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Expert Answers about Wiring


  • Trailer Lights Do Not Work with 1998 Ford Explorer or 2007 Ford F-150 but Do Work w/Other Vehicles
  • There isn't anything unusual about the 1998 Ford Explorer or the 2007 Ford F-150 that would cause the right side trailer lights to not work. there are some things you can check though to determine if the issue is indeed on the vehicles or on the trailer. First though it is possible for a trailer to work fine with one vehicle but not another even if there is no problem on the vehicle or trailer. What can happen is if there is a dirty or corroded trailer connector, some tow package wiring...
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  • Troubleshooting Trailer Turn Signals on 7-Way Both Having 12 Volts at all Times
  • The stoplight and blinkers circuits should not have 12 volts of power on them at all times. Typically when what you described happens it's because the 12 volt power circuit is shorting out to those circuits. If you paid someone recently to install the 7-way I would take the vehicle back and have them fix it. Another possibility is that the trailer wiring converter box that was used for the taillight circuits has shorted out due to a short on the trailer wiring. What you will want...
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  • 7-Way and Brake Controller Install Recommendation for a 2011 Ford F-350
  • A 7-way for trailer wiring will have the blinker and stoplights on the same circuit. I attached a picture that has a diagram that shows all of the circuits that a 7-way has. To install a brake controller like the part # 90885 in the truck you will need the correct install harness, part # 3034-P. If the vehicle had a 7-way from the factory that is all you would need to install the controller. If instead the vehicle had a factory 4-way you would need to then make a few connections under...
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  • Running Light Pin and Wire Not Working on 2001 Dodge Ram 1500 Factory 7-Way
  • It is possible that there is more than one fuse or possibly a relay related to the tow package running light circuit. Use the owner's manual and/or the legends on the in-cab and under the hood fuse panels to find all locations of fuses/relays related to the tow package wiring. I tried to find a copy online but was unsuccessful. There could also be a problem on the wiring somewhere between the connector and where it terminates further forward on the truck. Look for damaged or pinched...
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  • Power is Getting to Electric Trailer Brakes but the Brakes are Not Working
  • It sounds like there is a problem with the brake magnets on the trailer. Inspect the power wires to the magnets and look for pinched, frayed, or damaged wires and fix as needed. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces. You can visually inspect the magnets and if you can see the copper windings coming through the magnets will need to be replaced. To further test the magnets you can follow the help article I have linked. I have also included...
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  • Availability of 24-Inch 7-Way Blade Style Trailer Wiring Extension
  • We have several lengths of 7-way blade style wiring extensions, including a 24-inch from TorkLift, part # TLW6024. This and other similar wiring extensions can be seen by clicking on the linked page.
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  • How to Wire Up an Adapter to Tow Trailer for Motorcycle that has a 5-Way
  • Normally, the 5 wire flat connector will accept a 4 wire flat connector and work properly. The extra circuit on the 5 wire connector is normally wired to power a reverse lockout or electric trailer brakes not the brake lights. If your motorcycle has the brake light circuit connected to the extra circuit you will need to do some re wiring or install a converter, item # 119178KIT, on the motorcycle. Your trailer should be wired as follows. White wire = ground, brown = tail light, yellow...
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  • Troubleshooting Malfunctioning Right Brake Lamp on Trailer Towed by 2005 GMC Yukon
  • Since the right turn and brake lamp signal are carried on the same circuit, the problem is most likely in the vehicle wiring. Begin by using a circuit tester like # 40376 on the right turn/brake lamp pin in the 3:00 position on the 7-way. You should get signal on that pin when the brake pedal is pressed. If you don't, access the wiring harness behind the 7-way, and look for the green wire in the wire loom. Use the tester while the brake pedal's being pressed. If you see signal on the wire,...
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  • 7 Wire to 4 Wire Round Adapter Needed
  • I have attached a picture for you. If you need connectors like those in the picture then you can use the Hopkins Endurance Flex-Coil Trailer Connector Adapter with Nite-Glow, # HM47043. This adapter is designed for use when flat towing, 7-wire blade-style vehicle end connector and 4-wire round towed vehicle connector. If you have a different style of connector, please send me a picture and I will be happy to find a product that will work for you.
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  • Recommended Parts for Installation of Trailer Brake Controller in 2007 Toyota Highlander
  • Your 2007 Toyota Highlander is not one of the trucks for which a brake controller connection port is provided under the dash. This just means your brake controller installation will be hardwired and require use of our brake controller installation kit # ETBC7. This handy kit includes the 7-way, connectors, wiring, circuit breakers - everything you need to install a brake controller like the outstanding Prodigy P2 # 90885. Installing the ETBC7 kit is not difficult and you can see the...
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  • Should Trailer Wiring Have the Running Light Circuit Always Activated
  • The only time the running light circuit of trailer wiring should be on is when the headlights or running lights of the vehicle are on. You might have a shorted trailer wiring converter box or a bad relay if the trailer wiring is factory. I attached a help article on troubleshooting trailer wiring installs for you to check out as well.
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  • Fifth Wheel Trailer Wiring Recommendation for a 2015 Chevy Silverado 3500
  • For fifth wheel wiring for the bed of your truck you would want the part # 50-97-410 since it will plug inline with your current 7-way and won't require cutting and splicing like the part # 51-97-407 that you also referenced.
