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Expert Answers about Wiring


  • Electric Brakes On Trailer Working Intermediately With 2006 Mitsubishi Raider
  • According to Hopkins installation manual, the E2 error indicates that there is a blue wire short somewhere in along the trailer wiring or a possible defective magnet in the brake assemblies. First, you will need to check the blue wiring from the brake controller to the the trailer electric brakes. Check your electrical connection between the your vehicle and your trailer. The plug might not be making a secure connecting, causing an intermediate signal. There could be an electrical...
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  • Recommended Wiring To Add Trailer Harness And Brake Controller To 2016 Ford E-450 Cutaway
  • We do not offer any wiring harnesses that are designed for your 2016 E-450. I am afraid any trailer wiring you want to do is going to be a hardwire effort. We do offer universal wiring harnesses that will work for you but you will need to identify the wires for each of the functions by using a circuit tester like part # 3808. You will need to first install a 4-way harness like part # HM48030. You will also need a 7-way connector for the RV so I recommend part # ETBC7. This plugs...
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  • How to Wire Second Axle of Trailer for Brakes
  • Yes, you can jump the front axles brake output circuit to power the rear axle. Check out the picture I attached to see how most people do this.
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  • LED Trailer Lights Stay on When Disconnecting from Tow Vehicle
  • Generally you see this situation on a vehicle that has LED lights because there is a power bleed coming from a different circuit into the lighting circuit. LED lights require a lot less power than incandescents, that's one of the biggest benefits of them. So even a very small amount power can be all they need to light up. Your situation is a little different since your trailer's lights should have absolutely no power supplied to them once you disconnect the truck. But since the lights...
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  • Troubleshooting Wishbone Connector That Either Tail Lights or Brake/Turn Signals Work Not Both
  • From the wire coloring it sounds like you have a wishbone connector and not a traditional 5-way trailer connector. On a wishbone harness the running light circuit is split so you will not have a jumper wire run from one side of the trailer to the other. The wire color code will be yellow is left turn signal, yellow/brown is left side running lights, green is right turn signal, green/brown is right side running lights, and white is ground. Does the connector work on the rear of your...
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  • Wiring For Trailer With Brakes For Compatibility With 7-Way Connector On 2016 Dodge 2500
  • Since your 2016 Dodge 2500 has a 7-way, I recommend just adding a 7-way trailer wire connector to your trailer like # H20046. This will give you a simple connection between your vehicle and trailer without converters. You can simply tape up the wires you aren't using at the trailer and leave them in your junction box. If you want a 7 way with junction box, you can use the Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long, # 277-000141. Adding this molded 7-way plug will...
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  • Wiring Adapter for Land Rover to Allow Proper Operation of LED Trailer Lights
  • We do offer wiring adapters for import vehicles to help them properly operate the LED lights on a trailer. If both the vehicle and trailer have a 7-way RV style connector then you can use part # C57003 from Curt. If the trailer has a 4-pole flat connector then instead you'll use # TR20141 which provides that connection. Both of these require a 7-way socket on the vehicle, like the one shown in the linked photo.
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  • Parts Needed to Install Trailer Wiring & Brake Controller in 1968 Chevrolet C/K Series Pickup
  • Most camper trailers with electric drum brakes use a 7-way RV style plug like the one on part # H20046 and so you'll need a mating 7-way socket on the C10. This socket will carry all lighting signals as well as brake power and 12V auxiliary trailer power to your Casita. You will also need a brake controller to send power to your trailer brakes. You will need a 4-pole harness on the truck, which we'll then adapt to the 7-way type using our Brake Controller Install Kit # ETBC7. If you...
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  • Troubleshooting Trailer Wiring that Stops Working When Headlights Are 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.
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  • Wire Gauge Recommended for a 7-Way Trailer Connector
  • The 7-Way trailer connector # PK11893 does not take any wire directly. It is what is called a US car connector. There is a mating harness that plugs into the back of it that will either already be on the vehicle or you would use # PK11998 which uses a mix of 10 to 14 gauge wire. Going with larger gauge wire (10 is usually the largest you will see for trailer wiring harnesses and connectors) can lead to a level of resistance that will cause some functions not to work properly. Unless...
