fit and work well.
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  • Troubleshooting Trailer Running Lights Not Working on Trailer
  • I checked your order notes and it looks like you ordered part numbers # 9653P, # HM48192, and # HM48190. It could be as simple as a bad ground that is causing the running lights to now work, but since the bulb was blown that would more indicate a short on the wiring of the circuit somewhere. Check the wiring of the circuit for any exposed or cut wire and fix as necessary. I realize that's the last thing anyone wants to do in the cold but that is most likely the problem. The way you have...
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  • Gooseneck In-Bed Wiring Harness On 2016 Nissan Titan XD
  • If the 2016 Titan has a 7-way connector at the rear of the vehicle there is an easy way to add the in-bed wiring. I recommend the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness, part # 41157. This plugs into the wiring at the back of your 7-way and retains your 7-way by the bumper. You then just route the wiring to the location in the bed where you want to install it, use a hole saw to make the mounting hole and that's it. I have attached a link to an installation video...
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  • Recommended Bracket To Install 6-Way Connector On Front Of 2009 Honda CR-V
  • To install the RoadMaster 6-Wire Trailer Connector, part # RM-910030-7, you will need a bracket. The bracket I recommend is the Roadmaster Bent Electrical Socket Bracket, part # RM-910030-5. You need to find a flat surface that can support the connector and bracket.
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  • Troubleshooting Brake Controller that Only Shows Connection When Test Light is Connected
  • Try hooking up a trailer to your 7-way. I would be surprised if the controller didn't work. You see, the controller has to detect a load on the output circuit (the brake magnets), in order for the controller to sense a trailer and start activating the brakes. Since your controller shows a connection when a test light is applied that shows that it's working.
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  • Brake Controller Install Recommendation for a 2013 Chevy Silverado
  • For your 2013 Chevy Silverado there is brake controller wiring available under the dash. Below the steering column, there is a bundle of wires tied together with white tape, located left of the brake pedal. This bundle of wires is the tow package for the brake controller. Carefully cut the white tape binding the wires, and pull the wires down from underneath the steering column. You will use these wires to wire up the controller. There is a few connections that need to be made under...
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  • Availability of Replacement 7-Way that has a 5-Way Flat As Well
  • For a replacement trailer connector that has a 7-way and a 5-way you would want the Hopkins Endurance Multi-Tow 7-, 5- and 4-Way Flat Trailer Connector # HM48470. I attached an install video for this product for you to check out as well.
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  • Troubleshooting Error On Prodigy P2 When Breakaway Battery is Connected
  • It sounds like your breakaway pin isn't pushed all the way in. You can check this with a circuit tester like # 3808 to see if there is power on the wire coming from the breakaway going to the trailer's brakes. If the pin is inserted correctly you should have power going in the switch but not coming out. If you continue to have problems, I would be more than happy to continue to troubleshoot this issue with you.
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  • Trailer Hitch and Wiring for a 2016 Volkswagen Golf GTI
  • For your 2016 Volkswagen Golf GTI I recommend Curt trailer hitch # C11412. This is a Class I trailer hitch rated for 200 pounds tongue weight and 2,000 pounds gross trailer weight. If you want to use the hitch for an accessory such as a bike rack or cargo carrier then you have to make sure the accessory is rated for use with a Class I trailer hitch. Also, with a bike rack, you are limited to 2 bikes maximum on a Class I hitch. Curt also says you have to use stabilization strap # 18050...
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  • Troubleshooting Blown Fuses When Trailer Wiring is Connected
  • Blown fuses from trailer wiring are due to either a short somewhere on the trailer wiring circuit or that the trailer is drawing too much amperage for the circuit. Since you said you installed LEDs it would seem unlikely that it's drawing too much. Make sure that the trailer side connector 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...
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  • Replacement 7-Way Recommendation for a 2009 Ford F-150
  • You are going to need to replace the 7-way with a standard one since what you have is a non-standard connector that we don't offer anything for. For a 7-way that comes with a plug and lead you would want the part # 50-87-004. Then for a 7-way to 5-way adapter you would need the part # A75TB.
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  • Troubleshooting Trailer Wiring Harness On 1982 Nissan Pick-Up
  • For starters, I'd review the installation. Use your voltmeter or a circuit tester like # 40376 to probe the taillight circuits. Activate the left turn signal, and probe the wires until you find the wire that makes the tester blink or voltage pulse. Tap the yellow converter wire into that circuit. Do the same for the left turn, tap the green wire into that circuit. Push the brake pedal, and test the wires. Tap the red wire into the circuit that goes hot when the brake pedal is pressed. Activate...