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  • Adding a 7-Way Trailer Connector to a 2000 GMC 3500 Sierra
  • In 2000 there was both a GMC Sierra model and a GMC C/K series with a Sierra trim option. If yours is an actual Sierra model then to add a compatible 7-Way you will need # HM40975 if there is a wiring harness up above the spare tire with a round plug. But if it is just a wire bundle, no plug, you can use # PK11898. It has the following wire functions: Red - Left Turn and Stop White - Ground Blue - Electric Brakes Green - Right Turn and Stop Black - Battery Brown - Running Lamps Yellow...
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  • Does Trailer Ground Circuit Run to Trailer Frame
  • The ground circuit of trailer wiring does often times run straight to the frame of the trailer. This makes for easier ground wiring of all the circuits that are on the trailer wiring. Instead of having to route every ground wire back to the trailer connector you can just wire it to the nearest section of trailer frame.
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  • 7-Way to 4-Way Adapter Recommendation
  • I have a better solution for you, but technically the part # HM47065 that you referenced would work go from a 7-way to a 4-way connector. What would be a better solution would be the part # PK12716. This will plug right into your 7-way and will allow you to connect your 4-way to it.
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  • Troubleshooting Non-Functioning Trailer Tail Lights
  • It sounds like you may be using a 5-pole wishbone flat trailer connector such as # A25W5B. This has dual brown running light wires to give you a separate wire for each side of the trailer. You can disconnect the trailer and vehicle and test each one individually; this will help isolate the cause for the problem. You can test the trailer directly with a 12V battery (use the vehicle's or a spare) to see if the running lights behave properly. If the running lights work when powered directly...
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  • Why Wouldn't Trailer Interior Lights Be Functioning When Connected to Chevy Truck
  • Sounds like the 12 volt accessory circuit on your 2003 Chevy Silverado 2500 7-way isn't activated as that is the circuit that usually powers interior lights on a trailer. You can test this by testing the circuit in the 2:00 position of your 7:00 for voltage. If none is there then the problem is the circuit not being activated. Since this circuit isn't always activated on Chevy trucks I am fairly confident you just need to complete the circuit under the hood of your truck. I attached...
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  • Tow Package Fuses for a 2007 Lincoln Navigator
  • It is very likely that your trailer's running lights are not working due to a blown running light fuse on your 2007 Lincoln Navigator. We have people come to our shop with trailer light issues and 90 percent of the time the problem is either a bad ground or a blown tow package fuse on the tow vehicle. The tow package fuses are located in the power distribution box under the hood. The fuse for the running lights is in location 12 and it is a 25 amp fuse. There is also a relay in location...
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  • How to Install a Universal Trailer Tail Light Wiring Harness on a 2006 Dodge Ram 1500
  • Your 2006 Dodge Ram 1500 actually has the separate tail light wiring system, meaning the turn signals and the brake lights run on separate wires. The tow package wiring will have the combined-wire setup, but if you are installing the Tow Ready Universal Wiring harness, # 119190, to bypass the factory tow package wiring, then you will want to follow the instructions for the separate (3-wire) system installation. This means the Yellow wire goes to the driver's side turn signal, Green...
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  • Troubleshooting Dim Trailer Interior Lights
  • Dim interior lights makes me think that you either have a bad ground on your assembly or the power source you are using isn't 12 volts. If the trailer is old it may be 6 volts. Make sure you are grounded to a clean, metal surface. Then you you can use a volt meter # BTMT15 to test the power wire to verify that you are getting full 12 volts at the lights. You might even try powering the light with a vehicle battery just to see if that makes it light up brighter as a way to test it.
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  • Troubleshooting Boat Trailer Lights That Blew Fuse
  • If your trailer caused the vehicle's fuse for trailer lighting to blow, then there could be a fault on the trailer. Your best bet is to disconnect the trailer wiring from the tow vehicle and test the vehicle connector to confirm if it operates correctly on its own. You'll need a circuit tester like # 3808 or # 40376 as well as a helper to activate the vehicle's lighting functions while you test the various pins on the connector. Please refer to the linked photo showing a 4-pole flat...
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  • Recommended Trailer Wiring Harness for 2011 Volkswagen CC
  • The Tow Ready trailer wiring harness # 119190KIT you referenced is a confirmed fit for your 2011 Volkswagen CC as long as it is NOT the 4Motion version. This harness is designed expressly for vehicles like yours that have multiplex wiring systems. It works with the CC whether it has LED or incandescent tail lights and also works with trailers with either type of lighting. The benefit of using a powered converter harness like this is that the car's wiring does NOT have to carry the actual...
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  • Diagram for Wiring 6 Volt Batteries in Series and in Parallel
  • It is hard to say for sure, but it sounds like something isn't hooked up correctly. I would double check to make sure that you are hooking up everything like it should. I attached a picture that has a diagram of how to wire two 6 volt batteries in series or in parallel.
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  • Trailer Lights Are Overloading Wiring in 2012 Volkswagen Jetta
  • The Curt wiring harness you referenced, part # 56146KIT, is the harness for the 2012 Volkswagen Jetta SportWagen. If you have the Jetta Sedan the correct wiring kit is part # 118572. These two harnesses have different maximum current capacities and the Tow Ready # 118572 offers substantially higher maximum output. It is possible that you trailer lights are demanding more current than the harness can deliver. Shutting off the car and disconnecting the trailer would allow the harness to...
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  • Connecting Electric Trailer Brake Wire on 2002 Chevrolet Silverado 1500
  • In the tow package wire bundle located near the spare tire on your 2002 Chevrolet Silverado, there should be a darker blue wire to which you can connect the blue wire from your wire harness, # HM40975-11998, with a butt connector, # 05732-2. If there is not a dark blue wire with your tow package wires, you will want to run a wire, # 10-1-1, from your wiring harness to your brake controller, # HM47294. Once inside the cab, you will need to cut the blue wire on your brake controller...