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  • Can Electric Trailer Brakes Ground Through Aluminum Trailer Frame
  • Typically for aluminum frame trailers we recommend running the ground wire of each assembly all the way back to the main ground harness of the trailer up by the coupler as aluminum does not conduct electricity well and doesn't always work well for brake grounds.
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  • How to Wire Two 12 Volt Batteries on a Trailer
  • It sounds like you tried to attach a picture but it didn't come through. However, I think I've got the idea. If I'm correct, what you're trying to do is actually considered the ideal way to connect two trailer batteries. Generally the two batteries are connected in parallel. Meaning the power wire is ran to the positive side of one battery (From the trailer's 7-way connector) and that same battery is grounded to the trailer's frame. Then both the positive and negative are ran from...
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  • How to Connect a Trailer with a 6-way Connector to a Ford F-350 with 7-way Trailer Connector
  • To connect your trailer that has a 6-way trailer connector to your Ford F-350 that has a 7-way connector you will need an adapter, part # 47549.
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  • Wiring Diagram Recommendation for Installing Pollak Metal 7-Pole
  • If you check out the picture I attached you will see a diagram to use for wiring up the 7-Way part # PK12703. The pin in the 1:00 position will be the charge circuit that you mentioned.
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  • Identifying Trailer Wire Colors and Troubleshooting Trailer Wiring Not Functioning
  • I can help you identify the wire functions of the kit you have. The yellow wire is left turn/stop, the green is right turn/stop, the yellow and brown is left side running light circuit and the brown and green is right side running light circuit. You didn't mention a white wire though which is a very important circuit. That is the ground circuit and without it being connected to a clean metal surface on the trailer frame none of the circuits will function.
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  • 4-Way To 7-Way Trailer Connection For Use Without Trailer Brakes
  • For your specific application, you can simply connect the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, # 30717, and mount it with # 18138. Since you don't need brakes, 12 V charging power, or reverse lights on the trailer the other wires can just remain unconnected. You can transport the trailer from point A to point B without those other wires connected. Without connecting the additional wires on the # 30717, you will still have turn, stop, and taillight functions on the...
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  • Does 4-Way Trailer Wiring Harness Have Reverse Light Feature
  • I can certainly help you with that. Since the Curt T-Connector Vehicle Wiring Harness, part # C55384 is a 4-way connector the four functions will be Yellow for the left turn and brake, Green is for right turn and brake, Brown is for running lights, and the White is the ground wire that gets attached to a clean metal surface. For the reverse light function you will need a 5-way trailer connector and you can use the fifth wire to attach to the reverse light circuit on your vehicle....
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  • Troubleshooting Hopkins Impulse Brake Controller
  • The error code E-1 on a Hopkins Impulse brake controller means there is not a trailer connected. If no trailer is connected you will continue to get the E-1 code. If you have a trailer connected and it is still displaying E-1 you likely have a short on the brake output circuit, the blue wire. Start by inspecting the 7-way trailer connectors on both your truck and trailer. Make sure they're clean of debris and corrosion. Check both the pins on the outside of each connector, as well...
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  • Is Plug-In Adapter Available For Brake Controller On 2013 Chevrolet Tahoe
  • There is no plug under the dash for a brake controller so it requires hard-wiring the brake controller. I have attached a link to an installation video for a # 90195 P3 brake controller on a Tahoe you can check out. The installation would be the same for your Tahoe. I recommend using a circuit tester like part # 3808 to verify the wire functions before you attach them for the brake controller.
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  • Does Trailer Wiring 4-Way 48195 Come with Both Connectors
  • Yes, the part # 48195 that you referenced comes with both sides of the trailer connectors like what you see in the product pictures. One side for the trailer and the other for the vehicle.
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  • Tow Ready Replacement 7-Way 118015 Trailer Connector Fit a 2009 Dodge Ram
  • Yes, the 7-Way Socket part # 118015 that you referenced would fit as a replacement for the 7-way you have on your 2009 Dodge Ram. The Delphi brand is a standard brand used for several vehicles as factory equipment.
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  • Trailer Hitch and Wiring for a 2016 Honda Civic Coupe LX
  • The trailer hitch for the 2016 Honda Civic Coupe is Draw-Tite hitch # 24946. It is rated for 2,000 pounds gross trailer weight and 200 pounds tongue weight so it can handle the trailer and bike. The recommended ball mount is # 3593 and you can use 1-7/8 inch ball # 19257 or 2 inch ball # 19258. And for a trailer wiring harness use # 118724. It plugs in line with the vehicle tail light wiring. I have linked instructions for the wiring and hitch for you. When you install an aftermarket...
