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Expert Answers about Wiring


  • License Plate Recommendation for a Small Trailer Towed by Motorcycle
  • Most likely yes, but you would have to check with your local DOT to confirm that. An easy light to use would be the part # LPL31CB. This would tie into the running light circuit of the trailer's lights and would light up the license plate.
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  • 7-Way to 4-Way Adapter Recommendations
  • If you have a blade style 7-way you would need the part # PK12716 to convert it to a 4-way. If instead you have the less common 7-way round you would want the part # 118709.
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  • Solution for Trailer Brake Controller that Activates with Vehicle Hazard Lights
  • What you need is the part # 5501. This adapter is designed for your exact application. It will allow your hazards to illuminate and function without activating your brake controller each time the lights come on. I attached a diagram that details how it installs as well.
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  • Trailer Hitch and 5-Way Wiring Harness Recommendation for 2011 VW Touareg TDI
  • You are on the right track with the Curt Hitch part # C13116 but I have a wiring solution that will be easier to install. I would first recommend you start with the part # 118668 as it is a custom install harness designed to fit your vehicle that won't require any hardwiring. This will give you the 4-way functions without any hardwiring. Now to convert this to a 5-way you will want the part # 47515. This plugs into the 4-way and allows you to hardwire in the 5th circuit to the reverse...
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  • 7-Way to 5-Way Adapter Recommendation for 2008 Hummer H3 Towing Boat Trailer
  • The adapter you need is the part # A75TB which will convert the 7-way of your H3 to a 5-way so that you can connect to your trailer with a 5-way and all of the circuits needed will be active.
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  • What Size Wire Loom Is Recommended for Trailer 7-Way Wiring
  • For a wire loom for 7-way wiring we recommend 1/2 inch diameter like part # 459075-1 that is sold by the foot. I have a 7-way adapter on my desk that has a wire loom on it that is 1/2 inch so I know this size would be correct.
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  • Where Does Fifth Pin of Trailer 5-Way Run to Activate Reverse Lock Out Solenoid
  • Sounds like you are trying to activate a reverse lock out solenoid on a surge brake trailer so that it can back up freely. The fifth pin that is the furthest from the jacketed ground pin is the fifth circuit to use. This circuit would need to tap into the reverse light circuit of your tow vehicle. I attached an install video for the 5-way adapter part # 47515 that shows this process on a 2014 GMC Acadia.
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  • Universal Trailer Wiring Harness For 1998 Range Rover
  • The Universal Wiring Harness w/ ModuLite and Brake Controller Harness, part # 22550 is designed as a hardwire kit that pretty much includes everything you need to install a 7-way trailer connector on your Range Rover. The module protects your vehicle wiring and gets its power right from the battery instead of drawing power through the vehicle wiring which means no stress on the vehicle wiring. I recommend using a circuit tester like part # 3808 and test the wires on your vehicle to...
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  • How Do Trailers Maintain Ground Connection from Tow Vehicle
  • A trailer will use the vehicle's ground on the 7-way (or 4-pole), usually carried on the white wire, for its lights, brakes, etc. As you look at the vehicle 7-way socket (please see the linked photo) the ground is usually carried on the pin at the 7-o-clock position. It should not be necessary to make any ground connection to the hitch itself. In actual use the coupler/hitch ball connection does provide a degree of grounding for the trailer, but this will not be enough for all of the lights,...
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  • What Applications is the Flex-Coil Adapter part # 47015 Designed for
  • The Flex-Coil Adapter part # 47015 that you referenced is designed to plug into a trailer 7-way and convert the trailer wiring signals to a 4-way flat connector. As long as your truck has a 7-way (it would look like part # 37185) and your trailer has a 4-way this adapter would work well.
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  • Trailer Wiring Harness Recommendation for a 1990 Mazda MPV Van
  • You will have to use a converter style trailer wiring harness like part # C56175 which is a confirmed fit for your 1990 Mazda MPV. There will be no way to directly wire a 4-way to your van since it has separate turn signals and trailer wiring requires the signals to be converted to combined.
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  • How to Make 12 Volt Accessory Circuit of 2015 Silverado 3500 High Country Only Active With Key On
  • For some vehicles with factory 7-ways the circuit is only active when the key is on. Most however are on all the time. If the 7-way was hardwired to the vehicle then it will be on all the time unless an isolation solenoid was installed like part # TR118665. Basically this gets wired inline with the circuit and the center pin, when wired to a power source that is only active when the key is on, will activate the circuit so that the 12 volt accessory circuit would only get activated when...
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  • Adaptor for Going From 7-Way Blade to 5 or 4-Way Flat
  • Sounds like you are looking for the part # A75TB which is a 7-way blade adapter to a 4 or 5-way flat. I attached a review video for more info on it as well.
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  • Why Isn't There Specific Install Instructions for the Tow Ready Wiring Harness part # 119190KIT
  • I wish we had vehicle specific install instructions for the # 119190KIT that is a fit for your 2015 Audi Q5, but since this is a universal wiring kit we only have instructions that describe the process of what it would take to install this kit. Basically you would need to test the wiring of your vehicle taillights so that you can wire up this harness accordingly. I attached an install video on a somewhat similar vehicle that shows you the process.