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  • What Parts Are Needed for Flat Towing a 1997 Suzuki Sidekick with Automatic Transmission
  • The best way to confirm your Sidekick's suitability for flat towing is to check the owner's manual under the heading recreational towing or by checking with your local dealership using your VIN number. Generally, a vehicle with automatic transmission is less likely to be flat-towable and may require use of a tow dolly like the Roadmaster # RM-2000-1. Other cars may need special preparation steps before towing them wheels-down. Your manual/dealership will clarify this for you. My online...
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  • Troubleshooting Curt Trailer Wiring Harness # C56175 in 2005 Mazda Miata
  • The most common fix for a wiring harness that works fine on some functions but not others is to re-position the ground wire. A weak ground can cause lots of odd behavior, including some functions working while others do not. Make sure the ground wire ring terminal is FIRMLY affixed to a clean bare metal surface on the car. You may need to sand off some paint or primer, clean off any grease or other foreign material, or you can relocate the ground terminal to a new position. Be careful...
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  • 7-Way and 4-Way Adapter for 4-Way Flat Connector on 2013 Ford F-150
  • To convert your 4-way flat connector to a 7-way connector, I recommend the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185. This adapter will allow you to use both 7-way and 4-way flat connectors. Installation on your 2013 Ford F-150 will be similar to the 2010 that you referenced. The 4-way flat from the adapter plugs into the 4-way flat currently on your vehicle. The white wire from the adapter needs to be grounded to the vehicle's frame. The blue wire on the adapter will need...
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  • Diode Wiring Kit Recommendation for 2014 Ford F-150 Towed by Motorhome
  • I recommend Roadmaster Universal Hy-Power Diode Wiring Kit part # RM-154. This kit is a confirmed fit for your 2014 Ford F-150. It wires diodes into your existing F-150 wiring and will use the factory lights when towing. We have detailed instructions for you to review, see link, and a video installation of this kit also.
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  • Troubleshooting Trailer Lights Not Functioning When Headlights are On
  • It sounds like you have a bad ground connection. If all ground connections are not making good contact to bare metal, when the tail lights are turned on then the trailer lights will go out or not function properly. You will need to check all of the ground connections especially where the tail lights are mounted to the trailer frame, and where the light brackets are mounted if they are bolted to the frame. If a plastic license plate holder is mounted between the left side taillight and...
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  • Troubleshooting No Brake Lights Working After Hopkins Wiring Install # 46365
  • You will need to use a circuit tester like part # 3808 to find the circuit that only sees voltage when the brakes are applied and use it for the stoplight circuit for the # 46365. It sounds like maybe you haven't found the correct circuit to use yet and that is why the stoplights aren't working. You should note that the recommended trailer harness is the part # 118526 that is a custom fit harness that would be much easier to install than the # 46365. I attached an install video
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  • Adding Fog and Reverse Lights to ISI-1185 Socket
  • You may be able to add either the fog lamps or the reverse lights -- but not both -- using the center pin on your current socket. That is, as long as the center pin isn't being used on both the trailer and the truck. To add the other function you will need a separate connection since all other pins are being used.
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  • 4-Way Flat to 5-Way Flat Adapter for Boat Trailer
  • We do have an adapter to go from a 4-Way on a vehicle to a 5-Way on a trailer. You can use # 20036. The extra blue wire will get wired into the reverse light circuit on the vehicle. The 5th wire on a boat trailer 5-Way is usually for an electric reverse lockout. When the vehicle is placed in reverse it sends a signal back to a solenoid on the actuator and does not allow the brakes to engage. You might also check your ground wire to make sure you have a clean ground.
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  • Troubleshooting Trailer Lights that All Come On With Blinker Activation
  • The problem is in the wiring of the trailer. It sounds like the circuits are shorting out to each other before they reach the taillight assemblies and that's why when certain circuits are activated all lights come one and when a turn signal is activated all of the lights blink. You will want to inspect the wiring from the connector all the way back to the light assemblies looking for any cut or exposed wire that could be causing the short and fix as necessary. I attached a couple...
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  • How to Determine Cold Brake Switch Wire Color
  • The cold side wire is often white, but to make sure you will need to use a circuit tester like # 3808 to test the brake switch wires. The key might have to be turned on for this test. You will need the wire that shows power only when the brake pedal is pressed. When you release the pedal it should not have power. And it should also not have power with the headlights or turn signals on.
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  • Troubleshooting Green Wire on Trailer Pulled by 2003 Ford Expedition
  • On a 4-Way flat trailer wiring harness, the green wire will go to the right turn signal. The white is the ground, brown is running lights, and the yellow is left turn signal. Take a look at the trailer wiring diagram that I included. This very well could be a ground problem. If so, correcting the bad ground or broken wire could solve the problem.
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  • Is Taillight System of 2005 Dodge Ram 3500 a 2 Wire or a 3 Wire
  • Your 2005 Dodge Ram has a 3 wire system. To install the 119190, the green converter wire would tap into the right turn signal circuit, the yellow into the left turn circuit, the brown into the running light circuit , the white would ground and the red wire would connect to a brake lamp circuit. If you're wanting a hardwire kit, I'd go with the # 119190KIT, which includes the kit for running the power wire to the vehicle battery and the circuit tester which aren't included with the # 119190. Going...