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  • How Much Slack Is Needed In Trailer Wire Connection To The Tow Vehicle?
  • The length of wire desired depends on your vehicle connection and your personal preference. You want enough slack for turning, but not so much for dragging as you mentioned. A little extra slack isn't a problem and not enough could lead to stress and wire connection problems. In general, you will want between 16 inches and 24 inches of wire beyond the tongue depending on where your connection point is on your tow vehicle.
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  • Trailer Running Lights Not Working and Blowing Fuse on Tow Vehicle
  • There is a short somewhere that is over-drawing the running light circuit causing the fuse to blow. Fixing it isn't a problem but you just have to find it first. Make sure that the vehicle and trailer side connectors are clean and free of corrosion inside, where the wires attach, and outside on the pins. Next, inspect the wiring on the trailer side and fix any damaged or pinched wires. If you still have the same problem then the issue could be that the combined power draw from the...
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  • Running Light Circuit Not Working on Trailer Connectors on a 2012 Ram 3500
  • It sounds like the tow package running light fuse is blown on your 2012 Ram 3500. On the 2012 Ram there is a trailer running light fuse in the fuse panel under the hood in location J14. Since none of the connectors on the truck have power to that circuit and the lights work fine on the trailer when connected to a different vehicle that indicates a fuse as the most likely culprit.
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  • Trailer Wiring Harness to Add Trailer Connector to 2016 Toyota Land Cruiser
  • To add a 4-way trailer connector on your 2016 Toyota Land Cruiser you're going to need to hardwire in part # 119190. This is a universal connector that will power your trailer's lights. If you need additional wire to connect to your vehicle's battery you can use # 118151. I've attached a video of both products being wired onto a BMW that will be the same basic process for you. If you'd like to add a 7-way connector, after you've installed the 4-way you can use part # ETBC7. This...
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  • 2 Foot Long 6-Way Vehicle to 7-Way Trailer Connector Adapter
  • A 6-Way to 7-Way adapter is not all that common but we have a few. but they are not 2 feet long. The closest we have is # 47435 which end to end is around 12 inches but the wiring part between the 6 and 7-Ways is 6-1/2 inches long. What you could do is use # 50-87-002 which is 2 feet long. You would just need to add a trailer side 6-Way, # PK11604.
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  • 4-Way to 7-Way Adapter Recommendation for 2015 Chevy Traverse
  • If your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how...
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  • Can Smaller Gauge Wire Be Used For 7-Way Trailer Connector
  • The wiring gauge recommendations for the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector, item # PK11700, are listed below. White - Ground Return - 8 gauge Black - Clearance, Side Marker, Identification - 12 gauge Yellow - Left Turn and Hazard Signal - 12 gauge Red - Stop Lamps and Anti-Lock Devices - 10 gauge Green - Right Turn and Hazard Signal - 12 gauge Brown - Tail, Rear Clearance, Marker and License-Plate Lamps - 12 gauge Blue - Auxiliary Circuit/ABS - 10...
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  • What Is The Purpose Of 12V Power On Trailer Connector For Fifth Wheel Trailer
  • The 12V power pin on the 7-way connector for your fifth wheel is used for maintaining a charge on the trailer battery or auxilliary power. I have attached a helpful article that explains what each of the wires on a trailer connector functions are you can check out.
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  • Why Would Interior Light Circuit Not Be Active on Enclosed Trailer
  • Check the 12 volt accessory circuit on the 7-way of your truck. This is the pin in the 1:00 position. It carries the 12 volt power circuit used for interior lights and isn't always active on trucks so it is most likely the problem. If needed you may need to run a 10 gauge wire like part # 10-1-1 up to the battery of your truck through a circuit breaker like part # 9510.
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  • Does Wesbar Adapter Coiled 787196 Work with TrailerMate Tow Bar Harness TM781124
  • Yes, the Wesbar Adapter Coiled part # 787196 will fit the TrailerMate Harness for your 2015 Jeep Wrangler part # TM781124.
