Select Your Vehicle

View Cart


Filter Questions and Answers:


reset filter

Expert Answers about Wiring


  • Wire Gauge Sizes in Epicord 7-Way Molded Trailer Plug with Junction Box
  • The wire gauges in the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 are as follows: White = 10 Black = 10 Yellow = 14 Green = 14 Red = 14 Brown = 14 Blue = 12 This trailer connector has RV standard wiring. The functions are labeled at the posts in the junction box.
    view full answer...

  • Trailer Brakes Lock Up When 2016 Jeep Grand Cherokee is In Reverse
  • My first question is does the trailer have electric brakes or hydraulic surge brakes? If it has surge brakes and an electric reverse lockout then that would mean that the center pin on your 2016 Jeep Grand Cherokee is not connected to a reverse light circuit. If it has electric brakes then the brake output circuit on the trailer is connected to the center pin. To fix this problem you just have to have the right wires going to the right pins on both the vehicle side and trailer side connectors....
    view full answer...

  • Troubleshooting Trailer Lights That Won't Work When Vehicle Headlights Are On
  • When strange things happen to trailer lighting very often the cause is simply a weak ground connection at the vehicle wiring harness or at the trailer's main wiring ground. A weak ground will allow certain light functions to work properly while others will not. Usually the problem shows up when you turn on the tow vehicle headlights; this activates the trailer running lights which tend to draw the most current (since they remain on continuously). Check the white ground wire on your...
    view full answer...

  • 7-Way to 4-Way Trailer Adapter Recommendation for a 2007 Toyota Tacoma
  • Sounds like you have a 7-way installed at the rear of your 2007 Toyota Tacoma like the # 37185 and would need an adapter like the part # PK12716 to give you a 4 way. Check out the install video I attached for more info as well.
    view full answer...

  • Trailer 7-Way Connector Tester Recommendation
  • We do have the Hopkins Trailer Connector tester part # HM50928 which will allow you to plug your trailer's 7-way into it and test all of the circuits easily. I attached a review video for this product for you to check out as well.
    view full answer...

  • Parts Needed to Install Brake Controller On 1996 Ford F150 w/ 4-Pole Trailer Conenctor
  • I'm not able to access your shopping cart, but I am able to see the various products you checked out before you submitted your question, and I'd be happy to run through everything with you. For a brake controller, the Tekonsha Prodigy P2, part # 90885 would be an excellent choice. The P2 provides safe and predictable braking in a unit that's easy to set up and easy to use. You'll need the # 3035-P brake control wiring adapter which will allow you to plug the controller in under the dash. At...
    view full answer...

  • Troubleshooting Trailer Wiring that Stops Working When Headlights are Turned On
  • Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem.
    view full answer...

  • Can a 4-Way Be Wired to a Trailer with 3 White Wires
  • Based on the colors of the wires you have you could pretty easily wire a 4-way to your trailer. The part # A35W42B would work well. You would just need to match the colors of the connector to the wiring of your trailer. All of the whites would need to run to the single white wire of the 4-way but the rest of the wires would match right up. The white is ground. The brown is running light. The green is right turn/stop. The yellow is left turn/stop.
    view full answer...

  • What Type of Power Cord Attaches to the Epicord 30 Amp Twist Lock Power Inlet # 277-000137
  • Based on what you described it sounds like your trailer has a 30 amp power cord like what the Epicord 30 Amp Twist Lock Power Inlet # 277-000137 is designed to attach to. I attached a picture of the what is designed to attach to the # 277-000137 for you to check out as well.
    view full answer...

  • Troubleshooting Trailer Lights Not Functioning Properly, Only Right Side Light Comes On
  • It sounds like your issues are the results of a grounding or incorrect wiring issue on your trailer, but we can run through a few tests to be sure this is the cause of the problem. Let's start by testing the new 4-Way wiring connector, like # 18004 that you referenced, on your vehicle. You can use a circuit tester like # 40376 to test for correct function at the connector. The green wire should carry the right turn and stop signal, the yellow wire carries the left turn and stop signal,...
    view full answer...

  • Difference Between Hopkins 4 Pole to 6 Way Trailer Connector Adapter 37175 and 47175
  • There is no difference between the # 37175 and the 47175, it's the same exact part. Our part number for the Hopkins 4 pole to 6 way trailer connector adapter is # 37175, and Hopkins uses 47175 as the part number.
    view full answer...

  • Troubleshooting Trailer Using 6-Way to 7-Way Adapter Where Brakes Are Always Locked Up
  • This is a fairly common issue when there is a 6-way trailer connector involved. The problem is that there is two ways that a 6-way will get wired and the only difference between the two is that the brake output and 12 volt accessory circuit are swapped. This causes the brakes to lock up whenever the towing setup doesn't use the same wiring setup for both the vehicle and trailer. On the trailer you will want to cut the wires on the center pin and 2:00 pin and run them to the opposite...
    view full answer...

  • Troubleshooting Wiring On 2014 Ford F-150 When Backup Camera Is Not Working
  • It sounds like you have a wiring issue on your truck somewhere. Since you said you are getting very little current when you test the reverse pin on your 7-way connector that would be where you want to start. Use a circuit tester like part # 3808 to check the power going into the 7-way connector on the truck side. If it still reads very little as you said then it is further upstream in the wiring. It could also be a ground that is loose. Look for signs of corrosion or a pinched or broken...
    view full answer...

  • Recommended Diode And Switch To Operate Interior Trailer Light When Not Attached To Truck
  • I assume you want to have the lights work as they have with the truck attached and then you want to be able to turn the lights on when the trailer is not attached to the truck. I have attached a drawing that shows how the wiring can be run to give you that option. I recommend a toggle switch like part # PK33300 and also a wiring diode like part # RM-790. You can use 16-ga wire like part # 16-1-1 for this. The # 16-1-1 is sold by the foot.
    view full answer...