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  • Installation of a 3rd Brake Light on a Leer Camper Shell on a 2009 GMC Sierra 2500 HD Crew Cab
  • I can help you wire a 3rd brake light on your Leer Camper Shell. First we need to locate the CHMSL (Center Height Mounted Stop Light) wire on your 2008 GMC Sierra 2500HD Crew Cab. If you have a 7-way already you will want to check behind that connection for a light blue wire. If you don't have a 7-way prewired you will want to look for a wiring harness up above the spare tire. You may have to push back the wire loom to see the wire but this light blue wire is used for the 3rd brake...
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  • Troubleshooting No Running Lights or Brake Lights on Snowmobile Trailer
  • I can help you troubleshoot this issue your having. I know you've checked for bad wires and grounds already, but it does sound like a bad tail light ground to me. If the clearance lights on the sides of the trailer are working, but the running lights at the rear are not, that is a good sign of a bad ground or a blown bulb. If you the turn signals work, but the brake lights do not, that is another sign of a bad ground because they operate on the same wire. To ensure all the lights...
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  • Running Lights On 5th Wheel Trailer Not Working on 2016 Chevy Silverado 3500
  • Usually when there is a function that is not working on a trailer the most likely culprit is a dirty or corroded trailer connector. Make sure the trailer 7-Way, the new 7-Way, # 50-97-410, and where the new 7-Way Tees into the bumper 7-Way are all clean and free of corrosion inside, where the wires attach, and outside on the pins. While it is unlikely the connectors on your 2016 Chevy Silverado 3500 are corroded it is still worth taking the time to check the connections. I also recommend...
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  • Will Pollak Trailer Connector Adapter Work For Wiring From Dump Truck To Equipment Trailer
  • To determine if the Pollak Trailer Connector Adapter # PK12-724 will work for your set-up, you will want to test to functions of the pins on the vehicle-end connector using a circuit tester, # 40376. Typically, the wiring connectors on commercial trucks aren't wired the same as the connectors on utility/equipment or travel trailers. I have attached a photo showing the likely functions of the pins in your vehicle-side connector. I have also attached a photo showing how the functions...
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  • Troubleshooting Trailer Left Blinker Not Functioning on a 2004 Ford F-150
  • Does the left blinker work on the truck? If it isn't working properly it can also prevent the trailer wiring from working depending on what type of trailer wiring setup you have. Try testing again with the circuit tester with the hazard lights on to see if the circuit starts to blink. That would indicate that the problem is a relay or fuse. But since you said you checked the fuses it's most likely a relay. Check the owners manual/fuse legend on the truck to see where the relays would...
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  • Repairing Cut-Off Trailer Connector on 2011 Ford F350
  • I'm assuming you're speaking of the factory tow package harness located behind the rear bumper. Ford might offer a harness that would allow you to plug in further up the truck bed, but the best bet we offer would be # PK11998 pigtail or if you're also missing the trailer connector, part # HM40975-11998. The pigtail would need to be connected to the cut wiring, so I'd recommend using a circuit tester like part # 40376 to determine which wire carries which circuit. Have a helper activate...
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  • Recommended 7-Way for 2012 Ford F-150 XLT Without Factory Tow Package
  • The Bargman 5th Wheel and Gooseneck 90-Degree 7-Way Pigtail Harness # 51-97-407 is a general-purpose wiring harness kit that is not vehicle-specific. This is intended for hardwired installation to the vehicle's existing wiring using the pigtail leads. Do note that the function carried on each wire is noted in the products specs. Matching wire functions is the best way to install a harness since wire colors are not 100-percent standardized. If you do not have any tow wiring on the truck...
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  • Why Would 12 Volt Accessory Circuit of 7-Way Short Out While Towing
  • You didn't say which fuse is burning up so it's hard to say. But most likely it's the 12 volt accessory circuit for the 7-way you have at the rear of your truck. Either the circuit is getting overloaded by the accessories you have wired to this circuit on your trailer or there is a short somewhere on this circuit that is causing the fuse to blow. Check the circuit for cut or exposed wire and fix as necessary as that is most likely the problem. Another possibility is that corrosion on...
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  • Troubleshooting Trailer Taillight Converter Installation on 2010 Mercedes-Bens GLK
  • Newer European vehicles use pretty sophisticated wiring systems that require following the installation steps to the letter. For starters, make sure the vehicle is off and the keys are out of the ignition. Then, connect the white ground wire on the Converter to a clean bare metal surface. Once that is complete, you can connect the black wire on the converter to the positive battery terminal. Make sure the fuse isn't inserted when making the attachment to the positive battery terminal, you'll...