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  • Standard 7-Way Wiring For Vehicle Side Trailer Connection
  • I don't know which truck or trailer isn't wired standard, but it sounds like with multiple trailers working on your vehicle that your friend's truck and trailer are wired wrong, but to fit each other. I've attached a picture of what each of the 7 pins are set to function when set up with the standard configuration. I've also attached an article on trailer wiring to help. I suggest using a circuit tester like # PK12741 to help you determine if your truck is wired correctly and what function...
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  • Available Sizes of Heat Shrink Tubing
  • Part # DW05451 is a pack of 25 six-inch lengths of heat-shrink tubing. This tubing fits wire from 14-gauge to 18-gauge. Similar item # DW05449 works on wires from 10- to 14-gauge. You can use a heat gun like # ALL836717 to shrink the tubing once your electrical connections are complete.
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  • Utility Trailer Running Light Will Not Work When Plugged Into 2014 Dodge Ram Pickup
  • The first thing I would check is the your trailer to vehicle plug. Check to see if any of the pins in the connector look corroded. If the pins look good, make sure that there is plenty of dielectric grease # LT37534 in the connection. The grease will help ensure a good electrical connection while preventing corrosion and sealing out contaminants that might cause electrical shorts. Next I would check the fuses in the truck. You can use a tester like # ALL640595 to check the fuses to...
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  • Wiring New Trailer Connector with Reverse Light Signal to 2015 Trailstar Tandem Axle Trailer
  • The easiest way to add a reverse light circuit to your TrailStar trailer is to tap into the reverse light circuit on your 5-pole, IF that is the assigned function. Often boat trailers with surge couplers have an electric reverse lockout feature that allows you to back up the trailer without having to first get out of the truck to manually engage a lockout (which prevents the brakes from actuating as you back up against the coupler). If your trailer coupler has an electric lockout feature...
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  • Installing Circuit Protected ModuLite Harness In A 2016 Toyota Prius
  • To access the battery in your 2016 Prius, you will need to remove the seat portion of the passenger side rear seat. This should expose your battery. Next, you will simply remove the passenger side trim in the rear of the vehicle and run the power wire of your Upgraded Circuit Protected ModuLite with 4 Pole Harness and Hardwire Kit, # 119179KIT behind that molding on the passenger side from the rear light to the back seat and make your connection to the battery. Make sure your in-line...
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  • Recommended Replacement Trailer Wiring Harness For 2002 Dodge Ram 1500 With 4-way
  • We have just what you need for a trailer wiring harness replacement. But you may want to first check the trailer wiring fuses or relays. You should have a fuse legend on the inside fo the fuse panel. You should be able to find it in the owner's manual or check with your dealership for the trailer towing fuses or relays. You said you have the Mopar wire harness on your 2002 Ram. If you did not have a 7-way harness I recommend part # C55504. You just need to locate the connection points...
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  • Compatibility of Hopkins 4-Pole to 7-Pole Adapter 37185 with 4-Pole Wiring on 2017 Subaru Outback
  • The Hopkins Adapter # 37185 connects to a 4-pole flat type trailer connector on the vehicle, such as # 118467, and allows the three lighting circuits in the 4-pole to be available in the 7-way RV-style connector format. This item is not vehicle-specific and it will work with the standard 4-pole harness on virtually any vehicle. An installation video is linked. You will simply plug in the 4-pole to the mating connector on the adapter and then secure the white ground wire to a clean bare...
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  • Troubleshooting Trailer Wiring After Installing Lights And Wiring
  • There could be a couple of reasons why the lights are not working now. You said you replaced some lights and wiring. I recommend checking all of the connections to make sure everything is secure and wired properly. You can use a circuit tester like part # 3808 to make sure all of the lights and wires are receiving current as designed. If everything checks out the problem is probably the ground connections. Check the inside of the trailer connector for corrosion. If you find any green...
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  • What Wire Gauge Is Used With Hopkins Endurance 4-Way Flat Trailer Wiring Harness
  • The wires included with the Hopkins Endurance 4-Way Flat Trailer Wiring Harness, part # HM48265 are all 18-gauge. Most 4-way wiring harnesses will be a 16 or 18 gauge wire. The lower the number, the bigger the wire, so the 18 is bigger than the 20-gauge you asked about.