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  • Tips for Installing a Trailer Wiring Harness on a 2008 Mercedes R320
  • Trailer wiring harness # 119190KIT is a universal type of hardwire harness so it doesn't have vehicle specific instructions for any vehicle. Basically all you would do is use the included circuit tester to probe the tail light wires on your 2008 Mercedes R320 and attach the harness' wires accordingly. The yellow wire is left turn signal, red is brake lights, brown is running lights, and green is right turn signal. The remaining wire is the power wire that connects to the vehicle battery....
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  • 4-way to 5-way Adapter Recommendation to Tow Trailer with Reverse Lock Out Solenoid
  • Sounds like your 2009 Lexus LX 570 has a 4-way trailer wiring harness and your trailer uses a 5-way that activates the reverse lock out solenoid of the trailer. The correct adapter you would need is the part # 20036. This will convert your 4-way to a 5-way and would work well for you. Typically the fifth wire is for a reverse lockout or light so it would get run to the reverse light circuit of your vehicle. I attached an install video that shows a typical install of this adapter.
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  • Brake Controller Recommendation for 2008 Lexus RX400h Hybrid
  • In the Q&A you refer to, we were explaining why there wasn't a plug and play non-powered taillight converter for your vehicle. You CAN install a trailer connector, as long as you use a powered converter which draws the power for illuminating the trailer lights directly from the vehicle battery rather than directly through the vehicle's taillight circuits which might not have the capacity for both the vehicle and the trailer taillights. In older vehicles, car manufacturers used higher...
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  • Installing a 4- to 7-Way Adapter and Brake Controller on a 2005 Pontiac Vibe
  • It looks like you have ordered 4- to 7-Way adapter # 37185 and a 40 amp circuit breaker, # PK54540. In addition to these parts I also recommend wiring kit # 5506. Use the wire that comes with this kit to attach to the blue and black wires on the back of the 37185. Run them under the vehicle towards the front avoiding areas that can pinch or burn the wire such as exhaust and suspension parts. The wire that is for the 12 volt circuit on 37185 (black wire) will connect to the vehicle positive...
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  • 7-Way to 7-Way Trailer Wiring Extender
  • The Bargman extension # 50-67-210 has trailer ends on both sides so it would not work. What you would need is an extension that has a trailer end on one side and a vehicle end on the other side such as # 20027. I have linked a video review of this part for you.
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  • Which Circuits on a Trailer 7-Way are for the Turn Signals
  • Check out the diagram attached that shows what each of the circuits on a 7-way are. The right turn will be the pin in the 3:00 position and the left turn will be the 9:00 position. It sounds like these circuits aren't making a solid connection.
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  • How Does Brake Output Circuit of Brake Controller Get Connected to a 2005 Pontiac Vibe with 7-Way
  • Since your 2005 Pontiac Vibe would not have came from the factory with a 7-way the one you have would be an aftermarket one. To connect to the blue wire of the connector will require you to run a 10 gauge wire back from the blue wire of the controller to the blue wire of the 7-way which would be the pin in the 5:00 position of the connector. I attached an install video that shows a brake controller and 7-way being installed in a similar 2003 Pontiac Vibe as yours for you to check out...
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  • Electric Trailer Brakes Not Working on 2002 Ford Excursion but Work w/2003 Ram with Same Controller
  • It is possible that on your 2002 Ford Excursion the output wire (blue on the controller) is not connected to the trailer connector at the back. You can test this by testing the 7-Way pin in the 5 o'clock position with a circuit tester such as # 3808 or a meter while someone sits in the vehicle and fully applies the manual override. If no power shows on that brake output pin then the likely cause is that the connection is not complete from the controller to trailer connector. This could...
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  • Adapter Recommendation to Go From 7-Way Round to 4-Way Flat
  • You have a 7-way round connector on your truck so you would instead need the part # 118709 and not the # 47345 that you referenced.
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  • Solution for Rewiring Up a 7-Way on a Trailer that Came Disconnected
  • I can help! Not every vehicle uses the same wire colors for wiring up trailer connectors so you will need to test the wires with a circuit tester like part # 3808 and then wire up the connector using the diagram I attached. Have a friend (or your wife if she promises not to "accidentally" run you over), apply the different turn signal and brake light functions until everything is identified. If you have a brake controller use the manual override lever of it to identify it.
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  • Replacement 4-Way Recommendation for Vehicle with 5 Wires Ran to 4-Way
  • For a very rugged replacement 4-way for you to use on your vehicle we have the part # HM48030 which would work well. Chances are you have two wires ran to the running light circuit of the 4-way. What you can do is run those wires together and then run them to the one running light wire of the # HM48030 and you would be just fine.
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  • Troubleshooting Trailer Running Light Circuit Not Functioning on 2014 Silverado LTZ
  • Your 2014 Chevy Silverado should not need the adapter part # 20142 to allow the running lights to work. Your truck is not known for having LED trailer taillights cause issues. I would first try inspecting the trailer connector on your truck to see if you can find any corrosion on the running light circuit (11:00 position). While you are there turn on the headlights of your truck and use a circuit tester like part # 3808 to test to see if voltage is on that circuit. If not, check the fuse...
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  • Trailer Wiring Harness for a 2007 Ford F-150
  • It sounds like that 2-pin connector you found might be related to power lights or a brake light in/on a camper shell. If it is not that then I am not sure what it would be for but I can tell you that it will not be for trailer wiring. To add a 4-Way on your 2007 Ford F-150 you can use # C56031. I have included a link to a video review of this harness for you.