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  • Trailer Wiring Harness Compatible w/ LED Taillights of 2016 Kia Sorento
  • The Curt # 56146KIT will work with LED lights on the vehicle and incandescent trailer lights. However, this kit would need to be hardwired to the vehicle, which means splicing it into the taillight circuits. I'd recommend using the Tow Ready # 118269 which is a plug-and-play installation that's also compatible with LED taillights. Why cut the wiring in a brand new car when you can simply plug the trailer wiring harness in? The Tow Ready harness is actually less expensive by a few...
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  • Troubleshooting 5-Way Trailer Wiring When Reverse Lockout Is Not Working On 1997 Chevrolet Tahoe
  • It sounds like the reverse solenoid valve is not hooked up correctly. I have attached a link to an installation video for a solenoid valve that shows how the wiring is done. You want to make sure one of the wires coming from the valve is attached to the blue wire on the trailer 5-way wiring harness and the other wire is securely grounded to a clean, bare metal surface on the trailer. If everything is connected properly, you can check all of the wiring harness connections on the trailer...
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  • No Trailer Brake Lights when Connected to a 2004 Harley Heritage
  • Motorcycles and trailers designed to be towed by motorcycles have brake lights that are separate from the turn signals. In the US, regular trailers have combined brake lights and turn signals on the same circuits, one for each side. If the harness on your Harley is set up with separate brake lights and turn signal circuits but the trailer has combined then that could be why you are not seeing brake lights. This would also be the case if the connector on the bike had combined circuits...
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  • Solution for Towing a Coleman Camper with a 6-Way Square Connector with a Tow Vehicle with 7-Way
  • The connector you have on your trailer will need to be replaced as there isn't an adapter available for your setup. You will want to cut the 6-way round off of your trailer and replace it with a # H20043 by wiring it by function. You would want to apply 12 volts to each of the circuits on your trailer with a jumper wire and a car battery so that you can determine their function and then wire it to the # H20043 by function. I attached a chart that shows the colors of the wires and...
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  • Troubleshooting Flickering Trailer Running Lights Circuit
  • Most likely the problem is a slightly dirty trailer connector. You will need to take some fine grit sandpaper to the running light circuit of your trailer wiring harness on your vehicle and trailer to clean off any dirt or corrosion that would cause an intermittent connection. I attached a help article on troubleshooting trailer circuits for you to check out as well.
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  • Adapting a Semi Truck 7-Way to RV Style 7-Way to Use Wireless Light Kit to Flat Tow a Van
  • There isn't an adapter to go from a semi truck 7-Way to an RV style 7-Way but you could hardwire in a separate RV style 7-Way on the semi truck. You can use a circuit tester such as # 3808 to test the wires at the back of the semi 7-Way. It should have separate circuits for each turn signal and brake lights. If so then you will need to combine the separate circuits using a converter # RM-732 because an RV style 7-Way has combined turn signal/brake light circuits. On the converter...
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  • Why Would Circuits of the I26 Partially Glow When No Trailer Wiring Circuits are Activated
  • It sounds like your trailer wiring setup is fine. The thing about LEDs (like what the # I26 has), is that they require such a tiny amount of amperage to partially illuminate that when they are used in trailer wiring situations they can partially glow like you described if there is any amperage at all bleeding out of the circuit. What I would do is connect the 4-way of your 2014 Ford Explorer up to a trailer and see if it functions properly. If it checks out then you would be good to go.
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  • 7-Way and 4-Way Recommendation for a 2001 Toyota 4Runner with a 4-Way for Trailer Lights
  • Since you have a 4-way currently installed on your 2001 Toyota 4Runner, need a 7-way that will also retain a functional 4-way, and don't need to operate trailer brakes your best option would be the part # 37185. Your 4-Way will plug into this adapter and it will give you a 7-way and a 4-way that will operate the trailer taillights.
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  • 7-Way to 12 Volt Accessory Adapter Recommendation for Powering Cooler
  • The back of the Pollak 7-Way to 12 Volt Power Outlet Adapter, # PK11896, does accept the type of input that you would plug into a power port/cigarette lighter outlet. You will need to make sure that the 12 volt pin, located in the 1 oclock position (if looking at the face of the 7-Way), is functional. Use a circuit tester, like Quickee # 3808, to test the pin. With the adapter plugged into the 7-Way, you will be able to plug in a 12 volt accessory. Your brake controller should not...
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  • Boat Trailer Turn Signals and Brake Lights Work But Not Running Lights
  • If the turn and brake lights on your boat trailer work but the running lights do not, then this does suggest a potential grounding issue. Turn and brake lights will generally draw less current since they do not remain on as running lights do so sometimes a marginal ground will let some lighting functions work normally while others do not. You can also check your two connectors for any signs of discoloration or corrosion that could be interfering with signal transmission. Even slight...
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  • Recommended 7 Way Wiring Harness for 2010 Ford F-150
  • To add a 7-Way trailer connector to your 2010 Ford F-150 with a factory 4-Way you will need # 37185. This is a partial hardwire installation but on your truck it will be easy. I have linked a video that should help. Go to about the 10 minute, 50 second mark and forward to see the process of accessing the additional wires to make the 7-Way fully functional. You will also need additional length of wire. Part # 10-1-1 should work to reach the wires on the truck. You may also need butt connectors...