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  • Troubleshooting Brake Mode on Jeep Grand Cherokee When in Reverse
  • Fixing this will depend on the type of brakes your trailer has, electric or hydraulic. If you have hydraulic, or surge brakes along with an electric reverse lock out the problem is likely that the center pin on your 7-way at the rear of your Jeep does not have a reverse light circuit connected. If your trailer's brakes are electric then the brake circuit wire coming from your trailer's 7-way is either not wired to the correct pin or has a short.Check the connector and make sure it's...
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  • No 12-Volt Power for Trailer Connector Battery Power on 2004 Chevrolet Silverado
  • If you are not getting 12-volt power for the battery charge line coming out of your vehicle's 7-Way wiring connector, you might need to check the fuse and wiring located under the hood. If the fuse is installed, it would be located in slot 68 of your fuse box. A 40 Amp fuse is required for the battery power. I recommend using # ALL640595 to check the wire connections for power. Check first if a fuse is installed. The fuse that Chevorlet states should be used in this slot is a 40 Amp...
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  • Can a Non-Powered Trailer Wiring Harness be Used on a 2014 Ford Escape
  • I wouldn't say you are completely wrong. The reason that some vehicles require (or it is recommended) a powered trailer wiring harness is because modern vehicle wiring has become so then that it often times cannot handle the additional power draw from trailer lights. In other circumstances if the vehicle computer sense more draw than what its own lights draw it can cause error messages and might not allow the trailer lights to work. A powered trailer wiring harness supplies the power...
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  • Why Would Trailer Brakes Lock Up without Brake Controller When Vehicle Brakes are Touched
  • When this happens it means the stoplight circuit is shorting out to the brake output circuit. I bet if you turned on your blinkers one side would cause the brakes to intermittently lock up too. What you need to do is go over the wiring of the trailer and vehicle (starting with the connectors) and look for any obvious signs of a short and fix as needed.
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  • Recommended Trailer Hitch Receiver For 2016 Kia Sorento
  • For your 2016 Kia Sorento, I recommend the Curt Class III hitch # C13195, over the Draw-Tite Hitch # 75908. I recommend the Curt hitch receiver because the tongue weight is so much stronger at 750 pounds versus the 500 lb rating of the Draw-Tite. The reason I think people may lean toward the Draw-Tite for your vehicle is the installation is slightly easier saving between 10 and 20 minutes. Some people also don't like that Curt recommends that you use a stabilization strap, # 18050,...
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  • Universal 7-Way Trailer Connector to Use on a Custom Trailer
  • The Bargman 7-Pole, RV-Style Connector # 50-67-008 is a 22 foot long 7-way connector for use on a trailer. It's a universal product that can be used to replace an existing 7-way or added to a newly built trailer. We offer similar products in different lengths. See the attached link for our selection. If you're looking for just the connector without the lead, part # 54-77-003 is what you'll need instead. I've also attached a help article on trailer wiring you might find useful.
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  • Fuses on RV and Toad Blow After Installing InvisiBrake and Connecting to RV
  • I believe the issue is in how you have the InvisiBrake # RM-8700 wired up. It has a very specific wiring set up that needs to be followed. I have included a picture of what that should be. It sounds like you have a trickle charge coming from both the running light circuit and the 12 volt circuit, whether intentional or not, and that is overloading the system. You would only need one of those charge lines to the vehicle battery. If you re-adjust how the unit is wired to match the diagram...
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  • Only Running Lights and Turn Signals Work on Flat Bed Added to a 2006 Chevy Silverado
  • Does the flat bed use combined brake lights/turn signals or does it have separate amber turn signals? The 2006 Chevy trucks used a separate system with brake and turn signals on separate wires. If the flat bed has them combined then that would be the issue. You would have to take the separate signals from the truck combine them and then it would work. To do that you would need a converter, # RM-732. On this converter the white wire grounds to the frame the red wire is for brake lights,...
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  • Recommended Adapter For 2011 BMW X5 Towing Trailer With LED Lights
  • The 7-Way to 5-Way and 4-Way Trailer Adapter, part # TR20141 would be the adapter that will work on your 2011 X5. The description says Audi, Porsche, and Volkswagen but it is designed for vehicles with a factory tow package that have the lamp-out sensors. The diodes inside the adapter keep the vehicle from thinking there is a problem with your taillights.
