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Expert Answers about Wiring


  • Replacement 7-Way Plug and Lead to Replace Damaged One that Got Drug While Driving
  • You'll want to install a new plug and lead on your trailer to replace the damaged one. Would be a good idea to go with a longer one than you have now. The the adapter you referenced has a 7-way I am fairly certain that's the type of trailer connector you have. Especially since that's very common on camper trailers like you have. We have the part # 277-000143 which is a 7-way that has an 8 foot long lead that would work well.
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  • Troubleshooting Trailer Wiring Where All the Pins of 7-Way Have Voltage on Them
  • If all of the pins on your 7-way trailer wiring connector have voltage on that would indicate that you have a short most likely between the 12 volt accessory circuit and the other circuits. I'd recommend going over the wiring behind the 7-way looking for any cut or exposed wire and fix as needed. I attached a help article on troubleshooting trailer wiring for you to check out as well.
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  • Troubleshooting No Trailer Brake Light or Turn Signal on Left Side
  • Since you have tested your 2012 Ford F-250 with a multimeter like # ALL648349, you most likely have an issue with your trailer ground connection. Some vehicles using the same trailer may not have issue as the voltage sent may be ever so slightly different. The place to start now is checking that left side tail light assembly. You will have a ground connection whether using a separate wire or in the mounting hardware itself which is often used for a ground. Make sure that ground is...
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  • Recommendation for Adding 7-Way Trailer Connector to Hyundai Santa Fe Sport with 4-Way Connection
  • For your adapter from the 4-way to a 7-way, I recommend the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185. This will give you the option of adding the 12V power, the brake controller output, and the reverse lights. Even if you don't add those functions, you still need to install the white ground wire for proper function. If you want to add those features, I recommend the wiring kit # 5506. The trailer side 7-way will work well with this adapter on your Hyundai Santa Fe Sport....
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  • 7-Way Recommendation for 2018 Ford F-150 Towing 5th Wheel Trailer
  • We have just what you need. The Hopkins 5th Wheel 7-Way part # 41157 is a confirmed fit for your 2018 Ford F-150 and will give you a 7-way you can install in the bed of your truck. It will install inline with the 7-way you have at the rear of the truck and give you the second 7-way you can install in the bed of the truck. I attached an install video for this kit on a similar 2017 Ford F-150 for you to check out as well.
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  • How to Add 4-Way to Wiring of 5th Wheel Trailer
  • To wire in a 4-way you'd want the part # 18252 which comes with quick splices that you'd use to tap into the wiring of the first trailer. You have standard 4-way trailer wiring colors correct but your trailer may use different colors so you'd basically just have to check out the wiring that runs to all the lights of your trailer assemblies so that use the correct circuits. The # 18252 comes with a circuit tester to so you can test the wiring too and be sure.
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  • Should Trailer Batteries for Powering Trailer Jack and Breakaway Kit Be Separate
  • You will need a second battery to power the lights and jack you mentioned as the breakaway kit battery would not be strong enough for that and since it has to be fully charged at all times you would not want to have any other circuits draining it. You can charge it and the breakaway battery at the same time though with the same charge wire from your junction box.
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  • How to Add a 7-Way Trailer Connector to a 2007 Ford F-350 with Service Body
  • I looked in the owner's manual for your 2007 Ford F-350 and they did not list the colors of the trailer wiring harness for the trailer connector. Therefore, you will need to either test each one with a circuit tester like part # ALL640595 while the circuits are active or contact your local dealer for the wiring diagrams. If you need to replace the 7-way trailer connector or add one I highly recommend using the 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket part # HM40975-11998...
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  • Fuse Location for 7-Way 12V Power Pin on a 2010 Ford F-250
  • Check fuse 44 in the fuse block under the hood of your 2010 Ford F-250 as well as the relay in position 56. According to the online version of your owner's manual these are also related to the 12V power pin on your F-250. If those look good then the next thing you can do is use a circuit tester with a probe like part # ALL640595 and check the 12V wire from your 7-Way to your battery. Replace any pieces that are damaged or pinched with 10 Gauge Wire # 10-1-1.
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  • Can 4-Way With 5 Wires be Used as Replacement for Standard 4-Way
  • The spare 4-way you have is called a wishbone harness, such as the Optronics # A20WB which can be used as a replacement for your current plug. You will notice the two yellow wires you were referring to connecting to a single pin on your connector. The two yellow wires will likely be for the left side and right side running lights so you can connect those wires to those circuits on either side of your trailer, meaning you won't have an "extra" wire. I have also added a link to a help...
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  • Is There a Way to Trick Parktronic Sensors on a 2016 Mercedes-Benz Sprinter for a Bike Rack
  • I am not sure if this will have enough draw but we have testers like the Curt LED Tester # I26 which puts a small load on a 4-Way Flat connector. This is used to make sure that your wiring is working correctly but it may be enough to trick your sensors. If you have a 7-Way then I recommend using the Tow Ready # 20142 as it will simulate a draw as well. Please note that both of these products are designed to be plugged in for short periods of time and haven't been tested for prolonged...
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  • Troubleshooting Running Lights on Trailer Not Working
  • There are a number of troubleshooting steps you can take in order to determine the specific problem, but if these were working before it likely isn't a fuse or relay, it is almost certainly the wiring on your trailer or tow vehicle. To start you will need to use a circuit tester such as # PTW2979 to test the connector on your tow vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct...
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  • Brake Light Switch Wire Color on a 2018 Ford F-150
  • The cold side of the brake light switch on your 2018 Ford F-150 should be a purple/white wire but I really encourage you to test it with a circuit tester like part # ALL640595.