  • Wire Functions/Locations for a Trailer Side 6-Way Connector
  • GD is ground LT is left turn/brake lights RT is right turn/brake lights TM is tail lights AS is likely auxiliary 12 volt power which was probably used to run the pump I have also included a picture that shows the basic layout of a 6-Way connector, trailer side. Please note that in some situations the brake and 12 volt power circuits are switched.
    view full answer...

  • Recommended Replacement Molded 7-Way Trailer Connector
  • The replacement trailer 7-way plug I recommend is a Hopkins product. We offer the 8-foot trailer connector # H20046 as well as other lengths you can see by clicking on the page link provided. These Hopkins molded plugs use a superior contact design that tends to have fewer problems than others. You may need a junction box like # 38656 and ring terminals like # DW05702-1 and # 44-5310A for wiring in the new trailer-side plug. Dielectric grease like # 11755 applied to the ring terminals...
    view full answer...

  • What Kind of Trailer Wiring Harness Carries 12V Power for 2016 BMW X3
  • The type of wiring harness installed determines whether it will carry a 12V auxiliary power signal. The trailer wiring we offer for the 2016 BMW X3 is a 4-pole flat type setup like # 119190KIT that carries only lighting signals (stop/turn/tail). If on the other hand your dealership installed a 7-way type trailer socket, this is designed to carry all of the lighting signals carried on the 4-pole plus up to three additional circuits, usually used for reverse lights, trailer brakes and...
    view full answer...

  • Trailer Wiring Recommendation for a 2004 Ford Crown Victoria
  • The only option we have for trailer wiring for your 2004 Ford Crown Victoria is a hardwire option like part # 46255. Or if you didn't want to splice any wires into your vehicle taillights you could use the zero contact kit part # 119250KIT that uses sensors to detect the vehicle taillight wiring instead of having to splice into them. You will still need to run a power wire up to the vehicle battery though.
    view full answer...

  • Wiring Harness for a Superwinch LP10000 Electric Winch at the Back of a 2009 Ford F-350
  • There are some different ways that you could power your Superwinch electric winch on your 2009 Ford F-350. Tow package wiring won't have the proper rating for the winch under load so what I recommend winch wiring kit # SW2008 for up to 16.5K winches. I have linked a video showing an example installation using this wiring kit.
    view full answer...

  • Parts Needed to Install a 7-Way on a 2011 Honda Pilot with a 4-Way
  • If you only need taillight functions (no trailer brakes), all you would need to convert the 4-way to a 7-way would be the # 37185 which is a simple 4-way to 7-way converter. If you want a fully functional 7-way at the rear of your 2011 Honda Pilot you would need to go with the # 56097 instead. This comes with several components you would already have, but this is the only way this is offered.
    view full answer...

  • Will a Circuit Tester Trick Brake Controller into Showing Connection to Test for Output Circuit
  • Normally a circuit tester puts enough load on a brake output pin to allow it to think that a trailer is connected. But if yours is saying no trailer connected while testing yours it's not going to apply any voltage. You might try the manual override of the controller as that still may work. But that being said, your truck is brand new and I am sure the controller is working fine (assuming nothing happened to it) so I would just try connecting to a trailer and see if it works. I would...
    view full answer...

  • Is Wiring Adapter Available to Connect 4-Flat and 4-Round to 7-Way Vehicle End Connector
  • I have a couple of solutions for you, but there is no adapter available that will allow you to connect both the 4-Way flat and 4-Round connectors to your motor home's 7-Way blade-style connector. If local laws don't require you to use both the lights on the tow dolly as well as additional lights, I recommend only using the lights that will be most visible on the road, likely the additional taillights. We have one wiring adapter that will allow you to connect the 7-Way blade-style connector...
    view full answer...

  • Replacement 7-Way Trailer Connector for 2001 Ford F250
  • Since you're needing everything from the rectangular connector back, we have exactly what you're looking for. You'll need the Tow Ready # 118243. Once you unplug the existing gray plug, this connector assembly will take its place. I've also linked you to an install video. You'd then use an adapter like # PK12716 if you needed to tow a trailer that had a 4 pole trailer connector.
    view full answer...

  • Will Hopkins Heavy-Duty Trailer Coiled Wire Adapter for 7-Way to 4-Wire Flat Fit 2015 Jeep Cherokee
  • If your 2015 Jeep Cherokee Trailhawk has a 7-Way trailer connector on it then yes, the Hopkins Heavy-Duty Trailer Coiled Wire Adapter # HM47065 will plug right in and provide some extension and a 4-Way flat to plug in a trailer. I have linked a video review of this adapter for you. We have a lot of 7- to 4-Way adapters. Some have an extension and some do not. I have included a link to the options for you.
    view full answer...

  • Recommended Trailer Hitch And Trailer Wiring Harness For 2005 Volkswagen Passat Wagon
  • I strongly recommend not using either the trailer hitch or the wiring kit you got from the scrap yard. You doo not know if the hitch was involved in an accident or not. There can be stress on the metal that is not visible to the naked eye and would be unsafe. Since all of the trailer wiring kits have a powered converter for your 2005 Passat, you must have the black power wire present and run to the battery for the kit to work. I recommend purchasing a kit that is designed for your specific...
    view full answer...