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  • Trailer Marker Lights are Not Working But All Other Lights Work
  • To determine where the problem is first disconnect the trailer from the tow vehicle. Use a circuit tester such as # 3808 or a meter if you have one to test the vehicle side trailer connector while the head lights are on. If there is power on the pin in the 11 o'clock position then the issue is on the trailer. If there is no power during this test the issue is on the tow vehicle. Besides fuses some vehicle tow package wiring also use relays. The various fuse panel lids under the hood, and...
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  • Trailer Wiring Harness Recommendation for 2004 Lexus ES 330
  • The only trailer wiring harnesses we can safely recommend for your 2004 Lexus ES330 are the universal ones like the part # 119179KIT. Harnesses for a Camry are not confirmed as fits and we can't verify if they would work. If you wanted a no-splice option that would work we have the ZCI kit part # 119250KIT.
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  • Availability of Battery Terminal Brush Set for Positive and Negative Side of Battery
  • We don't have different sizes since top terminals on batteries are all the same size. But we do carry the part # DW05515 which has 5 brushes. This way you would be able to have one for either terminal with a few spares.
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  • Are RV 7-Way to 4-Pole Wiring Adaptors Vehicle-Specific
  • Trailer wiring adapters like Hopkins # HM47065, Pollak # PK12716 and Hopkins # HM47365 are not vehicle-specific products. They will work on any vehicle that has the appropriate connector. The coiled wire adapter # HM47065 that you referenced combines a trailer-side (male) 7-way RV-style plug (that mates with the 7-way socket on your Ram 3500) with a vehicle-side 4-pole flat type plug. This wiring adapter carries only lighting signals (stop, turn and tail) but not other functions like...
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  • 7-Way Recommendation for Installing on Older Horse Trailer
  • I have a great solution for you, but the part # 50-87-009 is the vehicle side trailer connector. It is a 7-way like you need though so you are on the right track. For your trailer you would want the part # H20036 which would go well with the part # 50-87-009 if you installed it on your tow vehicle. I attached a help article that has trailer wiring diagrams as well.
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  • Can 7-Way part # PK11720 Wire to 7-Way Harness Part # C56307
  • Yes, the # C56307 could wire to the 7-way connector part # PK11720 that you also referenced.
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  • Solution for Towing Rockwood Trailer with 4-Way Flat Connector
  • The connector of the # 30104 would be the same but the pin out is Jayco specific and would not match your trailer. Your best option is to cut off that connector on your trailer and install a 4-way flat like part # HM48205 so that your trailer can be towed by your tow vehicle and so that you can tow it with other vehicles easily as well.
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  • Trailer Wiring Connectors that Carry Reverse Light Circuit
  • The most common trailer connector that carries the reverse light circuit is the 7-way. This is a very common connector style. Also the flat 5-way carries this signal as well. This is most common seen on boat trailers or others with surge brakes. For a 6 foot long harness with a 7-way we have the part # H20044. Or for a 5-way we have the part # HM47910. I also attached a help article on trailer wiring for you to check out too.
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  • Troubleshooting No Trailer Running Lights and No Power at 7-way on Rear of 2008 Chevrolet Silverado
  • It sounds to me like the fuse for your trailer's running lights has blown. The 11:00 pin when looking into your 7-way is for the trailer's running lights. The 1:00 position is for 12 volt power. I found an online copy of an owner's manual for a 2008 Chevrolet Silverado and it shows the correct fuse in location 25. You might verify with your manual but I'd start there. If you find a blown fuse the next step is to determine why it blew. Make sure the 7-way on both your truck and...
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  • Trailer Breakaway System Battery Requirements for 5th Wheel
  • A trailer breakaway system must have a dedicated battery on the trailer. If it did not have its own battery the breakaway system would not operate if the trailer connector disconnected from the vehicle. A dedicated breakaway battery is required so that an uncoupled trailer's brakes will activate to bring it to a stop, but a second backup battery on the trailer is not required. I linked our main page for trailer breakaway kits. We offer basic kits like # C52026, kits with a built-in battery...
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  • Installing 7-Way Trailer Connector On 2002 Chevrolet Avalanche With 4-way Connector
  • To install a 7-way trailer connector on your Avalanche that has a 4-way connector you will need part # 30955. This simply plugs into the connector that is located above the spare tire. With this you will have a 4-way and a 7-way connector on your Avalanche. I have attached a photo that shows where the connector is. If you need a brake cotnroller I recommend part # 90195. The brake controller can be easily installed using a plug-in harness like part # 3025-P. If you do not have...