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  • Trailer Brakes Humming When Connected to Tow Vehicle
  • The trailer brake controller on your tow vehicle will send a small pulse charge to sense if a trailer is connected, so the small amount of power you are testing at the brake output pin on the 7-Way without the brakes engaged is normal. If you are hearing a buzzing or humming sound coming from the brake assemblies though as soon as you connect the trailer (without engaging the brakes) then I do recommend inspecting the wiring around brakes to make sure there aren't any exposed or pinched...
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  • Trailer Light Relay Locations on a 2014 Ford F-250
  • I took a look at the online owner's manual for your 2014 Ford F-250 and on page 215 is where the fuse and relay information starts. From what I could find it looks like you need to check the relays in positions 29, 74, 75, 76, and 102 for your trailer wiring. This is for the compartment found under your hood. There is also another compartment found on the passenger side behind a panel. This has fuses dedicated to the trailer lights as well. I am not sure if you check these already...
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  • Recommended 4-Way Flat Trailer Connector with Pigtail
  • I recommend using one of the Hopkins Easy-Pull 4-Way Flat harnesses. These have a connector with a loop in the middle that makes disconnecting your trailer wiring from your tow vehicle much easier than a standard 4-Way Flat connector. The wiring is also labeled which helps with the installation. This comes in a 12" version as part # HM48114 and a 48" version as part # HM38134. We also have the 12" part # HM48138 which has an integrated LED tester. I recommend using 16 Gauge Butt Connectors...
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  • How to Test a 7-Way Trailer Connector on a Tow Vehicle
  • Yes, in order to test the trailer connector on your tow vehicle you can use a standard circuit tester or a plug in tester like the 7 Way Trailer Connector Vehicle Tester part # TR20117. This is going to make testing the wiring on your tow vehicle simple. All you need to do is plug the tester into the trailer connector and then activate the signal while checking for the red light on the tester. If the red light appears you know that circuit is active but if not then you know there is an...
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  • Trailer Wiring Recommendation for 2017 Mini Countryman S
  • For your 2017 Mini Countryman the 4-way trailer wiring harness you'll want is the Tekonsha kit part # 119250KIT which is a zero splice kit that will install without requiring any hardwiring.
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  • Which Axle of Tandem Axle Trailer Normally Gets Brakes if Only One is Used
  • Typically if you are going to put brakes on only one axle of a tandem axle trailer you want to go with the axle that will have more of the weight of the trailer on it. In nearly all cases this will be the front axle but on boat trailer it's pretty common for it to be the rear axle. I attached a help article on adding brakes to an axle for you to check out as well. It will walk you through the entire process.
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  • What Does TM Light Refer to on Adapter 4 Pole to 7 Pole and 4 Pole # C57674
  • The TM indicator light of the Adapter 4 Pole to 7 Pole and 4 Pole # C57674 that you referenced refers to the trailer running light circuit. This circuit will be on if your tow vehicle has the running lights or headlights on. If not, then there's a short between that circuit and the head light or running light circuit of your vehicle.
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  • Brake Light Stays on When Trailer is Disconnected
  • If you can tell me the year, make, and model of your tow vehicle I can then look up what the code is referring to but if not you can find this info in your owner's manual. If the left brake light stays on all the time even with the trailer disconnected then you have a short between this circuit and most likely either the auxiliary or breakaway battery on your trailer. You will need to trace this wire back from the tail light assembly all the way to the trailer connector while checking or...
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  • How to Add 4-Way to the Back of Camper Trailer for Towing Second Vehicle
  • You can tap into the trailer's wiring at the rear of it to add a 4-way. We have the kit part # 18252 which comes with everything you'd need so it would be what I recommend. It comes with the circuit tester plus the quick splice connectors needed to tap into the wiring.
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  • Trailer Connector That Lights Up for use With 2019 Chevy Silverado 3500
  • We do have an option for a 7-way trailer end connector that has lights but plugging in the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 upside down would not allow you to see the LED function as it would face the ground. Instead I recommend checking out the Hopkins 7-Way RV Style Trailer Connector with Nite-Glow # HM48502 because it will illuminate when plugged in. I have added a link to a video review of this connector for you to check out which shows how the...
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  • Troubleshooting New Wiring Installation Causing Problems with Trailer Lights
  • Thank you for the details on the installation of your Hopkins wiring kit like part # HM48244. Whenever an issue is happening with the lights on a trailer it can typically be traced back to a bad ground. You did install a new wiring harness but since you just painted your trailer the problem is likely some paint that is causing a bad ground. Check all of the grounds for your lights and be sure that they are secure and connected to a clean, bare-metal surface as even a little paint...
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  • Turn Signal Lights Work on Trailer but No Brake Lights
  • I believe there is an issue on the vehicle's wiring as the connections you made are inline with the industry standard. Also, this would make sense because the stop and turn signals on a trailer with a 4-way connector are integrated into the same circuit so it sounds like the vehicle is only sending one of them or not combining them together. Can you please inform me of the year, make, and model of your tow vehicle in addition to what wiring harness you are using? I would first start...
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  • What are Pin Functions of 5-Way End on Wesbar Adapter # 787207
  • When looking at the 5-Way end of the Wesbar Coiled Adapter # 787207 like you described, with the male pin being number 5, the pin functions are as follows: 1. Backup Light Circuit 2. Right Turn/Brake 3. Left Turn/Brake 4. Running/Tail 5. Ground With this in mind it definitely looks like something might be miswired on your setup. The first thing I recommend doing is testing the 7-Way on your RV in the same manner that you tested the 5-Way on the adapter. The functions should match...