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  • 4-Way Flat Wiring Harness Fit for 2006 Chrysler Pacifica
  • To add a trailer wiring harness to your 2006 Chrysler Pacifica, you will want to use a wiring harness with a converter. The converter works to change the separate taillight wiring on your Pacifica to combined wiring that is used on trailers. To be able to connect your Pacifica to your Jayco trailer that has a 4-Way flat connector, if your Pacifica did not come with a factory 7-Way connector, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118303. This...
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  • Troubleshooting Hidden Hitch Active Taillight Converter
  • The Hidden Hitch Active Taillight Converter, part # 31824 is designed to convert separate wiring from a towing vehicle and give you a combined wiring harness being towed. You will need a circuit tester like part # 3808 and test the wires on the vehicle you attach it to. If they all check out you will want to then test the pins on the trailer connector. If they are not functioning as they should there is probably an issue with the converter and it will need to be replaced. I could...
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  • Adapter to Convert 4-Pole Trailer Connector on 2002 Acura MDX to 5-Pole for Boat Trailer Actuator
  • We offer a handy plug-in wiring adapter # 20036 that will allow you to easily convert your MDX 4-pole wiring to a 5-pole format to match your boat trailer. The kit includes a quick-splice connector to allow you to connect the 5th wire (the single blue one) to the car's reverse light circuit. This will capture the reverse light signal required to activate your trailer coupler's reverse lockout. A circuit tester like # 40376 makes it easier to find the correct wire at the car's taillight...
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  • Trailer Wiring Harness Recommendation for a 2001 Chevy Prizm
  • All of the trailer wiring harnesses that you could use on your 2001 Chevy Prizm are going to install the same way. They all require testing the tail light wires on the vehicle to find the functions and then splicing in the wiring harness wires accordingly. There is one exception that does not require splicing the wires though you will still need to test the vehicle wires for function first. I recommend the ZCI harness # 119250KIT. With it you will just clamp its connectors around the...
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  • Wiring Harness for a Honda Valkyrie to Tow an Escapade Motorcycle Trailer
  • Actually, you would not need a converter style wiring harness on your Honda Valkyrie because motor cycles also have separate turn signal and brake like circuits like your Escapade trailer. All I need to know is what kind of connector is on the trailer so that we can get you the matching one for the bike. I looked at some pictures of the trailer and it looks like it uses a 5-Way flat connector. For a vehicle side 5-Way flat you can use # HM47900. The wire with the ring terminal is the...
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  • Troubleshooting Travel Trailer Right Blinker Not Working
  • There are a number of possible reasons your right-side trailer turn signal is not working. One quick visual inspection of the inside and outside of both trailer connectors can help you ensure that they are free of any damage or corrosion that could be causing the issue. If a connector is damaged, it is best to be replaced. If there is corrosion, you can try cleaning the affected spot on the connector with a wire brush To determine where the issue is originating, we will begin at your...
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  • Trailer Wiring Harness Options for a 2014 Subaru XV Crosstrek Hybrid
  • Trailer wiring harness # 119190KIT is a universal wiring harness. You could technically wire it up to anything. But it hasn't been tested on a 2014 Subaru XV Crosstrek hybrid. There is a harness that plugs in line with the tail light wiring on the Hybrid models. It is # C56243 from Curt. Or, if you wany the universal harness type but don't want to splice into the vehicle wiring you can use # 119250KIT.
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  • Parallel Batteries Versus Batteries Wired in Series
  • If two batteries are wired in parallel, the positive terminals of each battery will be connected together, as will the negative terminals. Assuming both batteries are 12 volt, you'll have a 12 volt output but there will be more capacity. If the batteries are wired in series, the positive terminal of one battery will be connected to the negative terminal of the other. This would double the output of the batteries, assuming each battery is a 12 volt, wiring the batteries in series would...
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  • Will Curt Fifth Wheel 7-Way Harness # C56000 Fit a 2015 RAM 3500
  • Yes, the Curt Fifth Wheel 7-way harness part # C56000 is a fit for your 2015 Ram 3500. Since nearly all 7-way harnesses use the same connections behind them this can fit most trucks.
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  • Brake Controller on 1995 Chevy Pickup Shows No Power when Stepping on Brake Pedal
  • On many vehicles there is more than one wire at the brake switch that can have power when the brake pedal is pressed. If the wire you are using now also has power with the head lights or turn signals on then it is not the correct wire. Also, if you are testing the controller while sitting still then it may not show any power when you press on the brakes. Many proportional brake controllers are like this and will only work with the brake pedal if the controller senses movement; specifically...
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  • Where Are the Brake Controller Install Wires for a 2008 Chevy Silverado
  • Sounds like the guy who you had install the brake controller may have been in over his head (no disrespect). But we can help! Your new body style 2008 Chevy Silverado did come with wires under the dash for wiring up a brake controller. If there were some that didn't we would have at least heard of one since we sell controllers for your truck all the time. To see how it would install check out the install video I attached. The wires are right under the dash near the brake pedal. That...