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  • Can a 7-Way Round Pin on a Peterbuilt 335 be Adapted to a 7-Way RV Style Connector
  • The 7-Way round on your Peterbuilt is likely the big rig style. This style does not have the same functions as an RV blade style 7-Way connector. On the big rig 7-Way the brake light and turn signals are on separate bulbs and typically RV style taillights are combined where the brake lights and turn signals are on the same circuit. What you can do is use a converter to combine the brake lights and turn signals. Converter # RM-732 has a white ground wire, red brake light wire, yellow...
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  • Light Kit to Flat Tow a 2015 Ford F-150 Behind a Motor Home
  • For your 2015 Ford F-150 you can use 4-diode kit # RM-154. This is a more permanent installation that does require tapping into the vehicle wiring. For a more temporary solution you could use a magnetic kit such as # C-ATL20A but you would need to also use tow light partners # TLP01 because of the aluminum used in the 2015 Ford F-150s.
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  • Adapter to Convert 7-Way Blade Style Connector on Vehicle to 7-Way Round Pin Connector on Trailer
  • It sounds like your trailer has a 7-way round pin connector. For an adapter, I'd suggest part # PK12727. The adapter would plug into the existing 7-way on your truck, and provide a 7 round pin female connector for the plug on your trailer. 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. I'll...
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  • Brakes Lock Up On Trailer When Plugged Into 2015 Chevy Silverado 2500
  • I am almost certain that the issue is that the connector on your 2015 Chevy Silverado 2500 and the one on the trailer are pinned out differently. I have included a picture that shows how a vehicle and trailer side 7-Way are wired (ignore the colors and go by function). It sounds like the brake output pin on the trailer is matched up with the 12 volt pin on the truck. As soon as you plug in the trailer the brakes will be getting 12 volts so they lock up. All you have to do is configure...
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  • Parts Needed to Convert 6 Way Connector to 7 Way on 2002 Foretravel U-270
  • To convert the 6-Pole on your 2002 Foretravel to a 7-Pole, you could use the Hopkins Trailer Wiring Adapter, # 47435, that you mentioned. Since you are not finding power on the 6-way, most likely the wires for the 12V power and brake controller output have not been run so you are correct, these will need to be run. For wiring you can use our Wiring Kit for Electric Brake Controllers, # 5506. The 12V power wire will connect to the positive side of the battery and brake controller output...
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  • Truck Trailer Connector Works but Camper Lights Will Not Come On
  • Since there is power on the vehicle side trailer connector the issue must be on the trailer. Plug the trailer into the tow vehicle and use a circuit tester such as # 3808 to see if power is making it through the trailer side connector. If not then you likely have to replace the trailer side connector. Also be you are using an adapter then that adapter may not be compatible or damaged. If power is getting through to the trailer side connector you can keep testing the wires as you go back...
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  • Can Factory Trailer Wiring Harness on 2015 Porsche Macan Deliver 40-Amps Current for Chair Lift
  • Since we do not sell the OEM wiring harness that was factory installed in your 2015 Porsche Macan you can determine its amperage capacity by checking with your dealership or by seeing what value fuse is associated with it. It is NOT likely that the wiring harness can deliver 40-amps especially if the vehicle uses low-power-demand LED lighting. You'll also want to confirm the actual power draw from the lift's motor; is the 40-amps continuous or peak current draw? Tri-Lift offers several...
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  • Wiring Adapter to Mate 4-Pole Flat Vehicle Connector to 4-Pole Round
  • The easiest and least-costly solution for mating your wiring connectors is to replace the connector on your portable lights with a trailer-side 4-pole like # HM48110. This will allow your lights to be connected to the 4-pole on your vehicle. If you need to convert a 4-flat to a round 4-pole you can use either # ADP001 or # 47465. I have linked our main page for wiring adapters and you can use the filters on the page to select each type of connector you need to see available adapters....
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  • What are the Blue and Yellow Wire Functions on a 1976 Travelmate Camper
  • The most likely function of the blue wire is output to electric brakes (on a trailer) or possibly a third brake light (on an in-bed camper) and for yellow it is likely 12 volt power. What you can do is use a separate battery and touch each wire to the positive terminal and see what turns on. Then you can label the wires accordingly. The other option is to trace each wire to see where they go.
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  • 4-Way to 5-Way Adapter Recommendation for a 2013 Jeep Wrangler Rubicon
  • We have exactly what you would need. All you need is the 4-way to 5-way adapter part # 20036. This will plug into the 4-way on your 2013 Wrangler and will allow you to run the 5th pin to whichever circuit on your tow vehicle that is needed. Typically this is run to reverse lights for either an electric lockout solenoid or for reverse lights. Check out the install video I attached.
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  • Wiring Harness Recommendation for a 1998 Volvo V70
  • Yes, the Curt wiring harness part # 56146KIT has been confirmed as a fit for your 1998 Volvo V70 so it would work well for you.
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  • 4-Way and Harness Recommendation for Rewiring a 4-Way on a Trailer
  • Sounds like you are trying to replace the 4-way and wiring of your pop up trailer. The Wishbone 4-Way Trailer Wiring Harness, part # A35W42B would work perfectly for you. The wire for the running light circuit is actually split into two wires, one to run down each side of the trailer. This harness comes with 35 feet of harness to run to each assembly. You would just need to remove the excess wire before connecting to the assembly. I attached an install video for you to check out...
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  • What Wiring Accessories are Needed to Install WesBarg 7-Way, RV-Style Connector
  • The WesBarg 7-Way, RV-Style Connector # WG54006-043 uses two different gauges of wiring so you will need two sizes of butt connectors. For the three smaller wires you will want Deka Heat Shrink Butt Connector - 16-14 gauge wire # DW05744-5. For the three larger wires you will want Deka Heat Shrink Butt Connector - 22-18 gauge wire # DW05743-5. When you install # WG54006-043 to your trailer you will want to make sure to test the wires by function instead of relying just on matching...