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  • Running Jumper Wire for Electric Brake Assemblies on Trailer
  • Since the wiring on your trailer is just running down the passenger side you can indeed connect it to the power wire on the passenger side brake assembly and then run a jumper wire from there to the assembly on the driver side. When doing this you will still want to ground each brake assembly separately to the trailer frame. This will make it so that you only have the power wire running across the trailer to the brake assembly on each side. I recommend using 12 gauge wire like # 12-1-1...
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  • Troubleshooting No Running Lights Front or Rear on 2013 Jeep Wrangler
  • On your 2013 Jeep Wrangler the parking/running lights not working on your vehicle will not be a fuse box issue since we know other functions still work. I recommend first checking to make sure you have the daytime running lights turned on. Next check the M17 and M18 fuses in the Totally Integrated Power Module located under the hood of your Jeep. Use a circuit tester to determine if power is getting to either side of each fuse using a circuit tester like # ALL640595. You can use the...
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  • Load Resistors for 2018 Toyota Tundra and 2010 Airstream with LED Lights to Remove Error
  • The Putco load resistors # P230004A-2 put out 6 ohms resistance each and you most definitely can install them yourself. I've attached a photo of the correct installation method to assist. They will get warm to the touch but you can absolutely install them on the inside of your RV where the wires come in from the tow vehicle. I wouldn't put anything right up against the fins as that would further reduce cooling and increase heat, but you won't have any issue in the location stated. The...
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  • How to Test a Brake Controller for Function
  • If you just want to check that there is power reaching the 7-way on the brake output circuit then all you need to do is use a circuit tester like part # ALL640595 and probe the pin in the 5 o'clock position. You can also use the 7 Way Trailer Connector Vehicle Tester part # TR20117 and look for a red light on the "BK" label. Please keep in mind that this is only going to tell you if the brake controller is sending out power. If you need to see exactly how much power is being sent then...
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  • Truck Camper 7-Way Harness for 2018 Ford F-150
  • We have exactly what you need! To easily hook up your truck camper I recommend adding the Tow Ready 7-Way Wiring Harness # 20110-010. This harness will plug right in line with the factory 7-Way on your Ford F-150 to provide you with an additional 7-Way that you can mount in the truck bed. I have attached a sample installation video that you can also use for reference.
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  • 7-Way Trailer Wiring Configuration
  • If either your vehicle or trailer 7-way wiring does not have all wires connected to activate all of the 6 possible circuits you can make that last connection to activate it. On the trailer side it is really easy to install a new full-functioning 7-way plug by adding a junction box like Epicord # 277-000141. This junction box includes a pre-wired 7-way trailer plug, like the one shown in the linked photo which is wired to the RV standard. By installing this box on the trailer you...
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  • Replacement 7-Way Recommendation for 2018 Ford F-150
  • For a replacement 7-way socket for your 2018 Ford F-150 we have the Pollak part # PK11893 which would fit and work well. Or if you wanted a similar 7-way that has a built in 4-way you'd also want the # 74682.
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  • How to Add Second 7-Way to Truck Bed of 2019 Ford F-350
  • For your 2019 Ford F-350 the easiest way to add a second 7-way up in the truck bed is with the 7-way adapter kit part # 41157. This plugs inline with the 7-way you have at the rear of the vehicle and gives you a second one to wire up in the truck bed.
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  • Troubleshooting Dim LED Lights on Boat Trailer
  • If the new LED lights you attached to PVC posts on your boat trailer are dim when powered by your truck then most likely the issue is a weak ground. Check to make sure each of the new LED assemblies are properly grounded to a clean bare metal surface on the trailer free of any debris or corrosion. If by chance you have an aluminum trailer, you will want to run the grounds to the main ground circuit on the trailer connector as aluminum isn't the best conductor of electricity. If...
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  • Can a 2013 Suzuki Grand Vitara be Towed Behind a Motorhome and Parts Needed
  • From what I could find online it looks like you can flat tow your 2013 Suzuki Grand Vitara as long as it is a 4WD with a transfer switch. If it is a 4WD without a transfer switch then you need to use a trailer to keep all of the wheels off of the ground. For a 2WD you can tow it using a tow dolly with the rear wheels off of the ground. You will want to verify this and specific instructions in your copy of the owner's manual. If you have a 2WD then I recommend using the Roadmaster Tow...
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  • How to Tow a Trailer with a 7-Pole Using a Tow Vehicle with a 7-Blade
  • All you need to do to tow your Airstream trailer with your 2007 Toyota Tundra is cut off one of the 7-pole plugs on the harness you have now and wire on the 7-Way Round RV Style Trailer Connector part # A7WCB. There is an adapter, part # 47595 for what you need but the plug will actually be more cost effective than an adapter. For future reference, the above plug is called a male trailer side trailer connector whereas the socket it plugs into is called a female vehicle side trailer connector.
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  • Tail Lights Go Dim with Headlights On
  • Generally speaking, when a trailer is plugged in and the lights go dim this points to signs of a bad ground. I would first start off by making sure you have the correct trailer connector adapter which should be the Adapter 4 Way Flat to 6 Way Square part # 30104. Once this is checked you then need to move onto the grounds. There can be a ground for each trailer connector and each tail light. I recommend removing each of these, sanding down the surface, and then using new mounting hardware. Please...