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  • Why Would Trailer Lights Work With Ground Wire Not Attached Then Stop When Connected
  • Some trailers will actually end up grounding through the coupler, to the ball of the ball mount, to the hitch, and then to the frame of the tow vehicle. It sounds like that is what you trailer was doing. Did the lights ever flicker when you hit bumps? That's a tell-tale sign that the ground is being made through the ball mount. Did you have the trailer on the ball of your ball mount when you tested the trailer again? That could still be the way the trailer likes to ground and why it...
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  • Adapter for Converting a 7-Way to a 4-Way
  • We have just what you need. For a 7-way to 4-way adapter you would want the part # PK12716. This will plug into the female connector on your vehicle and will provide you with a 4-way connector for the trailer. I attached a review video for more info for you to check out as well.
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  • Winch Wiring Kit Recommendation for Use at the Rear of a Vehicle
  • No, you would need to use a winch wiring kit like # SW2008 as the 7-way 12 volt accessory circuit is only going to be good for around 40 amps. This kit will give you thick gauge wiring to use at the rear of your tow vehicle for the winch. It uses the same quick disconnect connectors that winches use. I attached an install video that shows an install on a similar vehicle as yours.
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  • How Would a 2000 Land Rover Discovery II Wire to Connect to a Trailer with 6-Way
  • The only solution we are going to be able to provide is for you to cut off your Euro style connector that you have on your 2000 Land Rover Discovery II and install a 6-way that matches your trailer. You would need a 6-way like the part # PK11608 and would need to wire up the connector by function to the diagram I attached. There are two ways that a 6-way can be wired up so you would need to match how yours is wired on your trailer. The difference will be the 12 volt accessory circuit...
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  • Adding a 4- and 7-Way Connector to a 2015 Concord DS300 RV with 7-Way Connector
  • It is likely that the 7-Way connector on your 2015 Concord DS300 uses the standard US car connector type of connection. If you look at the back of it there should be a harness that plugs into the back of the connector. There is a locking tab you can pull out to remove that harness from the back of the 7-Way. If that is how your RV 7-Way is set up then you can just replace the 7-Way with # HM40950 that you referenced. If the harness cannot be unhooked from the back of the 7-Way then what...
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  • Towing a Trailer Designed to be Towed by a Motorcycle Using a Truck
  • Motorcycles and the trailers designed to be towed by them have turn signals that are separate from the brake lights. This is different than what regular trailers and vehicle trailer connectors have. they are set up with the turn signals and brake lights combined on the same circuits. The easiest thing to do is to wire up your truck with a matching vehicle side 5-Way such as # PK11502. This will be easy if your truck has turn signals on separate bulbs than the brake lights. You will...
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  • Recommended Wiring And Brake Controller For 2007 Nissan Pathfinder
  • If your trailer came with a 7-way connector it may have brakes. If that is the case then you will need a brake controller for your Pathfinder. I recommend the P2, part # 90885. This is our most popular because it is easy to install and operate. Your Pathfinder has a brake controller port under the dash and the other end simply plugs into the back of the brake controller. You then need to go to the back of the vehicle and under the back on the driver side frame rail between the axle...
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  • How to Find Reverse Light Circuit on a Vehicle that Has Reverse Lights Mounted in Hatch
  • Between the hatch and the door frame will be a wire loom in a rubber conduit that will be carrying the reverse light circuit. What you will want to do is peal back the conduit so that you can test the wiring there for a circuit with a tester like part # 3808 that only sees voltage when the reverse light circuit is activated. Once you find that circuit you will want to trace the wiring back somewhere on the door frame side to a place that allows you to easily access it. Most likely this...
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  • Trailer Hitch and Wiring Confirmed as a Fit for a 2016 Chevy Cruze
  • Yes, for trailer wiring the Curt harness part # 56146KIT is confirmed as a fit. This would work well with the Curt hitch part # C11439 which is also a fit for your vehicle. For a ball mount you would want the part # C45521 and then for a hitch ball you would want part # A-82 for a 2 inch ball or part # A-80 for a 1-7/8 inch ball.
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  • Brake Controller and Install Wiring Recommendation for 2010 GMC Acadia with Tow Package
  • To easily install a brake controller in your 2010 GMC Acadia with factory brake controller wiring will only require you to use the proper install harness. For either controller you mentioned all you would need is the pat # 3026-P. Between the Primus IQ # TK90160 and the Voyager # 39510 the Primus would be the better controller as it has a more advanced accelerometer for detecting the amount of braking power needed.
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  • P3 Brake Control Shows No Trailer Connected Even with Trailer Connected to 2002 Ford F-150
  • A brake controller like the P3 # 90195 senses the brake magnets on the trailer when connected to the truck. It is possible that the blue wire (brake output wire from the controller to the trailer) is broken or missing somewhere so it cannot sense the trailer. To test this adjust the controller to the highest setting. Then have someone sit in the truck cab and fully apply the manual override lever while you test the brake output pin in the 7-Way connector at the back of the truck using...
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  • Adding a 7-Way in the Bed of a 1999 GMC 2500
  • To add a 7-Way trailer connector to the bed of your 1999 GMC truck you have some options. First, if the truck came with a factory 7-Way then you can just use # C56080 which will plug into the 7-Way at the rear of the truck. If your truck does not have a 7-Way then you would first need to install one. To do this you can use # ETBC7. For this to install you would need to have a 4-Way flat trailer connector at the back of the truck. If you do not then you can install one, # 118315, and...