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  • Electric Trailer Brake Controller for 2015 Mercedes-Benz Sprinter Van
  • Trailer brake controllers like the popular and reliable Prodigy P2 # 90885 will install in your 2015 Mercedes-Benz Sprinter with installation kit # ETBC7. This kit includes everything needed to perform a hard-wired installation, including the 7-way vehicle connector. You van needs to be equipped with a working 4-pole harness like # 119190KIT that you referenced. The linked article and installation video will help illustrate the process.
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  • Troubleshooting Trailer Wiring that All Lights Turn On When Headlights are On
  • It sounds like the running light circuit of your trailer wiring is shorting out to the other wires of the trailer harness that you installed so that when you have the head lights on the power from the running light circuit is also being applied to the other circuits as well. I attached a couple help articles on troubleshooting for you to check out as well.
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  • Converting European 7-Pin Wired Vehicle to U.S. Wiring
  • Unfortunately it is not as easy as changing a plug. European style trailers are wired very differently than our trailers here in the U.S. The main difference between European trailer wiring and US trailer wiring is that European trailers typically use a 3-wire system and US trailers use a 2-wire system. The 3-wire system means the trailer will have separate wires for the turn signals, brake lights and tail lights. The 2-wire system will have one wire for the turn signals and brake lights...
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  • Recommended 4-Way And 7-Way Wiring For 2010 Subaru Outback Wagon Towing A Camper Trailer
  • I am a little puzzled why there would be a 7-way connector on the camper you are buying but as you said it has no brakes. If your Outback is the Sport model I recommend the Curt T-Connector Vehicle Wiring Harness, part # C56111. This plugs into the connections points located behind the tail lights on your Outback and you then run a hot lead wire to the positive side of the battery. I have attached a link to an installation video for this harness on an Impreza which is a different vehicle...
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  • How to Convert a Vehicle 4-Way to a 7-Way for Flat Wiring
  • We have exactly what you would need. To convert from the 4-way round on your Equinox to a 7-way flat you would want the part # HM47043.
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  • Should a Circuit Breaker be Used when Wiring Up 12 Volt Accessory Circuit of a 7-Way
  • When you run the 12 volt accessory wire from a vehicle 7-way for you want to run the wire through a 40 amp breaker like the part # 9510. You'll also want to be sure you use 10 gauge wire like the part # 10-1-1 which is sold by the foot.
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  • Trailer Wiring Harness Recommendation for a 2015 Mercedes Sprinter
  • The trailer wiring harness part # 119190KIT is a universal install trailer wiring harness that will also work on your 2015 Mercedes-Benz Sprinter. I attached an install video that shows it being installed on a 2014 Sprinter just like yours.
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  • When Installing a 7-Way on a Trailer is a Junction Box Required
  • You don't have to install a junction box when you install the # 50-67-008 on your trailer. If you wanted you could just run the wires to each function as needed. The black wire of this connector would be the one to use for the charge wire of your battery. Using a junction box like the part # 38656 would make installing the wiring easier though. I attached an install video for it for you to check out.
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  • Only One Trailer Brake Light Does Not Work, All Other Trailer Lights Work
  • Usually when all other lighting functions work except for one it indicates a bad ground. Ground problems normally show up when there is more draw on a system such as the constant draw of the brake lights. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
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  • Trailer Wiring Availability for a 1989 Jeep Comanche
  • We don't have any fit info for trailer wiring for your 1989 Jeep Comanche, but a universal trailer wiring harness like part # 119178KIT would work well since this is also the same harness recommended for the 1989 Jeep Cherokee which is what the Comanche is based off of. This harness comes with a 4-way connector.
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  • Mounting Bracket Replacement for the Hopkins Endurance Metal Trailer Connector
  • For a similar mounting bracket to what comes with the # HM48510 you would want the part # 118152.
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  • Trailer Wiring Adapter to Mate Vehicle 4-Pole Flat Connector to 6-Way Trailer Side Connector
  • We do offer wiring adapters to mate vehicles and trailers that have different types of trailer wiring. If your trailers have a round 6-way then you can use Hopkins part # 37175 which gives you BOTH a 4-pole and a 6-way round receptacle in one product. Or for just a 6-way round socket you can use the TowReady # 30637. If your trailer uses a square format like Jayco you can instead use # 30104. We always suggest using dielectric grease like # 11755 to help protect electrical connections...
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  • Trailer Hitch and Wiring for a 2014 Kia Sorento LX 4 Cylinder
  • All of the trailer hitches for the 2014 Kia Sorento will be visible beneath the rear of the vehicle. None of them have a concealed cross tube. The most popular hitch for your LX 4 cylinder model is # C13152. I have linked a video showing how it installs. There is a Hidden Hitch brand, but the hitch isn't actually hidden. It is # 87634 and I have linked a video showing installation for it as well. If you plan on doing some towing you might be interested in etrailer ball mount kit #...
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  • Wiring Harness Needed to Tow 1999 Mazda Miata Behind RV
  • In order to connect the lighting system on your 1999 Mazda Miata to your RV's and get the brake lights and turn signals required for towing, you will need Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles, # 154-792-118158. I have attached an article that covers the five basic components required to flat tow. Before getting the Miata set-up, I do recommend checking your owner's manual for flat towing compatibility and any restrictions or special instructions that they may have. The...