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  • Why Would Truck's Trailer Running Light Circuit Keep Blowing if It's Not a Short
  • It could be just that the running lights on your trailer just draw too much amperage for running light circuit on your truck. Since you said it's a livestock trailer I have seen some that have quite a few running lights all around them. What you can do is try disconnecting a few of them on the trailer by either cutting the wiring to them or disconnecting the ground of the lights to see if the problem persists. If the problem stops you would need to either convert the lights to LED which...
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  • How Should Utility Lights be Wired on a Trailer
  • When you go to wire up the utility lights on your trailer the best way is to run the power wire to each light and then run the ground to either. Running them in series wouldn't be the best way since if one light goes out both go out like Christmas lights.
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  • 7-Way Round to 7-Way Blade Adapter Recommendation
  • The part # PK12727 is an adapter that does exactly what you described. It goes from a 7-way blade on a truck to a trailer that has a 7-way round connector. You might also consider removing the existing 7-pin connector from the trailer, and replacing it with the 7-way blade plug like part # A7WCB. The 7-way round pin is getting fairly close to being obsolete. The 7-way blade connector is much more prevalent.
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  • How to Make 7-Way Adapter for Scooter Lift to Plug Into 7-Way on Honda Ridgeline
  • The adapter part # PK12716 that you referenced only carries turn signal circuits so while I have a solution that would work, this would not be it. Instead you would want to wire the scooter lift power wires to a 7-way like part # PK12706. The ground circuit will be the pin in the 5:00 position and the 12 volt power would be in the 11:00 position.
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  • Troubleshooting 4-Way Flat Factory Connector Only Testing for Power on Turn Signals
  • Since you have a factory tow package wiring, I recommend checking the tow package fuses to be sure none of the fuses are blown. If the fuses are fine, next you will want to check the wiring behind the bumper for any damage. There may be a short from a cut or pinched wire that is causing problems with the 4-Way connector. Next you can test the functions of the 4-Way with the tester grounded on the ground pin of the connector. Using the 4-Way connector's ground will ensure that the...
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  • Recommended Wiring Harness For 2015 Chevrolet Silverado 2500 With Tow Package
  • The 7-way connector I recommend for your 2015 Silverado is the Bargman 5th Wheel and Gooseneck 90-Degree Pigtail Harness, part # 51-97-407. This includes the mounting bracket so that you can mount the 7-way connector in the bed of your truck. This has 7-ft wiring, so you can use butt connectors to attach to the wiring harness you said is included with your truck. If you do not want to mess with cutting or splicing wires, I recommend the Bargman 5th Wheel/Gooseneck 90-Degree Wiring...
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  • Wiring Adapter to Convert 7-Way Blade RV Style Trailer Connector to 7-Way Round Pin Style
  • We do have a wiring adapter for you to match up your truck's 7-way blade style connector to your trailer's 7-way round-pin type. The linked page will show you all such items which are offered in 1-foot overall lengths like Hopkins # 47595 and a 14-inch length as with part # ADP7R-7B from Custer.
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  • Troubleshooting Trailer Lights When Some Are Not Working
  • First, you will want to test the trailer connector on your vehicle with a tester like part # 3808. I have attached a link to a video that explains how to test the vehicle wiring. Most likely, the culprit is a loose, corroded, or broken ground. You will want to check the trailer connector for any signs of corrosion or damage and then check each of the lights to make sure they have secure grounds and the wires have not been damaged. If you find that the problem is on the vehicle side,...
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  • How to Wire a 4-Way to a Trailer that Uses Non-Standard Wire Colors
  • The colors on trailer wiring aren't always the same. The best option I can give you would be to determine the functions of each wire so that it can be wired to your new 4-way accordingly. Chances are one of the wires runs straight to the trailer frame. That would be the ground and would run to the white wire of the 4-way. If there is a wire that runs to both side of the trailer's lights that would be the running lights and would run to the brown wire. If there is a wire that runs to...
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  • Trailer Wiring Harness Recommendation for a 2016 Audi Q3
  • We checked with Curt and they have confirmed the wiring harness part # C59236 as a fit for your 2016 Audi Q3 so it would work well for you.
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  • Adapter Availability 13 Pin European to 4-Way US Trailer Connector
  • Unfortunately we do not have an adapter to go from a European 13-way trailer connector to a U.S. style 4-way trailer connector. European trailers typically have separate brake light and turn signal circuits, but U.S. trailers use a combined wiring system that use one wire for the turn signals and brake lights. You could make an adapter using a universal 4-way flat tail light converter like part # 119130, but you would need to find a European trailer side 13-way connector that can be...