  • Trailer Wiring Harness Options for a 2003 Ford Windstar SEL
  • Hopkins trailer wiring harness # HM48895 is compatible with both LED lights and regular incandescent bulbs on the vehicle or trailer so it will work with either system but it may not work with your 2003 Ford Windstar. The 2003 Ford Windstar has what is called a low-side switch for the brake circuit and not straight 12 volt power like other vehicles. There are vehicle specific trailer wiring harnesses that will fit your 2003 Ford Windstar and I have included a link to them for you. For...
    view full answer...

  • How to Install Hopkins Universal Trailer Wiring Harness on a 2011 Mercury Grand Marquis
  • Universal trailer wiring harnesses such as # 46255 do not have vehicle specific installation instructions but it isn't difficult to install this harness. All you will have to do is determine the functions of the vehicle tail light wiring using a circuit tester such as # 3808 or a meter if you have one. On the harness, the white wire is ground. Attach it to a clean bare metal surface. The yellow wire will go to the left turn signal/brake light wire on your 2011 Mercury Grand Marquis....
    view full answer...

  • Adding 4-Way to 2013 Chevy Silverado that Already has 7-Way Connector and Using Both at Same Time
  • For your 2013 Chevy Silverado with 7-Way trailer connector I recommend adding 4-Way # 118384 which will Tee in line with the 7-Way wiring allowing you to have both a function 4-Way and 7-Way connector. Please keep in mind that you can use both at the same time but they are drawing power from the same source. If the amount of power draw is too much it could blow tow package fuses. We used to have an adapter that plugged into a 7-Way and had a 7-Way and 4-Way on the output side but...
    view full answer...

  • Compatibility of 30104 4-Pole to 6-Way Square Trailer Connector Adapter with Motorcycle Trailer
  • Jayco used a proprietary plug on some of its trailers, which is what the # 30104 was designed for. Are you sure your trailer doesn't use a different square 6-pin connector, like part # 37995? Since the 6 pin square trailer connector is pretty much obsolete at this point, it wouldn't be a bad idea to replace the connector with something more common. The # 30104 only provides the 4 lighting circuits to the trailer (ground, right turn/brake lamp, left turn/brake lamp and running lamps)...
    view full answer...

  • Protecting Trailer's 7-way Trailer Connector from Moisture
  • Surprisingly enough, we don't offer a cap that would slip over the 7-way connector on your trailer and protect the contacts from the elements. A light coat of dielectric grease, part # 11755 would act to exclude moisture form the connector. To protect the connector, I've seen folks simply use a ziplock bag and a rubber band to secure it. It's not the most elegant solution, but it's inexpensive and it works.
    view full answer...

  • Trailer Wiring Recommendation for a 2004 Volkswagen Passat
  • For your 2004 Volkswagen Passat we have trailer wiring options but they are all hardwire kits like the part # 119147KIT that require you to test the wires of your vehicle taillight harness and then splice the wires of the kit to them. This kit is confirmed as a fit for your vehicle and comes with a circuit tester to help you wire it in.
    view full answer...

  • Parts Needed to Make a Coiled 6-Way Square to 7-Way Blade Adapter
  • Yes, when making the adapter if you wanted to use the coiled part # 54006-044 instead of the part # H20042 that is straight you certainly could. Either would work well with the part # 37995 to make the needed adapter.
    view full answer...

  • Adapting a 4-Way Flat Connector on a Vehicle to Tow a Trailer with a 7-Way Connector
  • Pollak adapter # PK12716 would not work but we do have what you will need. You need a 4-Way to 7-Way adapter # 37185. If you just need the lighting functions to work on the trailer then all you would do is plug your 4-Way into this adapter and ground the white wire to the vehicle frame. If you need to have functioning electric brakes, 12 volt power, and/or reverse lights active for the trailer then instead of # 37185 you will need # ETBC7 and a brake controller (to control electric brakes,...
    view full answer...

  • Troubleshooting Trailer Brakes That Lock Up with Trailer Disconnected from Tow Vehicle
  • If your trailer's electric drum brakes are locking up even when the trailer is disconnected from the tow vehicle then it sounds like the battery on the trailer is somehow finding a connection to the brake circuit. This could be from something as simple as a case of corrosion in the trailer connector to damaged/shorted wiring along the trailer frame. Please refer to the linked article on trailer wiring for images of the 7-way RV-style plugs typically found on trailers, such as # H20046...
    view full answer...

  • Wiring Adapter to Connect Vehicle 4-Pole to Trailer 6-Pole
  • We do offer adapters to allow you to connect a truck with a 4-pole flat trailer harness to a trailer with a 6-pole connector. These and other formats for trailer wiring are shown in the linked article. Note that there are two types of 6-pole connectors, the round type as on Tow Ready # 30637 and Hopkins # 37175, and the square type as found on Jayco trailers, for which you'd use # 30104. The 4-pole connector on your truck carries only stop, turn and tail light signals. The trailer's...
    view full answer...

  • Parts Needed to Convert 4-Way to 7-Way on 2016 Ford Escape and Activate 12 Volt Accessory Circuit
  • You are on the right track. For a 7-way adapter to convert your 4-way signal you would only need the part # C57674. For the power wire you would need the circuit breaker part # PK54540 that you also referenced ran to the positive post of the battery with 10 gauge wire like the part # 10-1-1 which is sold by the foot.
    view full answer...

  • 4-Way to 7-Way Adapter Recommendation for a Trailer That Does not Have Brakes
  • Since your trailer doesn't have brakes you could use the # HM47200 as an adapter for your 2016 Toyota Highlander. You would just want to tape up the extra wires that wouldn't be used. After that you would just need to plug in the 4-way of the adapter to the 4-way of your vehicle and the 7-way would be ready to plug into the connector on your trailer.
    view full answer...