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  • What Gauge Wire is Used On Hopkins 4-Way Flat Trailer Connector w/ LED Test Lights
  • The wires that are used on the Hopkins 4-Way Flat Trailer Connector, part # HM48133. The white ground wire is a 16-gauge wire and the balance of the wires on the harness are 18-gauge.
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  • Adding 4- to 7-Way Adapters on a 2000 Toyota Tundra and 2013 Toyota Sienna with 4-Ways
  • Adapter # 118709 is probably not the adapter you need. It would plug into a 7-Way round pin connector on the tow vehicle and allow you to plug in a trailer that has a 4-Way flat connector. Since both of your tow vehicles have a 4-Way flat you will need different adapters. Also, there are 2 kids of 7-Way connectors. One has round pins like # PK11720 and the other, much more common and probably what the trailer will plug into, is a blade style like # PK11893. If the trailer has a 7-Way...
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  • Why Does the Running Light Circuit of a 4-Way Go to Both Sides of Trailer
  • The brown wire of a 4-way connector is the running light circuit which goes to both sides of a trailer since that circuit is used for both taillights. What most people do is run the wires for both sides of the trailer to a single butt connector like # 05732-2 and then run a single wire back from there to the single brown wire on the 4-way. Some 4-ways have what's called a wishboned running light circuit like part # A35W42B which basically has two running light(brown) wires.
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  • Would a Boat Trailer Have a 7-Way Harness with only 5 Wires Ran to it
  • It is very possible that your trailer has a 7-way harness installed on it and not all of the circuits are completed. For a 7-way and lead that is 4 feet long you would want the part # H20043. Then for a new junction box we have the # 38656. I attached an install video for you to check out as well.
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  • Recommended 7-Way Trailer Wiring Harness For 2007 Volvo V70
  • We do not have an adapter that will work with the 7-way European connector you have on your V70 but I do have a solution for you. You can retain the connector you currently have and install new wiring for your trailer. I first recommend the ZCI Circuit Protected Vehicle Wiring Harness, part # 119250KIT. This system includes the circuit tester you can use to identify the wires you attach to by function. You do not have to cut the wires when installing so no issues with that. You will...
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  • Replacement 7-Way Socket Recommendation for a 2011 Ford F-250
  • The 7-way connector you have on your 2011 Ford F-250 would plug right into the Replacement 7-way part # PK11893 that you referenced. All of the circuits of the 7-way match what you see in the diagram I attached that you also referenced.
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  • Troubleshooting Trailer Turn Signals Not Functioning on a Nissan Frontier
  • Most likely you have a some missing or blown relays on your Nissan Frontier as this is a fairly common issue. The relays are available individually as part # 38666-1. The blue relays control the turn signals, and it sounds like that's what you're missing. I've linked you to a photo showing where the relays are usually located, and also to a video showing the same thing.
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  • Wiring Harness Recommendation For a 2016 BMW X5
  • We can't offer you anyway to turn off your back up sensors. Typically most vehicles have the ability to turn them off or mute them so that you can tow a trailer without having to hear them go off. I would be pretty surprised if BMW didn't have something similar that didn't require reprogramming. The install harness I recommend for newer expensive vehicles is the ZCI part # 119250KIT. This harness does not splice in to the wiring of your taillights at all and simply uses sensors that...
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  • Why Would 7-Way Unplug While Towing with a 2015 Chevy Silverado 1500
  • Are you sure you don't have a long enough trailer wiring harness? We haven't had any issues with 7-ways pulling out of the # HM40975 that is the same connector as what you have on your 2015 Chevy Silverado. That makes me think you just may have too short of a harness. Plus, we don't offer a 7-way that will fit the opening on your vehicle that opens up instead of down. For an 11 foot 7-way plug and lead you would want the part # HM20048.
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  • Replacement 6-Way Square Connectors for a Jayco Pop Up Camper
  • Sounds like you are looking for the part # 37995. This is a pair of 6-way connectors that Jayco uses on their pop-ups.
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  • 4-Way to 5-Way Adapter Recommendation for Activating Reverse Lock Out Solenoid
  • We have just what you would need. To convert your 4-way to a 5-way so that you can run the reverse light circuit all you would need is the # 47515. This will tap into the reverse light circuit of the vehicle and give you the 5th circuit needed to activate your trailer's reverse lockout.
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  • Front Clearance/Side Marker Lights Don't Work But All Other Trailer Lights Do Work
  • The rusted ground location could create a weak ground so that some of the lights (usually the ones closest) could still work but others may not so it is worth cleaning away any corrosion. On the wire you mentioned that was exposed that you then taped corrosion could have gotten in and/or there could be other unseen damage. If you were to disconnect some of the lights attached to the running light circuit and that causes those front clearance/running lights to start working then the issue...
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  • Troubleshooting 6-Way Trailer Wiring That Displays Constant Power on Trailer Brake Circuit
  • A 6-way trailer connector can be wired in one of two ways. One way is to have the center pin wired to carry the +12V trailer power feed. The other is to have the center pin carry the trailer brake circuit. It sounds like you may have a vehicle and trailer that do not share the same wiring configuration. If this is the case you can install a vehicle side socket like # PK11609 and wire it to match the pin assignments on the trailer. An article on trailer wiring is linked for reference. Another...