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  • Replacement 7-Way and Wiring Harness Recommendation for a 2008 Ford F350
  • If you are looking for a replacement 7-way and harness for your 2008 Ford F-350 the part # HM40975-11998 that you referenced would fit and work well. I attached an install video for this harness for you to check out as well.
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  • Compatibility of Hopkins 7-Way # HM47210 With # 41157 Gooseneck/Fifth Wheel Wiring Harness
  • It sure would. The Pigtail of the # HM47210 unplugs from the pigtail, and the # 41157 would plug inline between the pigtail and the 7-way connector as shown in the photo I've edited for you. If you click the provided link, you can see the # 41157 being installed on a 2011 Ram truck.
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  • Wiring Adapter 7-Pole Round to 7-Way Blade with 4 Feet of Cable Between Connectors
  • The Pollak Trailer Connector Adapter # PK12-724 that you referenced offers 7-1/2 inches between the 2 connectors, and is 14-1/2 inches long overall. This is the longest pre-wired 7-Pole round to 7-Way blade adapter that we offer. You can use individual connectors to wire together an adapter that will have as much room between the connectors as you need. I recommend using the Bargman 7-Way Super Sealed Connector with 4 Foot Cable # 50-87-004. This 7-Way blade vehicle-end connector is...
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  • Video of Converting Trailer Wiring 4-Way to 7-Way for Ford F-150
  • I think I found the video you are referring to and attached it to this page. Basically it shows how to convert the 4-way of a 2013 Ford F-150 to a 7-way and activate the 12 volt power circuit. The adapter used in the video is part # 37185. Other parts used in the video: # 10-1-1 10 gauge wire sold by the foot # 05732-2 for butt end connectors # 459075-1 for wire loom # 11755 for dialectic grease # 7012A for 30 amp breaker
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  • How to Power Utility Light In Trailer That Has 4-Way Connector
  • You are on the right track. You will need to convert the 4-way to a 7-way so that you can tap into the 12 volt accessory circuit of the connector to power the utility light. For a 7-way with a 4 foot long section of wire you would want the part # H20043. Currently your interior light is ran to the running lights circuit of the 4-way wiring. You would need to run the light to the black wire of the new 7-way as that is for the 12 volt circuit. I attached a chart that shows how the 7-way...
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  • Replacement 7-Way Recommendation for a 2008 Toyota Tacoma
  • For your 2008 Toyota Tacoma the part # 118015 would work well as a replacement 7-way. The 7-way harness is now universal among basically all vehicle manufacturers to the 7-ways will all interchange with each other.
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  • Can 10 Gauge Wire be Used with Hopkins 7-Way Trailer Wiring Connectors
  • Yes, you can use 10 gauge wire like the part # 10-1-1 (sold by the foot) to wire up the 7-way part # HM48480 or # HM48500. Typically people use 10 gauge wire for the 12 volt accessory, brake output, and ground circuit and then use 12 for the remaining circuits.
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  • 7-Way Male to 7-Way Male Adapter Recommendation that is 4 Feet Long
  • To make an adapter like you are looking for would require the part # H20043 which is a 7-way with 4 feet of wires that you could then wire to a 7-way male like part # A7WCB. I attached a chart that shows the wiring colors for the # H20043 plus a diagram for a typical 7-way to help you wire up the adapter.
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  • 7-Way Trailer Plug Installation on 2001 Chevy Silverado 2500
  • I don't have a diagram, but I'd be happy to recommend the correct parts and match up the wire color coding for you. You could use the # PK11893 you referred to, along with the # PK11998 pigtail. Most of the tow package wiring can be found in a wiring harness above the spare tire. The yellow wire in the tow package harness connects to the red wire in the pigtail. The white ground on the tow package wire is connected to the white wire on the pigtail, the blue pigtail wire attaches to...
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  • 7-Way Trailer Wiring Connector Recommendation for a 1999 Ford F-250 with Factory 4-Way
  • To wire in the # HM40975-11998 would require a couple fuses and relays. Your best option is going to be to get the # 118243 instead as it comes with the fuses and relays needed. It also has a square connector that will mate right up to the trailer wiring connector you have on your truck already. Trying to install the harness you have would be quite a headache. I would strongly recommend you get the part # 118243. I attached an install video for this harness for you to check out as well.
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  • Fifth Wheel Trailer Wiring Recommendation for a 2011 GMC Sierra 1500
  • It sounds like you are looking for a 5th wheel/gooseneck trailer wiring setup that will give you a 7-way in the bed of your 2011 GMC Sierra 1500. The part # 20140 will work for that, but the part # 41157 would be a better choice as it comes with a 7-way and costs less. This will install inline with the 7-way you have at the rear of your truck and will allow you to install a second one in the bed. I attached an install video for you to check out as well.