  • Can a 12 Volt Battery on a Dump Trailer be Charged from a 7-Way Trailer Connector
  • The 12 volt circuit on most 7-Way trailer connectors is fused at 30 amps/12 volts. At best it can provide a maintenance charge to a trailer mounted battery. But it cannot charge up a battery; at least not one that is the size of the battery used to operate functions on a dump trailer. Most vehicle alternators are not strong enough and the tow package wiring not large enough for enough amperage to get back to the battery. I recommend using an AC charger when you can to charge and recondition...
    view full answer...

  • Troubleshooting Trailer Running Lights Not Functioning On a Trailer
  • Try testing the running light pin of the connector on your Ram with a circuit tester like part # 3808 to see if the problem is on the vehicle or the trailer. If the pin isn't active its most likely a blown fuse under the hood of the truck. It could also be that the pin is too corroded or dirty to function properly. You would want to try cleaning it with some fine grit sandpaper or wire brush. I attached a help article that details troubleshooting trailer wiring for you to check out as well.
    view full answer...

  • Replacement 7-Way and Round Connector for a 2005 Ford F-150
  • For a replacement harness that the # PK11893 is designed to plug in to you would want the part # PK11998. You would be able to cut off the damaged harness and wire this is place of it and you would be ready to install the # PK11893. There may be color differences between the wires so you would need to remember where each colored wire went on the old harness when wiring up the new one or wire by function.
    view full answer...

  • Trailer Connector Recommendation 2008 GMC Canyon for Just Taillight Functions
  • For your 2008 GMC Canyon you will need a 4-way trailer connector to provide you with the turn signals and stoplight functions like the part # 118301 which has been confirmed as a fit. You referenced the part # 30717 which would then adapt the 4-way to a 7-way for just taillights if needed. The extra wires wouldn't be used.
    view full answer...

  • What Wiring is Needed for Vehicle to Install 4-way and 7-way for 12 Volt Circuit to be Powered
  • The 4-way trailer harness part # 56146 that you referenced does not carry a 12 volt power circuit for accessories like a fridge so you would not need to do anything extra while installing this to compensate for the fridge. With this installed you would also need the # 37185 which will convert this to a 7-way. You would be able to use a 10 gauge wire like part # 10-1-1 through a circuit breaker like part # 9510 to the positive post of the battery to provide power for accessories like...
    view full answer...

  • Parts Needed for 2005 Ford Ranger to Tow Trailer with Electric Brakes
  • I am happy to help you with the parts needed in order to tow your trailer with electric brakes. You are on the right track with the products that you referenced. Some vehicles allow for custom wiring adapters to install a brake controller, but there is no such wiring harness adapter for your 2005 Ford Ranger. The Ranger does not have a port available under the dash with the functions needed for the brake controller pre-ran. You will want to hardware the installation of the brake controller....
    view full answer...

  • Troubleshooting Malfunctioning Trailer Lights Caused By Poor Ground Connection
  • From what you describe, it sounds like you have a ground problem somewhere in the trailer wiring or on the trailer wiring harness installed on the vehicle. Ground problems will make the trailer lamps do all sorts of wacky things. With the running lights and the brakes on, activating the turn signals will draw maximum amperage through the trailer wiring system. If you have a ground problem, that's when it will typically show itself. Check that the trailer connector on the vehicle is securely...
    view full answer...

  • Brake Controller on 2005 Chevy Silverado Won't Apply Trailer Brakes With Brake Pedal
  • Let's begin by making sure you have the controller wired to the GM brake controller pigtail correctly. The red pigtail wire connects to the black brake controller wire The light blue pigtail wire connects to the red brake controller wire The black pigtail wire connects to the white brake controller wire The blue pigtail wire and the blue brake controller wire attach together If the pigtail is correctly wired to the brake controller, then you'll want to check the CHMSL fuse. This...
    view full answer...

  • 4-Way Trailer Wiring Harness Recommendation for a 2000 Chevy Silverado
  • For your 2000 Chevy Silverado if you do not have any trailer wiring present on your vehicle you will need to hardwire in a 4-way with the part # 119147KIT that has been confirmed as a fit. I wish there was a custom fit plug-in style of connector for your truck, but this will be your only option.
    view full answer...

  • Getting Power to 12-Volt Accessory Pin on 7-Way Trailer Connector
  • To get power to the pin in the 1:00 position of the # PK12703 7-way trailer connector, you'd run a length of 10 gauge wire # 10-1-1 which is sold by the foot from the terminal for the 1:00 pin on the 7-way to the positive battery terminal, via a # 9510 40 amp circuit breaker. You'd need two # DW05741-1 ring terminals to connect to the breaker and a # 44-5356A ring terminal to connect at the battery.
    view full answer...

  • Installation of Hopkins 4-Pole/5-Pole Trailer Adapter 47515 on 2016 Jeep Wrangler Unlimited Sport
  • Auto makers don't always use the same wire colors in vehicle production so color alone is not a reliable method to determine what signal a specific wire is carrying. The surest way to know is to use a circuit tester like # 40376 or # ALL640595 to test the wires at the taillight while a competent helper carefully shifts the vehicle into reverse (with the parking brake on for safety). This will give you 100-percent assurance that you have found the correct wire to connect to the blue wire...
    view full answer...

  • Advice for Rewiring Trailer to Clear Up Wiring Issues Where Brakes Lock Up and Pulsate with Blinker
  • The immediate brake lock up of your trailer brakes that also pulsates with the blinkers is a clear indicator that your turn signal stop light circuit is getting applied to the brake output circuit. You mentioned a separate signal for the brake lights on the black wire of the box. Does your tow vehicle have separate turn signals from stop lights as well? Or is there a converter on your trailer like part # 118158 to convert the signal? Your best option is going to be to use a circuit...
    view full answer...