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  • Trailer Wiring 7-Way Recommendation for a 2004 Chevy Colorado with 4-Way
  • Sounds like you have a 4-way installed on your 2004 Chevy Colorado by the description you gave. A 4-way looks like part # 18004. If the trailer you plan to tow does not have trailer brakes then this 4-way would work well for you. If the trailer does have brakes you would also need the part # ETBC7 as it comes with everything needed to convert the 4-way to a 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885....
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  • Cold Weather 7-Way Trailer Connector Recommendation
  • Sounds like you would want the 7-Way Molded Trailer End with 6' Cable # 54006-009. This is a 6 foot plug and lead that was designed specifically for cold weather so it would work well for you. I attached a review video for you to check out as well.
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  • Intellitec Battery Disconnect not Working on 1998 Damon Intruder on a Chevy Chassis
  • If the battery disconnect you are using is electrically controlled then make sure that it is connected to a 12 volt circuit that has power when the ignition is turned on. On many vehicles you can use the radio fuse/circuit. Also some solenoids must have a good ground either through the mounting hardware or on a separate ground terminal. In either case the ground location must be clean and free of corrosion.
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  • Which Pin of a Trailer 7-Way is the Ground Circuit
  • Most likely your trailer has a 7-way and the reason you referred to it as a 6-way is because you didn't count the center plug. But either way I can help if you have either a 6 or 7-way. Since not all trailer connectors will use what is considered the standard wiring setup you would need to check out both of the connector diagrams I attached to determine which wire would be the ground circuit on the connector of your trailer.
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  • Pinched 7-Way Trailer Wiring When Turning and Now Trailer Lights are Not Working
  • It sounds like that the harness that connects the vehicle side trailer connector to the tow package wiring further forward on the truck is also damaged. That could be a dealer only part or we might have a replacement that can be hardwired in such as # PK11998. You will also want to check the fuse panels for any tow package fuses that might have shorted out causing some of the functions to not work. You will also want to use a circuit tester such as # 3808 to test the vehicle side...
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  • Adapter for Converting 4-Pole Flat Wiring Harness to 7-Way Blade Style
  • We offer part # 37185 to convert a 4-pole flat trailer connector to the 7-way RV-style format. This part has a 4-pole plug that matches up to the one currently on your Ford van. Once you plug this adapter in the lighting signals on the 4-pole will be sent to the corresponding pins on the 7-way. I do suggest you use dielectric grease like # LT37534 to protect those contacts from moisture and dirt. If you want to install the 7-way to allow use of a trailer brake controller like the popular...
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  • Recommended Wiring Junction Box For Utility Trailer
  • If you are wanting to secure the wiring on your trailer and keep it secure I recommend using a wiring junction box like part # 38656 on your trailer. You can place the junction box on the tongue of your trailer and run the wires from the trailer into one side of the box and on to the terminals. Then attach the trailer connector with wires cut to the appropriate length to the matching wires on the terminals inside the box and extend it so you can attach it to your vehicle. You want...
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  • Recommended Connector To Convert 4-Way On Roadmaster Magnetic Tow Lights To 6-Way Plug On RV
  • I have an easy solution for your trailer wiring. You can use a connector like part # PK11604. You would cut off the 4-way round connector on the light kit and wire the 4-wires to the appropriate poles on the # PK11604. You would need a circuit tester like part # 3808 to test the pins on the trailer 6-way and make sure they match up to the right wires on your wiring kit. Most likely the 4 wires will be the standard colors and will wire up color to color. These colors are: Green,...
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  • How to Make 6-Way Square Adapter for a Coleman Pop Up
  • Although we can not sell you an adapter that would work on your Coleman trailer because of propriety issues with Coleman, there is a way you could get your trailer lights to function properly. You will need to connect the # 30104 to your vehicle and then connect that to your coleman pop ups six way square connector. In order to get the connector to make the right connections you are now going to cut the wires on the # 30104 and strip the end of all the wires that were cut. Next, you...
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  • 4-Way Connector Needed to Replace 4-Way on Trailer with 6 Wires
  • Since you have six wires it sounds to me like you have a double ground and a left and a right side tail light wire. If this is the case you could use a wishbone harness like the 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire, # A20WB, as a replacement because it has the separate left and right side tail light wires. I recommend using a spare car battery to assist with testing the trailer wires for function. You will just need to ground the negative terminal of the...
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  • Adding a Trailer Wiring Harness to a 2007 Harley Electraglide Classic to Tow a Solace Camper
  • Motorcycles and trailers designed to be towed behind motorcycles have brake lights that are separate from the turn signal circuits. Provided this is true for your bike and trailer then you could wire a wiring harness directly to the bike's wiring. You would just need the proper vehicle side connector. It seems that many motorcycle trailers use a 5-Way flat so for a vehicle side you could use # HM47900. And I have also included a link to all of the vehicle side connectors we carry in...
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  • Trailer Lights Come On and Stay On Bright
  • It sounds like there is a short somewhere that you will need to track down and correct. A short would cause constant power draw and could explain why the lights come on and stay on. Make sure the vehicle and trailer side connectors are clean and free of corrosion. Inspect the wiring from the front to the back and look for any frayed, pinched, or damaged wire and repair as needed. I have included a couple of helpful links on testing and troubleshooting wiring for you.