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  • Converting a Trailer with 7-Way to Vehicle with 4-Way
  • If the vehicle has a 7-way trailer connector and the trailer has a 4-way trailer connector then you can use the Pollak 7 Pole to 4 Way Connector Adapter part # PK12716 to attach them to one another. However, if the vehicle has a 4-way trailer connector and the trailer has a 7-way trailer connector then you can either use an adapter like the Mighty Cord Trailer Connector Adapter part # A10-7084VP or you can just cut off the 7-way on the trailer and install the Hopkins Endurance Quick-Fix...
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  • Troubleshooting 2015 GMC 2500 Factory Brake Controller With No Signal at 7-Way Connection
  • There are a couple connections that need to be made to activate your factory brake controller. You will need to attach a couple wires under the hood to give power to your controller. If these are connected then you will want to check the engine bay fuse block for fuse #1 in the micro J-case fuses which is the trailer brake fuse.
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  • Recommended Trailer Wiring Harness for 2012 Audi Q5
  • The Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Install Kit # 119190KIT is a great option for your 2012 Audi Q5. It does not replace your vehicle tail lights and turn signals but rather adds the trailer lighting functions. This harness draws power from the battery directly to protect your vehicle electronics. It will use quick splice connectors to connect to your vehicle wiring. If you don't want to change your vehicle wiring at all, you can use the...
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  • Are Available 7-Way Connectors Wired for US Made Trailers
  • The 7-Way trailer wiring sockets we have available such as the Pollak Metal # PK12703 referenced in your question do indeed feature the standard US pin configuration. I have attached an image that shows the pin locations and functions that you can use for reference. This is a 7-Way for the vehicle end. For the trailer end you will use # PK12702. Keep in mind though that the actual wire color used on both the vehicle and trailer can differ. Because of this it is always best to test the...
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  • Which Way Does Starwheel of Trailer Brake Assemblies Adjust to Tighten
  • If you check out the 4:39 mark of the video I attached you'll see how to adjust the brake star wheel. Pulling the star down pushes the pads out and would be the same on either side of the trailer. 106 Celsius is pretty hot. Something might be dragging so I'd recommend checking everything out.
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  • 7-Way Trailer Wiring Pin Locations
  • How can I help? I see the picture you submitted but beyond that it's a bit open ended as to what you are in need of. If you are unsure what wires go where you'll need to test to be sure or trace them. You can use a jumper wire from a 12 volt car battery to put voltage on each wire to see what activates.
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  • Adapter to Allow 2019 Mercedes GLS450 to Tow Trailer with LED Taillights
  • Newer European vehicles like your 2019 Mercedes GLS450 notoriously don't like trailers with LED taillights. For these situations the solution is the 7-way adapter part # 20142 which has diodes built into it so that the vehicle thinks a trailer with standard lights is being used.
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  • 7-Way and Brake Controller Wiring Recommendation for 1999 Ford E-450 Motorhome
  • If you have a totally dead 7-way on your vehicle I'd first check all of the fuse boxes of the vehicle for trailer wiring fuses/relays and fix as needed. You can bypass the factory wiring and install a new 7-way but it will require some splicing and wiring. You'd want to first start with a 4-way so that you can get all of the lighting functions. For that you'd want the part # 119190KIT. Then to convert it to a 7-way and wire in a brake controller you'd want the part # ETBC7 as this comes...
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  • Installing 12V Power On Ford F-150 7-Way Trailer Connector
  • You do not need to connect the 12V power connection on your F-150 7-way. That power is only required if you want to charge a trailer battery while towing or if you are using an electric device on your trailer like a powered sway control or wireless brake controller. It is likely that a fuse or relay needs replaced for the factory function if it was recently interrupted. I recommend checking your owner's manual for fuses and relays associated with this function. If you want to add that...
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  • Troubleshooting Trailer Lights that Work on 2 Trucks but Not on a Third
  • I would start by testing the trailer connector at the back of the Toyota and make sure the trailer running lights work at the connector. If not the problem is on the truck. In which case you need to check the correct fuse or inspect the connector and trailer wiring for any damage. Also check the ground location on the truck. If the problem isn't on the truck then it could be you need stronger gounds on the trailer. It won't be a damaged connector or wiring on the trailer since it...
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  • Can the Curt 7-Way Extension be Used with a PowerMax Converter to Power Trailer
  • Instead of using the Curt Extension # C56080 I recommend using the Bargman # 50-87-009. This comes with an extra 2' of wiring and it already has the female end disconnected so less work on your part! Then the correct wires that you need are the black and white wires. Black is for power and white is for ground. Be sure to follow the instructions for your PowerMax during the installation.
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  • Left Hand Tail Light Fuse Blows on Tow Vehicle with Trailer Attached
  • When a fuse on the tow vehicle associated with the trailer lights blows this means that you have an overdraw. The overdrawn is most likely associated with a short in the wire. The short could be anywhere from the trailer wiring harness where it connects to the vehicle's tail light all the way back to the tail light on the trailer. You will need to trace this wire back while checking for breaks in order to find the sort. I would also pay special attention to the trailer connectors to make...
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  • Changing to 4-Way and 7-Way Connector on a 2017 Honda Ridgeline
  • Since your 2017 Honda Ridgeline has the factory 7-way connector on it you should have a wiring harness that has the standard to package plug. It's the harness that plugs into the back of the 7-way connector and looks like the picture I attached. If this is how your 7-way connects then you can simply unplug the factory connector and replace it with part # HM40950 that has both a 4-way and a 7-way connector in one. If your factory 7-way plugs in in some other fashion let me know. Send...