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  • Troubleshooting Trailer Brake Light Circuit Not Active on a 2001 Chevy Silverado 2500HD
  • Check the CHMSL fuse under the hood of your 2001 Chevy Silverado 2500HD. What you described is a very common problem that kills the trailer brake lights on your generation of truck. You can easily tell if this fuse is blown by checking to see if the third brake light of the truck is activating properly when you step on the brakes. If it is not functioning then the problem is the CHMSL fuse.
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  • Switching Trailer from 7-Way to 4-Way and Right Turn Signal Does Not Work
  • On a 7-Way blade style trailer connector the brake lights and turn signals are on the same circuits. So you will have one for left turn and brake lights and another for right turn and brake lights. If the brake lights are working on the right side then the turn signal should also be working. If it isn't then there is likely 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...
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  • Trailer Wiring Recommendation for a 4 Cylinder 2009 Kia Sportage
  • The Tow Ready trailer wiring kit part # 119178KIT has been confirmed as a fit for your 2009 Kia Sportage 4 cylinder. But this is a universal fit style of harness that requires you to test the functions of the vehicle's wiring so that you can correctly attach the wires of the # 119178KIT. You will need to remove the rear taillight assembly to locate the wiring so that you can test it. I attached a link to a review video for this kit plus install instructions for you to check out.
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  • Interior Trailer Lights Not Working When Connected to a 2016 Ram 2500
  • My first question is to what are the interior trailer lights connected? They should be connected to the 12 volt circuit, if connected only to the trailer connector, or to a battery mounted on the trailer. If they are connected to a battery on the trailer then there is some wiring issue on the trailer somewhere between the lights and switch or the switch and battery. If they are connected to the 12 volt circuit on the trailer connector only then check the corresponding pin on the vehicle...
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  • Running Light Circuit Not Working on 4- to 7-Way Adapter # 37185
  • On the Hopkins 4- to 7-Way adapter # 37185 the brown wire is the running light circuit. There could be a break or a problem with the connection on that brown wire somewhere between its 4-Way and the back of the 7-Way. Also make sure that the white ground wire on the adapter is attached to a clean and corrosion free bare metal surface. This wire must have a good connection or you could run into problems with some of the lights. A weak ground could be the result of this issue since the...
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  • Parts Needed to Make 7-Way Round Trailer Connector Extender
  • You are going to have to make the adapter you need. But you will only need three parts. You will need the part # PK11702 as a male 7-way round connector, part # DW04914-1 for jacketed 7-way wiring sold by the foot (you will need to order the quantity in the amount of feet/extension length you need), and then finally a 7-way female connector # PK11720. These three pieces will easily wire to each other to make the extension piece you need.
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  • Trailer Wiring Recommendation for a 2004 Ford Escape without Tow Package
  • For your 2004 Ford Escape you would actually need a powered trailer wiring harness like the part # 46255 that uses the power from the vehicle battery to power the trailer taillights instead of the taillight circuits of the vehicle for the trailer taillights like the # 119178 does. A powered harness will have a wire that runs up to the vehicle battery and then uses the wires run to the vehicle taillights as signal wires. If you use the # 119178 on your vehicle you may end up shorting...
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  • Troubleshooting a 7 Way Round Connector on a International Tractor
  • I can help you troubleshoot your wiring issue. Sounds like maybe your connector isn't wired up properly. First thing I recommend is to check that your plug is wired up properly, I have linked a few images for your convenience. You should have power coming out of the 11 and 1 o'clock pins on the socket, use a circuit tester like # 3808 to make sure that the power is transferring from tractor to trailer when the running lights are on. If you do not have power on one or both of these...
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  • Semi-Truck Style Round 7-way to RV Style 7-Way Adapter Recommendation
  • To tow a trailer that uses a RV style 7-way blade-style trailer connector with semi that has a 7-pin connector, you will need to construct an adapter that also combines the brake signal into the right and left directional signal pins. This can be done by using a female 7-pin socket # PK11720 to accept the plug from the semi, a tail light converter # 119178 and a female 7-way RV blade-style socket # PK12707. The converter would be wired in between both sockets to combine the brake...
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  • Recommended 7-Way Blade Wiring Harness Extension
  • We do have a 7-way blade pin to 7-way blade wiring harness extension that may work for you, but it is 10 ft long. I recommend part # TLW6510. One end plugs into the 7-way connector on your towing vehicle and the other end has a 7-way port that your trailer can plug into. As I mentioned, this is 10 ft long. We do not have an 8-ft long cable with these connectors available.
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