  • 7-Way Trailer Connector on Newmar Motorhome Missing Pin for 12-Volt Auxiliary Power to Trailer
  • The pins themselves aren't available separately. Your best course of action would be to replace your existing 7-way with one like the # PK11893 you mentioned. The pigtail, part # PK11998 would plug into the back of the replacement connector, and to activate the 12-volt power supply circuit, you'd need to run a length of 10 gauge wire # 10-1-1, which is sold by the foot from the black wire on the pigtail to the positive battery terminal with a 40 amp circuit breaker # 9510 installed inline. Keep...
    view full answer...

  • Recommended 7 Pole to 4 Way Connector Adapter For Chevrolet Traverse To Tow Trailer With 4-Way
  • The adapter I recommend for your Traverse is the Pollak 7 Pole to 4 Way Connector Adapter, part # PK12716. This adapter will allow you to tow a trailer or camper without electrical brakes with your Traverse.
    view full answer...

  • Troubleshooting Brake Controller that Shows Trailer Connection When Not Connected to Trailer
  • Sounds like you have a brake controller that displays an orange color when it senses that a trailer is connected to it. Typically when this is seen it is because there is corrosion on the trailer connectors that causes a slight draw on the output circuit which then tricks the controller into thinking it is connected to a trailer. Corrosion can easily be removed with some fine grit sandpaper or a wire brush. Removing it should fix the issue.
    view full answer...

  • Troubleshooting Trailer Taillights that Stop Working When Brakes are Applied
  • Sounds like you either have a weak ground on your trailer taillights or the lights themselves are drawing too much amperage and it's causing the circuit to just shut off. Typically a fuse would get blown if this were the case so most likely it's a weak ground. Also, be sure to check the function with the engine of the tow vehicle running as the additional amperage of the alternator running will give the trailer circuits a bit more juice.
    view full answer...

  • Is it Normal to Only See 9 Volts on the Output Circuit of a Brake Controller
  • Brake controllers allow you to vary the voltage applied to the trailer brakes to allow for different braking power. If the controller is set to it's max output voltage it should be right at 12 volts. Be sure to have the vehicle running too so that you don't see any voltage drop off just from the alternator. If the controller has it's gain turned all the way up and it's only at 9 volts then that would indicate you have an internal problem and the controller would need to be replaced. I...
    view full answer...

  • Recommended Wiring Harness for Rewiring a 26 Foot Gooseneck Stock Trailer
  • It sounds like you are wanting to rewire your gooseneck trailer with a 7-way connector. To do this I recommend the 7-way connector # H20046, the bonded 16 gauge 4 wire per foot # 16-4B-1 for the trailer and the 10 gauge jacketed wire # 10-2-1 for the brakes and ground. Often times, people will run the wires from a 7-way such as yours to a junction box like part # 38656. From there, they will run the standard wire colors to the trailer lights, brakes and battery. I have attached a...
    view full answer...

  • All Trailer Lights Work Fine Except Brake Lights Will Not Work
  • On a trailer the brake lights and turn signals operate on the same wire/bulb. So it is odd when the turn signals work but the brake lights don't. There are 3 possible causes for this that are more likely than any of the other possible causes. First there could be a problem on the vehicle side. Use a circuit tester such as # 3808 to test the vehicle side trailer connector while someone steps on the brakes in the tow vehicle. If there is no power on any of the pins for this test then there...
    view full answer...

  • Lights Needed on 12 Foot Long x 83 Inches Wide Dump Trailer
  • I can certainly help you find all of the parts needed to rewire your dump trailer and we do have a lighting kit that will work for you. However we do not have any kind of plug-and-play rewiring kit. The taillight kit I recommend for you is the Optronics Waterproof, Over 80 Inch LED Trailer Light Kit with 25 Foot Wiring Harness # TLL16RK. This kit includes 2 red LED taillights with the functions needed for trailers over 80 inches wide. The included wiring harness has 25 feet of wire...
    view full answer...

  • What is the Wire Gauge Used in Hopkins Endurance 4-Way Flat Trailer Connector # HM48110
  • I went out to the warehouse and pulled Hopkins Endurance 4-Way Flat Trailer Connector # HM48110 to measure the wire gauge. The ground wire is 16 gauge and all other wires are 18 gauge. this is adequate for trailer lighting functions since they don't have to carry anything that draws a lot of amperage such as brakes or a 12 volt circuit.
    view full answer...

  • 7-Way to 4-Way Adapter Recommendation to tow Small Rental Trailer
  • Sounds like you have a standard RV 7-way connector like the part # 37185. Are you looking for a 4-way adapter so that you can tow a smaller trailer? If so, you would want the # PK12716. I attached an install video for you to check out as well.
    view full answer...

  • Where to Find Stoplight Switch on 2007 Jeep Liberty for Brake Controller Install
  • On your 2007 Jeep Liberty, If you are referring to the red wire on the brake controller, it attaches to the wire on the stoplight switch that carries a signal only when the brake pedal is pressed. You will need a circuit tester, like the Quickee # 3808, to find this wire. Most likely it's going to be a white wire with a green or tan tracer. See attached install video. Normally you can pretty easily test the wires on the pedal to figure out the correct one. Sometimes you end up having...
    view full answer...