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  • Does 4-Flat to 5-Flat Adapter Require Splicing
  • Each of the vehicle-side 4-Pole to 5-Pole Trailer Wiring Adapters such as the Tow Ready # 20036 will require you to spice the blue wire of the adapter into the reverse light wire on your 2018 Toyota Highlander. It is not difficult to accomplish because this kit does come with a quick splice connector and I have also linked a video for you which shows this adapter being installed on a Highlander. You will need a circuit tester like # ALL640595 to find the reverse light signal on your Highlander. The...
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  • How to Install the Curt Trailer Connector Part # C57101 on a 5th Wheel Trailer
  • The reverse light circuit is almost always on the center pin of a 7-way trailer connector which you can see from the attached photo. If your 5th wheel trailer has reverse lights then you can just tap into this but if not you would need to run a wire from the trailer side trailer connector all the way back to the end of the trailer. Please keep in mind that in order to install the Curt Trailer Connector part # C57101 you are first going to have to splice the Curt Universal Wiring Harness...
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  • Adding a 7-Way Trailer Connector to 2008 Ford F-150 with Factory 4-Way
  • Since you already have the 4-way trailer connector on your 2008 Ford F-150 you may only need an adapter, part # 37185. This converts the existing 4-way to a 4- and 7-way connector in one. It plugs into your 4-way and then the other wires need to be connected into the truck's wiring. Some models of the F-150 already have the wiring for the trailer brake output circuit and the 12 volt power lead ran from under the hood to the end of the driver's side frame rail. If you can find these...
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  • Troubleshooting Tail Light Flashing When Connected to Car
  • A battery not holding the correct charge would not cause tail lights to flash. If you are experiencing hyperflashing on your trailer tail lights, you most likely have LED lights that are not pulling enough power from the vehicle. To remedy this I recommend using an adapter like the Trailer Connector Adapter w/ Lamp-Out Sensor Bypass - 7-Way RV to 7-Way RV - Vehicle End # 20142. This will draw power like an incandescent bulb to prevent the LED hyperflashing issue. If the lights are...
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  • Ford Truck Sending Error Codes for Trailer Lighting
  • I suspect your trailer string lights use high-efficiency LEDs that are confusing the bulb out sensor in your Ford truck. Because LEDs use so little power to illuminate it can appear to these vehicle systems that there is no power being drawn by the lights and this triggers the sensor to send an error message. If so, you might try load resistors like # RK-506-2 or # P230004C-2 to see if that stops the messages. These will absorb some power and make it appear to the truck that a standard...
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  • Trailer Wiring Harness Needed for Hardwiring 4-Way to 2001 Toyota Tacoma
  • Trailer wiring has the turn signals and brake signals on the same bulb. Your truck has the brake signal on a different wire so you need a trailer wiring harness that's designed to convert these signals properly. For that you'd need a kit like the # 119190KIT which when you wire up the input side to your vehicle like the instructions show the 4-way will function like your trailer needs.
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  • What Circuit Does Purple Wire of 7-Way Usually Carry
  • On the 7-way wiring plug and lead part # H20046 there isn't a purple wire. Normally a purple wire for a 7-way is for a reverse light circuit. Which would correspond to the yellow wire of this adapter.
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  • Troubleshooting No Power to 12 Volt Accessory Circuit of 7-Way on 2016 GMC 3500 Sierra
  • Under the hood of your truck there's a power distribution box that has a connection that you need to make to activate the 12 volt power circuit of the trailer wiring. Under the brake booster is a wire that needs to be connected to a stud on that power box. If you check out the help article I attached you'll see how to do this under the finalizing the connections for the brake controller heading.
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  • Troubleshooting Trailer Running Lights with 2011 Dodge Ram Pickup
  • A wiring issue between truck and trailer is easiest to figure out by disconnecting the trailer from the vehicle and testing each one by itself. This really helps to isolate where the problem is. You can start by testing the 7-way on the Ram. You can use a circuit tester like # ALL640595 or # 40376 to test the contact for the running lights. The included photo points out the running light pin which is at the 11:00 position on the Ram's 7-way socket. Ground your tester and apply the probe...
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  • Trailer Brakes on Rental Car Hauler Trailer
  • According to U-Haul they have automatic hydraulic brakes on their car hauler trailers. I checked out their website and watched a few videos and they do have an integrated surge brake coupler. The emergency brake connector lever and cable you mentioned is a required safeguard breakaway system for surge brake actuators. I've attached an article on hydraulic trailer brakes to assist with the components for braking found on the car hauler. In most states trailers carrying over 3,000 lbs...
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  • Ways to Install New 4-Pole Trailer Connector
  • Four flat trailer wiring, also called 4-pole wiring, uses four wires and pins configured as shown in the linked photo of a trailer side 4-pole connector. The one pin that is different from the other three (on both trailer and vehicle side connectors) will be the ground pin and this usually has a WHITE wire that will ground to a clean bare metal spot the trailer frame with a ring terminal. The next pin is for the running light circuit and this typically uses a brown wire to activate...
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  • Running Light Blinks with Turn Signal and No Left Turn/Stop Light
  • It sounds like you may have the left turn/brake light signal wire and the running light wire mixed up or they are shorting out into one another somewhere along the trailer. I have attached a photo for you below which shows how a standard 7-way trailer connector should be wired. You will need to make sure the vehicle and trailer side both match but unless the vehicle side trailer connector was rewired at some point it should match this chart. If you have checked the locations of the...