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  • Voltage Drops at Clearance Lights on Aluminum Cattle Trailer with 25 Clearance Lights
  • You have a lot of lights on your trailer drawing power from the running light circuit. As long as the lights are lighting up properly there is no reason worry and you can switch out LED lights a little at a time. If the lights are dim then the combined power draw is likely too much for the tow package wiring on the tow vehicle to handle. Usually when this is the problem it will blow a fuse on the tow vehicle. You can check the wiring for each of the lights to make sure that they are...
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  • 4-Way Trailer Wiring Harness Recommendation for a 2014 Honda Pilot
  • I have a much better solution to install a 4-way on your 2014 Honda Pilot, but if you really wanted to you could hardwire the part # 56146 to it. Instead I would recommend the Tow Ready harness part # 118558 that is custom designed to fit your vehicle and provide it with a 4-way.
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  • One of Four Trailer Brakes Won't Release when Plugged Into a 2005 Chevy Silverado
  • It sounds like there is a short somewhere that is causing constant power draw. There are a few common places to start looking. Corrosion in or on the vehicle and trailer side connectors could potentially cause this issue but normally you would see more than one brake stuck. Still it is worth cleaning away any corrosion. On the trailer side make sure all the wiring to and from the brake magnets is in good shape with no pinched or damaged wires. Fix any damaged wires as needed. If the...
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  • Will Hopkins Wiring Harness with 4-Pole Flat Trailer Connector Plug Into a Hopkins 4/7-Way Connector
  • Yes, the Hopkins Wiring Harness with 4-Pole Flat Trailer Connector # HM38168 will plug into the 4-Way receptacle on your truck. Sometimes we see some compatibility issues with 4-Way flat connectors but it is rare and you would not have to worry about that since both this part and the 4-Way on your truck are made by Hopkins. I have included a link to a video review of the 4-Way for you.
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  • Trailer Wiring Harness Recommendation for a 2005 Saturn Vue
  • The recommended trailer wiring harnesses for your 2005 Saturn Vue are ones with converter boxes like the part # 118418. That being said our installer was able to find a way to wire in the part # 18002 to a 2004 Vue similar to yours. This isn't the ideal solution, but it would work if you used the install video as a guide. I attached install videos for both harnesses for you to check out.
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  • 2016 Toyota Tacoma TRD Sport 7-Way Recommendation to Fit Bumper Cut Out
  • You are on the right track for sure to install the # HM40975-11998. You would first need to start with a 4-way like part # C56282 and then to convert it to a 7-way you would need to cut off the 4-way of this hardwire and then hardwire it to the part # HM40975-11998.
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  • Can Hopkins Multi-Tow Trailer Connector Adapter HM47675 Deliver Lights and 12V Power Simultaneously
  • The 12V power circuit on a 7-way trailer connector is separate from the lighting circuits. If you use an adapter like the Hopkins Multi-Tow Trailer Connector Adapter # HM47675 the 4-and-5-pole connector will carry the stop/turn/tail light signals for the trailer lights while the 12V power outlet will deliver a maintenance-level charge to keep a charged battery topped off. Both will operate at the same time. Do note that this 12V power feed, which comes through your F-150's trailer wiring,...
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  • Can the Pollak Trailer Connector Adapter PK12-724 Be Used Unmounted
  • If you didn't want to permanently mount the # PK12-724 you could easily leave it hanging. As long as it doesn't drag the ground when traveling you would be fine.
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  • Is the 25 ft. Wishbone 5-Way Trailer Harness Compatible with LED Taillights
  • Yes, the 25 foot 5-way harness part # A25W5B that you referenced is perfectly compatible with LED taillights.
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  • Adding a 7-Way Trailer Connector to the Bed of a 1997 Ford F-350 for a 5th Wheel Trailer
  • We do have the parts needed to add a 7-Way trailer connector to the bed of your 1997 Ford F-350. To determine exactly what you will need we have to first look at what type of trailer connector, if any, is on your truck. If it came with a factory installed 7-Way at the bumper check to see if you can unplug a round connector from the back of the 7-Way socket. There may be some locking tabs that you have to disengage to disconnect it. If it is set up that way and the connector is round...
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  • Installation of Trailer Connector Adapter w/ Lamp-Out Sensor Bypass with RF Brake Controller
  • I spoke to my contact at Cequent, the manufacture of both the RF brake controller # 90250 and the Sensor Bypass # 20142, and he informed me that you will need to insert the bypass into the vehicle end plug. It will not work properly being inserted into the brake controller plug. He also told me that the RF does not have the resistors in it, so you will need the bypass # 20142 to have your LED lights work. The lamp-out sensor bypass does have the resistors built into the unit. Bypass...
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  • Usable Length of Wesbar 787196 7-way to 5-Pole Flat Wiring Adapter Cable
  • The Wesbar Coiled 7-Way Adapter # 787196 measures about 11-inches long when not stretched, and 8-feet at absolute maximum. A comfortable length range for using this wiring item is 3 to 4 feet, which will avoid putting lots of tension on it. Keep in mind also that the cable is going to loosen up a little as you use it. It will naturally be more inclined to stretch in warmer weather than in cold.