  • No Trailer Brakes With Brake Pedal after Flat Bed Is Installed on 2004 Dodge Ram 3500
  • If you're not getting trailer brakes with the brake pedal, use a circuit tester like # 3808 on the red wire exiting the rear of the brake controller. That circuit should go hot with the brake pedal applied. If you're not getting power on that wire, you likely have a blown fuse on the 3rd stop lamp circuit. It's possible when you removed the original bed, something got shorted and blew the fuse. As far as the vehicle taillights go, they should be wired into the original circuited that...
    view full answer...

  • 7-Way RV-Style Wiring Extension for 2006 Toyota 4Runner
  • The Curt 7-Way Trailer Adapter # C57003 is meant specifically for German auto brands that use light-gauge wiring and LED lighting. This is not recommended for your 4Runner for this reason. If you need a 7-way RV-style wiring extension you can make up one yourself using parts # 50-87-002 (2-feet long) and # A7WCB along with butt connectors like # 05731-5. Or you can simply order part # TLW6021, which is 2-feet long.
    view full answer...

  • 5-Way Replacement Recommendation for a Trailer with 3 Wires Ran to the Ground Circuit
  • The white wires on your connector are the ground wires. What you can do is run all of the ground wires to one wire for the ground on the part # HM47910 and you would be totally fine.
    view full answer...

  • What Gauge Wire is Designed for Use with the Arcon Replacement RV Power Adapter AR18206
  • The # AR18206 is designed to attach to wires with ring terminals so it does not have a gauge wire maximum. As long as you can fit the wire into a ring terminal it would work. This is intended for 10 gauge wire so that would be your best option.
    view full answer...

  • Will Curt Trailer Wiring for a 2015 Acura TLX Short Out
  • The only people that have problems with the Curt trailer wiring part # 56146KIT burning out are the ones who do not properly secure the converter box. If the box comes loose and starts banging around it will eventually burn out. Aside from that it is an excellent option that has been confirmed as a fit for your vehicle. We don't have any confirmed fit T-connector style harnesses for your vehicle so I am not sure if they have your vehicle confused with a different one like a regular TL.
    view full answer...

  • Wiring Adapter Recommendation to go From RV 7-Way to Toad 4-Way for Lighting
  • Sounds like you are asking how to hook up the magnetic tow bar wiring you have to your RV that has a 7-way flat RV connector. Your RV having separate turn signals from stoplights will not be an issue. The 7-way on your RV will already have the turn signal circuits converted to combined so that it matches your tow bar wiring. If you have a 7-way flat connector on your tow vehicle you would want the part # 787196. If your lights have a 4-way round you would need part # HM47043 instead.
    view full answer...

  • Troubleshooting a Trailer Turn Signal Not Illuminating When the Vehicle's Signal Functions Properly
  • Sounds like you might have a short in the wire that is connecting the tail lights to the 7-way. I would start by checking the wires that will be routed from the right turn signal. If there is any pinch or bare wire this could be causing your issue. Another place to check would be the ground wire. You will want to make sure this is a clean and secured against a metal surface for it to function properly. Another possible culprit is the connector itself. I would check the plug for...
    view full answer...

  • Brake Controller Recommendation for a 1967 Chevy Truck
  • You will need to start with a 4-way (if you do not have one). For that you would want the # 18252. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling...
    view full answer...

  • Adapting 5 Pole Flat Trailer Connector on Trailer to 4 Pole Connector on Tow Vehicle
  • It sounds like you're wanting to tow a boat trailer that has an inertia operated surge coupler. All you'd need is a 4 to 5-pole adapter, like part # 20036. The extra blue wire on the vehicle side would tap into the reverse lamp circuit on your vehicle, so that when the vehicle's transmission is placed in reverse, the blue wire powers up and releases a solenoid in the trailer coupler which allows you to back the trailer without the brakes being applied. I've linked you to a video showing...
    view full answer...

  • Taillights Malfunctioning on Trailer Towed By Volvo VHD Dump Truck
  • What kind of trailer are you trying to pull? A commercial dump truck likely uses a 7-way round pin trailer connector which likely has the right turn, left turn and brake signals separated into three circuits. If the trailer combines the brake and turn signal signals onto two circuits, one for right turn/brake one for left turn/brake, then you'll need to install a taillight converter onto the truck. This would explain why you've been having a heckuva time getting your trailer taillights...
    view full answer...

  • Installation Of Trailer Lights And Wiring On Utility Trailer
  • When you are installing a 2-wire light on your trailer and they have a red and a black wire, the black wire will be for the running lights, and the red wire will be for the brake and turn signal function. It sounds like the lights are grounded through the mounting hardware on the trailer frame. I have attached a helpful article that explains how trailer wiring should be run. I have also attached a drawing that shows how wiring is typically run on a trailer you can check out.
    view full answer...

  • How to Open Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector PK12706
  • On the top of the trailer side 7-Way connector # PK12706 there is a small set screw. Use a small flat blade screwdriver to loosen the set screw. It does not have to come all the way out. Once the set screw is loose you can use the screwdriver to push the face of the connector out from the back. You would then run the wiring through the back, make the connections to the terminals on the face part, then push the whole assembly back into the body of the connector. Tighten the set screw...
    view full answer...

  • Recommended Multi-Tow Adapter For Vehicle 7-Way Trailer Connector
  • We do not carry the TC-127 any longer but I may have an adapter that will work for you. I recommend the Hopkins Multi-Tow Trailer Connector Adapter, part # HM47675. This plugs into the 7-way on your vehicle and gives you a 5-way or 4-way and a 12 volt power socket. It does not offer a 7-way but for the 7-way function simply remove the adapter.
    view full answer...