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  • Will Curt 5th Wheel/Gooseneck Custom Wiring Harness for Aluminum Beds C57010 fit 2019 Ford F-250
  • I checked with Curt and the Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector for Aluminum Beds # C57010 WILL fit your 2019 Ford-F-250 with a factory 7-way so you did not order the wrong item. This harness will give you a 7-way and it does have a sharp 90-degree angle to fit in the sidewall of your F-250's bed, just like the Bargman # 54701-007-010 so you can stick with the Curt # C57010 and it will work great for you.
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  • Troubleshooting Trailer Running Lights Circuit Not Functioning
  • The running light circuit is on a different wire than the turn signals and emergency flashers so most likely there's an issue on circuit specifically. Typically when we see this problem it's corrosion on that circuit of the trailer connectors that cause the problem. Try inspecting the pins of the connector on both the vehicle and trailer to see if you can find any corrosion and clean as needed. I also attached a help article on trailer wiring for you to check out as well.
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  • Trailer Connector Adapter for a John Deere Tractor with 7-Pole Round Trailer Connector
  • I have attached a photo of what I believe you have on your John Deere Tractor. If that is the case then this is what is referred to as a 7-pole trailer wiring harness and in order to then adapt this for use with a 7-blade trailer connector you would want to use the Pollak Trailer Connector Adapter part # PK12-724. If this is not what you have please send me a photo and I would be glad to see if we have a better option for you. I have attached a review video for you as well.
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  • Troubleshooting Weak Trailer Brake Performance Trailer Brakes that are Grounded w 14 Gauge Wire
  • The first thing that pops out to me is that your ground wires are only 14 gauge when they really should be 10 gauge. That would be an easy thing to try. We sell 10 gauge wire as part # 10-1-1 (sold by the foot). Smaller gauge wire won't allow the full amperage to charge the magnets which will result in weak brake performance. I hope it's as easy of a fix as just that! But let me know how that goes and how the appointment with the RV shop goes too!
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  • How to Wire a 7-Way Trailer Connector on a 2015 Chevrolet Silverado 1500
  • I have attached a photo for you below which shows how both a vehicle side and trailer side trailer connector is typically wired. I say typically because this is not always exact and so long as the trailer and vehicle side both match it will not really matter. The colors used in this diagram also represent common colors for those particular functions but again this is not exact and so long as the functions match, the color of the wires does not matter. With that being said I do have the...
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  • Troubleshooting Trailer Tail Light That Stays On With Trailer Uncoupled and Wiring Disconnected
  • Since your trailer lights are getting some power even when the trailer is not hitched and not connected to the tow vehicle wiring this tell us that one of the batteries on the trailer, either the auxiliary battery for the lights or the breakaway battery for the trailer's electric brakes, is somehow leaking power to the lights. Most likely there is a short on the power leads to one (or possibly even both) of the trailer batteries. You can inspect all of the breakaway and auxiliary batteries'...
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  • How Do Wires of Adapter 4 Pole to 6 Pole # 30637 Attach to Vehicle
  • If you install the Adapter 4 Pole to 6 Pole # 30637 like it's intended to be installed you'd only need to plug the 4-way of it into the 4-way of your vehicle and that's all you'd need for the brown, yellow, green, and white wires. The additional white, blue, and black wires would need to get ran independently though.
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  • Troubleshooting Trailer Tail Lights That Stay Lit When Running Lights are On
  • You are on the right track by checking your connection points and grounds. Even though a white wire is typically associated with the ground that is not always the case. The headlights of your tow vehicle will cause the running light circuit of your trailer to leave the clearance lights on but if your brake lights are on then that is a problem. I would start off by making sure that you have all of the wires installed to the correct function. Since wiring is not required by law to be certain...
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  • Availability of 5-Way Flat Connector for Towing a Boat Trailer with a 2019 GMC Acadia
  • If you are just wanting an adapter for your 2019 GMC Acadia then you can use the Tow Ready # 20036. This connects to your 4-Way and then you wire the 5th (blue) wire to your reverse light circuit. For a more permanent option you can install the Hopkins # HM47900. This gives you a 5-Way that can also be used with most 4-Way connectors as well. I have attached an installation video of the adapter for you to check out. The installation of the 5-Way will be similar so the video will be...
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  • Can Factory 7-Way on GM Truck Power Electric Winch
  • The 12V circuit on the factory 7-Way connectors for your GM trucks won't have enough power to operate your winch, especially when it is under load. The problem isn't just the circuit's rating but also the wire gauge that is used. Powering an electric winch will require much thicker gauge wires to prevent them from being damaged. To wire up your winch I instead recommend using a winch wiring kit like the Bulldog # BDW20207. This includes 24 feet of 1 gauge wiring along with quick connects...
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  • Troubleshooting Stop/Turn Circuit of Trailer Wiring Not Functioning
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # ALL640595 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...
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  • Parts Needed to Add 7-Way to Rear of Dump Trailer
  • What you are going to need is the 7-way socket and lead part number # PK11898 which comes with the wiring you'd need to tap into your trailer wiring as well as a bracket to mount the 7-way. You'd wire the 7-way to your trailer wiring using the following as a guide for what the 7-way has: Red - Left Turn and Stop - 14 gauge White - Ground - 10 gauge Blue - Electric Brakes - 12 gauge Green - Right Turn and Stop - 14 gauge Black - Battery - 12 gauge Brown - Running Lamps - 14 gauge Yellow...
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  • How to Change Out 4-Way at Rear of Motorhome to Work with 7-Way on Trailer
  • Thank you for the pictures! What you may be able to do is install the Hopkins # HM47210 on your motorhome to replace your current 4-Way round connector. I'm guessing the 2 wires for your brake controller system are for 12V power and for the brake controller signal. If this is the case then you will need to connect the following functions on your motorhome wiring with the following wires from the Hopkins connector: White - Ground Yellow - Left Stop/Turn Green - Right Stop/Turn Brown...