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  • What Size are the Wire Studs in the Junction Box Included with Trailer Wiring 7-Way Upgrade Kit
  • I went out to the warehouse to measure the studs on the junction box that comes with Trailer Wiring 7-Way Upgrade Kit # ET7WK. The studs are 3/16 inch. The kit does also include the appropriate size nuts as well as 3/16 and 1/4 ring terminals. I have linked a video showing an example installation for you.
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  • Solution for Trailer Wiring Harness on a 2008 Ford F-150 With Dead CIRCUIT at Fuse Slots
  • If there isn't power to either side of the fuse slots on your truck when the blinker is on that is not a great sign. That would indicate a much larger problem upstream of the fuse box. To save yourself the headache, you might just bypass the factory 4-way by installing a part # 18252 which would just hardwire to your truck's wiring.
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  • Availability of Just 4-Way Connectors
  • What harness are you looking for? Like a 4-way that comes on part # 002220? We have the part # 48195 as well or the part # 9653P that comes with both sides plus wiring if needed. You would just cut the middle of the wiring and would have wire for both sides.
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  • Fit and Compatibility of MaxxTow Trailer Connector on a 2014 Chevrolet Tahoe with a 7-way
  • If your 7-way on your 2014 Chevrolet Tahoe is a 7 blade style RV standard connector, which is most common on these vehicles (my cousin actually has this exact make and model), then the MaxxTow Trailer Connector # MT70086 will work great. The easiest way to be able to tell which 7-way you have is to use a circuit tester like # 3808 to test the functions that are coming out of the vehicle end plug. I have attached an image of the correct functions for the RV style 7-way connector. I...
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  • How Long is the Wiring of the Truck Bed 7-way Harness # 22550
  • I spoke with my contact at Tekonsha and he said that the part # 22550 has plenty of wire for your long bed 2003 Dodge Ram 3500 long bed. This harness has 25 feet of wire from module to lead of wire to battery, 7 feet of wire from module to 7 pin connector, 6 feet of wiring from module to passenger side wiring and 14 feet of wire to go from module to driver side.
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  • How to Know if the Curt Trailer Connector for Ford and GM Trucks - Backup Alarm Will Fit a Vehicle
  • If your Ford E-350 has a 7-way on it currently that uses a harness that looks like what you see in the picture I attached the part # C57101 is going to work. Nearly all 7-way harnesses use this same style of connector so there is a good chance this would work.
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  • 7-Way and Brake Controller for 2005 Chevrolet Silverado
  • We can help you with 7-way wiring and a brake controller for your 2005 Silverado. Your truck should already have wiring run for a 7-way; this is likely to be found tucked up above the spare tire. If you find blunt-cut wires there you will use part # PK11898. If you instead find a round U.S. Car connector then you will use part # 30955. Both of these options give you a 7-way socket on the vehicle. For a brake controller I recommend the highly-rated and easy-to-use Prodigy P2 # 90885....
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  • Activating 12 Volt Accessory Circuit of 7-Way on a 2015 Ford F-350
  • I can help you power the 12 volt accessory circuit of your 7-way, but the circuit you described that has voltage when the brakes are applied is not the one to use. You would need to run a 10 gauge wire like part # 10-1-1 to the positive post of your battery through a circuit breaker like part # 9510 from the 1:00 pin on the connector as you are facing the opening of the connector. I attached a picture that shows the pin diagram for the 7-way for you to check out as well.
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  • 2014 VW Tiguan 4-Way Trailer Wiring Harness Recommendation
  • I wish we had an OEM style trailer wiring harness for your 2014 Tiguan, but nothing we offer will fit that connector you described. We have a 4-way harness that will plug in line with the tailligths of your vehicle though. The part # 118675 will easily install by plugging inline with the taillight harnesses of the Tiguan that I described.
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  • Mounting Bracket Recommendation for a Hopkins Endurance Quick-Fix 4-Way HM48190
  • The # HM48190 is a pretty large connector that most traditional brackets won't quite fit into, but you could use the magnetic bracket part # 38095. You would just use the bracket to grab just the wires before the 4-way and it would be secured. I attached an install video for this bracket for you to check out as well.
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  • 7-Way Wire Bundle Recommendation to go With Heavy Duty 7-Way Connector PK11700
  • For a jacketed bundle of 7-wires sold by the foot to go with the part # PK11700 you would want the part # DW04914-1 which is sold by the foot.
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  • Repairing Ground Problem on Trailer With Tilting Bed
  • You do indeed have a ground problem, but no worries-we can get you through this! A trailer with a tilting bed will typically use a bolt on each side as a pivot which allows the tilting portion of the trailer to move. When the trailer is new, the pivoting mechanism fits together tightly and everything works great. Over time, this connection gets a little loose, and doesn't provide a consistent ground connection. Since trailers use the frame as the ground circuit instead of a separate...
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  • Troubleshooting Left Trailer Running Light That Does Not Work
  • Thank you for the photo of your trailer's 7-way plug, which appears to be in good condition (no signs of discoloration or corrosion that could be causing a signal transmission problem). On a 7-way plug like yours there is one contact that handles running lights for BOTH sides of the trailer and this contact is noted by the arrow which I added to your photo. Since the running lights are working properly on the left side of the trailer, the things you can check first in your troubleshooting...