  • Trailer Hitch and Wiring Recommendation for a 2001 Ford F-250 Stake Pocket Truck
  • If there is no trailer wiring at all at the rear of your 2001 Ford F-350 with a stake bed you are going to have to hardwire in a 4-way and then a 7-way adapter after. If there is a 4-way connector currently or you find the square connector that the part # 20031 attaches to you could go that route as well. For a hardwire 4-way you would need the part # 18252. 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....
    view full answer...

  • RV 7-Way to Round 7-Way Adapter Recommendation
  • The part # F77R will plug into the RV style 7-way you have installed on your 2013 Ford F-250 and then will provide you with a 7-way round socket for your trailer to attach to. I attached a review video for you to check out as well.
    view full answer...

  • Trailer Wiring Harness Options for a 2003 Ford Windstar
  • Hopkins tail light converter # HM48895 is a universal fit item so you can use it on your 2003 Ford Windstar. There are other, custom fit options available though. Check the build-date sticker in the door jamb of your Windstar. If it was built before November 2002 you can use # 118366. If it was built after October 2002 then you can use # 118305.
    view full answer...

  • No-Splice Vehicle Trailer Wiring Harness for 2014 Volkswagen Passat
  • The wiring harness option we offer for your 2014 Volkswagen Passat that will not require you to splice into any wires is the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness with 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT. This wiring harness features zero-contact interface sensors that identify current flowing through each wire by simply clamping onto the wire. Since this wiring harness eliminates feedback, interference with, and power draw on your vehicle's...
    view full answer...

  • European 7-Pin to US 4-Way Flat Trailer Wiring Adapter for a Land Rover Defender
  • There is a specific adapter for Land Rovers that have that European 7-Way connector # 118710. One end plugs into the vehicle 7-Way and the other end has a connector for a 4-Way flat connector used on US trailers.
    view full answer...

  • Recommended Brake Controller And Trailer Wiring For 2013 Volkswagen Passat
  • If you do not have a 4-way connector on your Passat that is the first thing you will need. I recommend the Tow Ready Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, part # 119190KIT. I have attached a link to an installation video for this wire harness on a Passat you can check out. The next item you need is part # ETBC7. This plugs into your 4-way trailer connector and with additional wiring gives you the 7-way trailer connector you can use with your trailer. I have attached...
    view full answer...

  • Replacement Wishbone Wesbar 4-Way Harness
  • Sounds like you are looking for the part # W002230. This is a wishbone Wesbar 4-way connector that has two wires for the running light circuit (one for each side of the trailer) and the standard wires beyond that. The white wire is the ground so you would just need to run it to the trailer frame and it would work just fine.
    view full answer...

  • Would the Connectors of the Quick Fix (TM) 4 Pole Flat Car and Trailer Ends Attach to a 5-Way
  • The connectors that come with the part # 48195 are 4-way connectors. A 5-way would mate right up to this connector but the fifth circuit would get dropped off. If you are looking for a replacement set of 5-ways for both your trailer and tow vehicle you would want the part # HM47890.
    view full answer...

  • 7-Way Trailer Wiring Recommendation for a 2015 Ford F-150 with 4-Way
  • I wish there was a simple plug-in option for installing a 7-way on your 2015 Ford F-150 but there isn't at this time. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # 37185 as well as the an install harness for the brake controller like the part # 22292. There are a few connections at the rear of your truck that you would need to make as well. The brake...
    view full answer...

  • Camco Power Grip RV Power Maximizer # CAM55025 Tripping Circuit Breakers
  • According to my Camco rep, if the outlets you were using at the campsites weren't GFI you might be trying to draw too much power which is throwing the breakers. Trying to draw more than 45 amps would throw the breakers. There could also be a short somewhere in the RV wiring that's causing the breakers to blow. I'd recommend making sure every lamp and appliance in the RV is shut off when you plug in. Then, begin turning on things until the circuit breakers blow.
    view full answer...

  • Recommended Wiring Harness for a 2007 VW Passat Wagon
  • We have Tow Ready 4-pole wiring harness # 118530 for your 2007 Volkswagen Passat Wagon. This harness is a powered ModuLite type that isolates and protects the car's wiring from any shorts or other faults in the trailer's wiring. It draws the actual power to operate the trailer lights not through the car's internal wiring but through a separate 12V power wire you connect to the battery. Installation is mostly a plug-in, except for that one power wire that will run from the converter unit...
    view full answer...

  • Availability of 5-Way to 4-Way Adapter
  • Sounds like you may be looking for the part # 47515 as this is basically exactly what you described. I attached an install video for this for you to check out as well.
    view full answer...

  • How to Complete 12 Volt Accessory Circuit of 2011 Acura MDX 7-Way
  • Sounds like the 12 volt accessory circuit of the 7-way on your 2011 Acura MDX is not ran. Is there wire ran to the back of the pin that carries this circuit? This will be the 1:00 position on the 7-way as you look at it from the front. Most likely you will need to run the wire for this circuit. You would need 10 gauge wire like part # 10-1-1 (sold by the foot) and a breaker part # 9510 to complete this circuit.
    view full answer...

  • Availability of 7-Way to 4-Way Adapter that Fits 2003 Toyota 4Runner
  • Yes, the 7-way adapter part # 37385 and # 78118 will both fit the factory 7-way you have on your 2003 Toyota 4Runner. They will simply plug into the 7-way on your vehicle and be ready to go.
    view full answer...

  • Recommended 4-way Connector Needed for Tow Daddy Wiring Harness for Dinghy Towing
  • Sounds like you are looking for the just the Vehicle End 4-way flat trailer connector like the Hopkins # HM48190. This will mate with the Tow Daddy # TD3017S and connect to your male end 4-way plug # RM-300150-00 that you also purchased. If you need a 4-way with a wire lead then the Hidden Hitch # 118603 includes a 60 inch lead and a dust cover for the connector when not in use. I have linked all the above mentioned products to this page for your convenience.
    view full answer...