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  • Location of Trailer Running Lights Fuse on a 2008 GMC Sierra
  • From what I found you're looking for fuse # 25 in the underhood fuse block. It's labeled "Trailer Park Lamps". If that doesn't fix it clean the trailer connectors on your truck and trailer and make sure they're clean. The running lights are in the 11 O'clock position on the truck and the 1 O'clock on the trailer. You can also test the pins on the truck's connector using a circuit tester, like part # PTW2993. If you have power there then the problem is on the trailer and you'll need...
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  • Is the Roadmaster 7-Way to 6-Way Connection Cable Waterproof?
  • The Roadmaster 7-Wire to 6-Wire Flexo-Coil Kit # RM-146-7 is a water resistant cable, but it is not waterproof because of the electrical connections. The connections will stand up to extreme rain without issue, but are not designed to be completely submerged. Using dielectric grease like # 11755 will help keep moisture and debris out of the connections as well, but won't allow the connections to be submerged. Many people that use this kit will also use the Roadmaster Battery Charge...
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  • Troubleshooting 12 Volt Accessory Circuit Not Functioning on 2012 Ford F-150
  • Not all vehicles have the 12 volt accessory circuit active from the factory but it's very possible that the 12 volt circuit of your 2012 Ford F-150 has a blown fuse or relay which you'd have to check under the hood to verify. Other option is to bypass all of the factory wiring and run a length of 10 gauge wire like part # 10-1-1 (sold by foot) through a breaker like part # 9510 to the positive post of the battery and then to the pin of the 7-way in the 1:00 position and the circuit...
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  • Should There be Continuity with the Brake Controller and Ground Pins on a Vehicle 7-Way Connector
  • Yes, when your brake controller is sending power back to your 7-Way connector you should have continuity with a Multimeter # BTMT15 between that and the ground pin. To ensure that you are sending power back to the brake controller pin set your brake controller to the highest setting and then have someone use the manual override. This will allow you to check for continuity. If you don't have continuity then that means something is wrong with either your brake controller or ground wiring. Let...
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  • Trailer Wiring Harness for 2011 Volvo S60
  • The issue is that the Curt T-Connector Vehicle Wiring Harness # C56224 is not a fit for a 2011 Volvo S60. What you will need to do is install the Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector # 119147KIT. This is a hard wire installation that will work with either LED or incandescent bulbs and includes the installation kit. I have added a link to an install video for you to take a look at as well as a link to a video review.
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  • 7-Way Recommendation for 2019 Ford F-250 for Bed of Truck When Towing 5th Wheel
  • The kit you will want is the part # 41157 for your 2019 Ford F-250. This plugs inline with the 7-way you have at the rear of your truck and allows you to install a second 7-way up in the bed of the truck for when you are towing your fifth wheel trailer. I recommend this kit over the others because of how well it works, the quality of the wiring and connector, and because it has the best price. I attached an install video for this kit for you to check out as well.
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  • 7-Way Wiring Recommendation for 2019 Ford F-350 Towing 5th Wheel Trailer
  • We have just what you need to install a 7-way in the bed of your truck. The Hopkins 5th Wheel 7-Way kit part # 41157 would be exactly what you'd need. It plugs inline with the 7-way at the rear of your truck so that you can then install a second 7-way in the bed of the truck up near the wheel well. I attached an install video for this on a similar 2017 Ford F-150 for you to check out as well.
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  • What Gauge Wire Should be Used for 12 Volt Accessory Circuit of 7-Way
  • You'll want to use 10 gauge wire like part # 10-1-1 (sold by the foot) for the power and ground circuit of a 7-way accessory circuit. I attached a diagram that shows how 7-ways normally are wired for you to check out as well. The center pin could definitely be used as a power circuit like you need but normally it's the 1:00 position circuit that's used for that and then the ground is in the 7:00 position.
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  • Troubleshooting Uneven Braking on Sides of Trailer That Switches Sides with New Brake Assemblies
  • You do have a very interesting situation on your hands. It would make more sense for you to have the same problem on the same side but the fact that it jumped from one side to the other leads me to believe that it is a wiring issue. Start off by checking the grounds for your brakes. Make sure they are secure and connected to a clean, bare-metal surface. If those look good then check the other wiring that is surrounding your brakes. If you have a jumper wire that runs along your axle...
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  • Troubleshooting Trailer Wiring Tester that Shows Stoplights Working but Not Turn Signals
  • That's really strange to see that the stoplights work on both sides but the left hand turn signal does not work. Those two circuits are carried on the same wire so it seems pretty strange to only see it work with the brake lights and not the turn signal. If you have a circuit tester like the part # ALL640595 handy I'd try checking all of the pins with that or by connecting to a trailer as it sounds like possibly an issue with the tester you are using.
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  • Running Light/Parking Light Fuse/Relay Locations on a 2012 Ford F-150
  • Are you referring to the lights on the vehicle or the lights on the trailer? Also, I believe you are referring to the parking lights as there are no running lights fuses on your 2012 Ford F-150. If that is the case then for the vehicle side you would need to check the two fuses in the interior fuse box which are a number 30 15 amp fuse and a number 40 10 amp fuse. If you are referring to the trailer side you would need to check one fuse and one relay which are both in the engine bay fuse...