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  • Troubleshooting Right Turn Blinker Not Functioning on a Trailer
  • It really sounds like the ground is not making good enough contact on the right turn signal/tail light and because of that it isn't able to draw enough amperage to illuminate the blinker function of your bulb. Nearly every time we encounter this problem the issue is just that the assembly isn't grounded enough. 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...
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  • Where Does the Red Wire of the Wiring Harness 119192 Go When Installing on a Vehicle
  • When you install the Tow Ready Wiring # 119192 on a vehicle whether or not you ground the red stop wire depends on the lighting configuration of the vehicle this harness is installed onto. If you have a separate wiring setup where your blinkers and stoplights are on different bulbs/circuits then the stop light wire gets run to the stoplight circuit of the vehicle. If your vehicle has combined taillight circuits where the brake lights and the blinkers are on the same circuit then you...
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  • Parts Needed to Convert a 4-Way to a 7-Way and Install Brake Controller in a 2002 Ford Escape
  • We have exactly what you would need to convert your 4-way to a 7-way so that you can install a brake controller and activate the brakes on your trailer. What you will need is the part # ETBC7. This comes with everything needed to convert the 4-way to a 7-way and install a brake controller. The # 37185 that you referenced comes with just the adapter 7-way, but it does not come with the wiring and breakers to complete the install. For a brake controller I would recommend the Prodigy...
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  • 7-Way Recommendation for a 2008 Honda Ridgeline
  • If you have a factory 7-way at the rear of your 2008 Honda Ridgeline but there is no voltage at any of the pins most likely you would need to check the fuse/relay panel to install/replace the towing related fuses/relays so that the 7-way would function. The only way we offer to install a 7-way on your vehicle would be to first install a 4-way like # 118400. 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...
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  • Trailer Wiring Harness Recommendation for a 2003 Subaru Legacy
  • For the Curt Trailer Wiring Harness part # 56146KIT that you referenced that has been confirmed as a fit for your 2003 Subaru Legacy I attached a link to the installation instructions and an install video that shows the harness being installed on a similar Subaru as yours for you to check out.
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  • Trailer Turn Signals and Brake Lights Not Working with a 2012 Ford F-350
  • A lot of Ford trucks use fuses and relays for the tow package wiring. Use the owners manual to locate all of the relays and fuses associated with the tow package wiring. Also, there can be tow package fuses in both the power distribution box under the hood as well as in the in-cab fuse panel. Checking fuses is easy but checking relays can be more difficult. the easiest way to test a relay is to use a known good relay in place of a potential bad one.
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  • Is Adapter Needed to Tow Trailer with 5-Way Flat with a Harley Ultra Classic with 4-Way Flat
  • Many times a 5-Way flat trailer connector will plug into a 4-Way flat connector. But if it doesn't then you would need an adapter such as # 47515. If the trailer is designed for use behind a motorcycle I am curious as to what the functions are for each of the 5 pins. On a typical 4-Way flat connector on a vehicle there is aground pin, running light pin, left turn signal/brake light pin, and right turn signal/brake light pin. And on a vehicle with a 5-Way flat the functions are the same...
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  • Troubleshooting Wiring On 2005 Chevrolet Z71 And Trailer
  • You can use a circuit tester like part # 3808 to test the 7-way connector on the back of your 2005 Z71. You would need to disconnect it from the trailer and have someone sit in the cab and run through the functions as you test each pin on the connector. If the wires on your vehicle check out okay, you will want to move to the trailer. make sure the connectors are clean of corrosion and dirt. Then check all of the trailer wires at the lights and make sure the ground wire is secured to...
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  • Install Instructions for Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness # 119190KIT
  • I have attached a link to the installation instructions for the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. Since this is a universal wiring kit, specific instructions for your 2013 Volkswagen Tiguan are not provided. Due to the instructions not being vehicle specific, I recommend testing the tail light wires before splicing and making your connections.
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  • Steps Needed To Set Up P2 Brake Controller in 2003 Silverado with Tow Package
  • Since you have the tow package wiring plug located above the spare tire all you need is a connector like the Replacement Multi-Tow 7-Way and 4-Way Trailer Connector, # 30955. You will just plug the adapter into the factory connector and mount the 7-Way at the rear of the vehicle. Then you will plug your Tekonsha Prodigy P2 brake controller # 90885 into adapter # 3015-P. The adapter will plug into a port under your dash. I have included an FAQ video below that should be helpful when...
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  • 7-Way to 4-Way Adapter Recommendation
  • Typically 7-way connectors already have combined stoplight circuits so all you would need is an adapter like part # PK12716. The red wire of a 7-way is typically the left turn/stop circuit so you might verify with a circuit tester like part # 3808 that the red wire you found doesn't also carry the blinker circuit. Otherwise you would need to make an adapter using a converter part # RM-732, 7-way # H20043, and 4-way # 20250.
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  • 2012 Audi A6 Trunk Liner Removal for Trailer Wiring Install
  • From the research I did on your 2012 Audi A6 it looks like to remove the trunk liner you will need to remove the warning triangle that is in your trunk and then remove the screw that holds the emergency release handle in place. There are 10 panel clips that hold the trim panel in place. You can use a panel removal or gently pull on the panel to get it to remove.
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  • Troubleshooting Trailer Blinkers That Both Aren't Functioning
  • Most likely you have a bad connection on the main trailer ground of your trailer if both of the turn signals aren't working. The higher illumination of that circuit might be too much for the condition of the current ground to illuminate the light. Each circuit would be separate so unlike Christmas lights if one goes out the other would not automatically go out as well. I recommend testing the trailer connector on the truck side. You will need 2 things. First, you will need a circuit...
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