  • Installation and Fitment of Hopkins 6 Pin Round Connector #H20036
  • I went out to the warehouse and pulled a 6-Way Molded Trailer Wire Connector, # H20036, and used a couple of measuring tools designed to measure wiring sizes. All of the wires were 14 gauge. Yes, this will work as a replacement for the standard Hopkins 6 pin round. You will want to cut the wires at the back of the current 6-way connector on your trailer and wire in the Hopkins 6-Way Molded Connector, # H20036. It is important that the wires on the connector are connected to the trailer...
    view full answer...

  • Replacement 7-Way Socket for 1998 Ford F-150 Factory Trailer Connector
  • You can use Tow Ready Replacement Multi-Tow 7-Way & 4 Pole Trailer Connector # 20119 to replace the factory-installed 7-way blade style connector on your 1998 Ford F-150. This harness uses a round U.S. Car type connector to join the mating connector on your truck's driver-side frame.
    view full answer...

  • Recommended Parts for Re-Wiring 5-Pole Flat Boat Trailer to Match Truck 7-Way Wiring
  • Adapters like # 37385 and # HM47570 are convenient and can work fine for the short-term but for long-term reliability you are really better off replacing the connector on the trailer to a 7-way that matches your truck with no adapters - or their potential problems. Those extra connections can mean more chances for corrosion. You can easily test your truck's 7-way using a circuit tester like # 40376 or # 3808. Have a helper activate each function while you apply the tester to the appropriate...
    view full answer...

  • How to Disconnect Locking Tabs on OEM Wiring Harness on 2004 Ford F-350 Diesel Crew Cab
  • If the OEM wiring harness on your 2004 Ford F-350 Diesel Crew Cab uses square connectors like those on Hopkins harness # 40167 you will need to press in the release tabs in order to disconnect the existing harness. The tab is inside the small channel on the fastener. If you refer to the linked video at the 1:35 mark you will be able to see the tab engage as our technician makes the connection. If the plastic fasteners are factory original, then they may well be less flexible than when...
    view full answer...

  • How to Determine What Extra Wire for Wiring Up 7-Way on a Ford F-350
  • You would need to test the wire with a circuit tester like part # 3808 to determine it's function. It could be a third brake light circuit used for wiring up a camper shell third brake light as that is the most common extra wire found in trailer wiring bundles.
    view full answer...

  • Fifth Wheel Trailer Wiring Recommendation for a 2001 Dodge Ram 2500
  • For trailer wiring that would allow you to install a 7-way in the bed of your 2001 Dodge Ram 2500 you would want the part # C56071 that has been confirmed as a fit. This will plug in-line with the 7-way you have at the rear of your truck and then will provide you with a 7-way to install in the wheel well.
    view full answer...

  • Troubleshooting Trailer Lights Where Brake & Turn Lights Work But Running Lights Do Not Work
  • Your wiring problem does sound like a grounding issue. When some trailer light functions, such as brake lights and turn signals, work but running lights do not, this usually turns out to be related to a weak ground either at the vehicle wiring harness or on the trailer harness. Both ground wires must make a solid connection to a clean bare metal surface. You can clean/sand the grounding point (to remove rust, grease, primer, etc) or you can re-locate the ground wires to new clean spots...
    view full answer...

  • 7-Way to 7-Way Extension for a 2011 Toyota 4Runner
  • We do have some 7-Way to 7-Way extensions such as # 20027 which is 7 feet long. Or you could use # H20043 and attach the wires to the back of a vehicle side 7-Way, # PK12-707E, if you want one that is right at 4 feet long.
    view full answer...

  • Will Hopkins Multi-Tow Trailer Connector # HM47675 and the # HM47570 Fit a 2016 Chevy Tahoe 7-Way
  • Yes, the Hopkins Multi-Tow Trailer Connector # HM47675 and the # HM47570 will both fit the 7-way you have at the rear of your 2016 Chevy Tahoe.
    view full answer...

  • Availability of Replacement 7-Way for Trailer and Tow Vehicle
  • Sounds like you are looking for a replacement 7-way for both the connector on your trailer and your truck. For a standard 7-way for a vehicle the part # PK11893 would be the correct connector. For a replacement 7-way with 8 feet of wire you would want the part # H20046. Using a junction box like the part # 38656 will make install of the 7-way a bit easier. I attached a video that shows how this will be done.
    view full answer...

  • Troubleshooting Trailer Lights Not Working, Except Taillights, with 2002 Ford F-450
  • I recommend beginning by testing your 7-Pin connector on your truck. You will want to use a circuit tester, like # 40376, to ensure the plug has all of the functions working properly. I have attached a help article on trailer wiring that will help you determine the functions of each pin on the connector. If you are not getting signal on all of the pins, you will want to check the fuses for those wires. If a fuse is bad, it will need to be replaced for the function to work properly at...
    view full answer...

  • Using Curt T-Connector Wiring Harness C55504 for Accessing Lighting Functions for Extra Lights
  • If your 2005 Dodge Ram pickup has existing factory trailer wiring, say a 7-way like # 51-97-411 or a 4-pole like # 118381, you can use that trailer connector to access lighting signals for the extra lights you plan to install on your flat bed. If you have no trailer connector you can use the 4-pole harness # C55504 that you referenced; this plugs in at the taillight wiring connectors. Note that in both of these trailer wiring formats the vehicle's stop light and turn signal functions...
    view full answer...







Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email






etrailer.com reviews etrailer.com reviews

All images, layout and content copyright etrailer.com