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  • Magnetic Tow Lights Dim with Multiple Signals
  • It doesn't sound like to me that there is anything wrong with the lights or wiring. We have this complaint about magnetic lights quite often and there usually is nothing to blame. The turn signal and brake light are both carried through the same dual filament bulb. The circuit associated with the brake/running lights will generally be brighter than the circuit for the turn signal but this could vary depending on which circuit has the initial inrush of power. If you test each circuit directly...
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  • Troubleshooting 4-Pole Wiring Installation on 2010 Mitsubishi Lancer
  • Thank you for your purchase of the Tekonsha Circuit Protected Tail Light Converter with 4-Pole Connector # 119178KIT for your 2010 Mitsubishi Lancer and for your clear description of the problem with the lighting on your trailer. It sounds like you have been able to successfully test the various outputs on the 4-pole connector's pins with the probe tester included with the kit. This suggests the installation is correct. Therefore I suspect the issue is either a short-circuit or an overload...
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  • Recommended 4-Way Harness for 2018 Jeep Grand Cherokee
  • For your 2018 Jeep Grand Cherokee that doesn't have the factory harness I recommend the Tekonsha T-One Vehicle Wiring Harness # 118727. This custom harness will install by simply plugging into built-in ports behind the driver and passenger side tail lights and then running the hot lead up to the battery. This will provide you with a 4-Way connector to connect with and power a trailer's basic signal lights. I really like the Tekonsha harnesses in particular because we get far fewer troubleshooting...
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  • Wishbone Trailer Wiring Harness for a Magic Tilt Boat Trailer
  • I believe you have what is referred to as a wishbone wiring harness. A wishbone wiring harness has 6 wires and is the same as a 4-way for the exception that it has both running light wires ran to the trailer connectors as opposed to splicing them together and then running them to the trailer connector. The functions should be as follows: Green - Right Turn/Brake Yellow - Left Turn/Brake Yellow/Brown - Left Running Light Green/Brown - Right Running Light White - Ground Red - Reverse...
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  • How to Wire Kelsey Energize Trailer Brake Controller
  • The four wires on trailer brake controllers are standardized so they always connect in the same way. The black wire connects to the battery positive terminal (through a circuit breaker) to deliver operating power to the controller; the white wire is ground; the blue wire carries the controller's output to the vehicle's trailer connector; and the red wire connects to the cold side of the brake light switch. This red wire brings in the signal from the brake light switch and that tells...
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  • How to Install Trailer Wiring 7-Way on Older Truck with Separate Turn Signals from Brake Lights
  • You'll first need to install a 4-way on your truck that is designed to take separate turn signals and convert them to combined. For that you'd want the part # 119190KIT which will give you a 4-way that has combined circuits. Now 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 # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything...
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  • Solution for Trailer Lighting Circuits that Have the Brightness Switched
  • You have the circuits backwards on the taillight assemblies. Try switching the two circuits you have for each light assembly that have the stop/turn and the running light and you'll see the circuits work like they should.
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  • Tail Light Stays on with Trailer Disconnected
  • There are only really two things that could be causing the auxiliary battery to illuminate the tail light which is either a short in the tail light wire or corrosion on the trailer connectors. For starters, the easiest thing would be to look at the pins inside the trailer connectors on both the vehicle side and trailer side. Make sure none of them are bent or have any corrosion on them. If they are bent you can take some needle nose pliers and straighten them back out. If they are corroded...
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  • How to Activate Brake Controller and 12V Power Circuits in 7-Way Connector on 2005 Silverado
  • On the 7-way trailer socket on your 2005 Chevy/GMC pickup certain circuits such as the 12V trailer power feed and the brake controller output will not be active on the 7-way until you make connections at the power box under the hood. You can refer to the linked article which details the process of making those connections. Photos are included to show you where to find the red and blue wires. You will also need to install fuses to activate those newly-wired circuits. This too is covered...
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  • Troubleshooting Trailer Wiring When Turn Signals Cause Marker Light to Blink and Both Tail Lights
  • It sounds like your connection may have some corrosion or your splicing has allowed the jumping of power from one function to another. I recommend first checking your vehicle side connector using a circuit tester like # ALL640595 to determine if the functions are shorting on the vehicle side causing that issue. I've attached a video to assist. If the vehicle side wiring checks out, then it sounds like the color for color connection was not correct with the functions. The two brown...
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  • Troubleshooting Trailer Wiring When Running Lights Are Not Working
  • The running lights on a trailer are on a different wiring circuit than the brake/turn signals which on standard trailer wiring are combined functions and separated left side from right side. I've attached an article to assist. I recommend using a circuit tester like # ALL640595 to test the functions on your trailer connector. If the running light function works at the vehicle side trailer connection, then you will look to your trailer wiring. If it doesn't work on the vehicle side,...
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  • Troubleshooting Turn/Brake Lights on Trailer Not Working
  • Normally when one function works but others do not, it has to do with a bad ground connection. I recommend using a circuit tester like # ALL640595 to check each pin of your truck side connector for function first. Clean all the blades with some sand paper and use some dielectric grease # 11755 to protect it from corrosion and moisture. I've attached a photo to help with function locations. If that checks out, then connect the trailer and check the ground location near the coupler...
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  • Tail Lights Cut Out After Trailer Plugged In on a 2012 Mercedes-Benz Vito
  • It sounds like you are overloading the tail light circuit on your 2012 Mercedes-Benz Vito. In order to test this you will want to remove a few of the lights hooked up to the tail light circuit and then plug the trailer back in and see if the problem persists. If not then you know you have too much power being drawn for the tail light circuit. In order to fix this you are going to need to use a powered converter box. This is going to draw power needed for the trailer lights from the battery,...
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