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  • How to Gain Access to Pins on Pollak 6-Pole Round Pin Trailer Wiring Socket PK11609
  • The Pollak 6-Pole Round Pin Trailer Wiring Socket # PK11609 does have a small Philips type screw to hold the rear collar in place. You will need to remove this screw completely and pull/twist the collar to remove it for access to the pins for attaching your wiring. Don't feel bad...it is always smarter to ask a question than not.
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  • Does Wiring Harness Installed On 2015 Sprinter Draw Battery Power When Not Being Used
  • If you have your trailer disconnected from the trailer connector on your Sprinter the power loss will be no factor. I do recommend disconnecting a trailer when you are not using it so there would be no draw at all. I also recommend keeping the connector clean and free of debris and moisture by using some dielectric grease like part # 11755.
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  • Troubleshooting Trailer Brake Controller That Outputs 4 Volts with No Brake and No Manual Override
  • If you are testing at your vehicle's 7-way and are detecting just over 4 volts on the brake circuit when neither the brake pedal nor manual override are engaged then you may have a bad controller, or you could have a short in your trailer socket that is allowing the 12V power circuit to bleed over to the brake circuit. Carefully inspect the 7-way (inside and out) for signs of corrosive build-up that could be bridging circuits. If you are testing the controller's output on the blue wire...
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  • Troubleshooting Factory Brake Controller On 2009 Ford F-350
  • You can use a voltmeter like part # ALL648349 and do some troubleshooting. Disconnect the trailer from the truck first. Then sever the brake output wire(usually Blue) a few inches from the back of the controller. Use the multimeter on that wire and move the manual override to see what the voltage is. If you only show a couple volts then there is an issue with the brake controller. If it checks out okay then you can reattach the brake wire and move to the trailer connector and check it...
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  • Trailers Electric Brakes Not Functioning, But Show 12V at Brake Signal Wire on Brake Assembly
  • Since full power is reaching your trailer's brakes, but they are not working properly, I recommend checking the ground for each brake assembly. It is important that the brakes are grounded to a clean, bare metal surface of the trailer. Dirt, corrosion, and rust can all interfere with a ground. If they are not already, I recommend grounding all of the brake assemblies to the trailer's main ground. You can use 10 gauge wire # 10-1-1, to route all of the brake assemblies' grounds to the...
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  • 7-Way Recommendation for Bed of 2006 GMC Sierra 2500 for Camper
  • You would want to install a 7-way in the bed of your truck to connect to the camper trailer connector. For that the part # 41157 would be a great option that would work well. I attached an install video for this on a similar GM truck as yours for you to check out as well.
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  • Recommended 5th Wheel Truck Bed Wiring Harness for 2004 Ford F-250 Crew Cab
  • The correct Hopkins wiring harness for your 2004 Ford F-250 Crew Cab is the # 40167. This will have the correct connectors to adapt your factory 7-way on your F-250 to provide you with a 7-way in the bed of your truck too. The # HM40147 you were looking at is designed for the F-150 models. I have linked an installation video of this connector being installed for your convenience.
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  • Parts Needed to Add Brakes to a 1995 Jayco Camper 1005
  • We have just what you would need. Thanks for getting me the bearing information as that allowed me to piece together what hub you would need. For a hub and drum you would want the part # 8-173-16UC3. This will fit your spindle and wheels as it has a 4 on 4 inch bolt pattern. For brake assemblies you would want the part # 23-48 for the right hand side and part # 23-47 for the left hand side. For a breakaway kit you would want the part # 20099. For a brake controller I would recommend...
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  • Will the 4 Pole to 6 Pole to 4 Pole Trailer Wiring Adapter Work For My Trailer
  • The Hopkins 4 Pole to 6 Pole Trailer Wiring Adapter # 37175 will work to connect your vehicle wiring to your trailer wiring. However, you will need the Wiring Kit for Brake Controllers # 5506 to make the adapter fully functional. The 6-way adapter has three wire leads: the blue is for electric brakes, the red wire is the hot lead and the white wire is the ground wire. I attached installation videos of the wiring adapter and wiring kit you may want to check out. There are two standard...
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  • Trailer Wiring for 2011 Mercedes Benz E350 4Matic Wagon
  • We have two different trailer wiring harness recommendations for a 2011 Mercedes-Benz E350 Wagon. One would be the Curt # C59236 you mentioned, the other would be the # 119250KIT from Tekonsha. Both harnesses would need to be wired directly into the taillight wiring of the vehicle, but while the Curt harness would require splicing into the existing wiring, the Tekonsha ZCI wiring harness # 119250KIT features sensors that would clamp over the wires without piercing them. I like the fact...
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  • Recommended 7-Way Wiring Components for 2002 Coleman Pop-Up Camper
  • We do offer wiring adapters that allow connection of different formats of trailer wiring, but these are not the best long-term solution. Adapters add connection points, which bring the potential for problems, so the best option for trouble-free wiring is to swap out the 6-pin connector on the Coleman for a 7-way plug like # H20044. All you need is a wiring junction box like # 38656 and ring terminals for making the internal connections from the new plug and the trailer's existing wiring. You...
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  • Is the MaxxTow Trailer Connector Adapter MT70086 Missing Ground Circuit
  • Actually the ground is the in in the 5:00 position and not the 7:00 position so the part # MT70086 does have a ground circuit. I attached a picture that shows the circuits on a 7-way all labeled.
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