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  • 7-Way and Junction Box Recommendation for Wiring Trailer for New Lights
  • For all the functions you are looking for you would want to install a 7-way and then use a junction box to organize the wiring. Starting with a trailer side 7-Way connector you can use # H20042 which is 3 feet long. It doesn't have to be long though because it is going to the junction box. Speaking of junction boxes you can use # 38656. I have included a picture showing how it can be wired up and a video showing installation to the right. For the rest of the wiring you can use ...
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  • Troubleshooting Trailer Wiring on 1999 Chrysler Cirrus Where all 4-Way Pins Have Voltage
  • If all of the wires have voltage when the signal lights come on typically that is a sign of a shorted out converter box of the wiring part # HM48925. You can test this by checking for voltage on all of the wires leading into the box to see if the correct voltage is on the wires when the appropriate turn signal is applied and then check the output side of the box. Is correct on the input side then the box is shorted out. If not then it is wired wrong. Before you replace the harness...
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  • Trailer 7-Way Connector and Wiring to Rewire a Trailer with Electric Brakes
  • We have the Hopkins 7-Way Molded Trailer Wire Connector # H20043 which is 4 feet long. If it were me, I would use this with a junction box, like # 38656. For the wire you will want 10 gauge for the brakes, part # 10-1-1, and 12 gauge wire, part # 12-1-1, for lights. Both are sold by the foot. You will also need ring terminals # 44-5310A and butt connectors # DW05745-10. I've also attached a help article on trailer wiring that includes a wiring diagram you might find helpful.
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  • Extra Long Coiled RV Style 7-way Connector
  • We do have longer connectors, like the WesBarg 7-Way, RV-Style Connector # WG54006-046 which is 12 feet long. We also have connectors that aren't coiled like the Bargman 7-Pole, RV-Style Connector - Trailer End # 50-67-008 which is 22 feet long.
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  • 7-Way Recommendation for 2005 BMW X3
  • If you do not have a 4-way connector already you would need to start with one. For that you would need the part # 119190KIT. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. Either 7-way adapter comes with a...
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  • Recommended Trailer Wiring Harness For 2017 Honda Accord Coupe
  • The trailer wiring harness you asked about, part # 118684, is designed to fit the Honda Sedan only and is not a fit for your Coupe. I do have a harness that will work for you. I recommend the Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector, part # 119147KIT. The installation of this kit does require hard-wiring. The kit comes with a circuit tester that helps identify the wires located behind the vehicle tail lights. This harness works with incandescent or LED...
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  • Where to Connect Trailer Running & Side Marker Lights to Epicord 7-Way Junction Box 277-000141
  • On the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 the post that should be used to connect running lights and marker lights is the green one that has the green wire attached. Here is the complete wire/function/wire gauge configuration for this item: White (ground): 10 gauge Black (12V power): 10 gauge Yellow (reverse/auxiliary): 14 gauge Red (left turn and stop): 14 gauge Green (tail and running lights): 14 gauge Brown (right turn and stop): 14 gauge Blue...
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  • Can LED Clearance Lights Be Used with Incandescent Bulbs on Trailer
  • Yes, you can use LED marker lights on the side of a trailer that is otherwise using incandescent lights. I attached a link to a page that has all the LED clearance lights we offer as well.
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  • 7-Way to 4-Way Adapter Recommendation for 2012 BMW X5 Towing Trailer with LED Lights
  • Yes, the adapter part # TR20141 is exactly what you would need. This will plug into the 7-way of your BMW and will allow you to tow a trailer with LED lights without error messages.
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  • 7-Way to 4-Way Adapter Recommendation for Connecting from RV to Towed Vehicle
  • The Hopkins Nite-Glow 7-way to 4-way flat coiled adapter, part # 47015 will work with the 7-way on your RV and then would plug into the 4-way. It would plug right into the connector at the front of the towed vehicle.
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  • What is Yellow Post of Epicord Junction Box and 12 Volt Accessory Circuit Used For
  • The yellow pin of the part # 277-000141 that you referenced is normally used for the reverse light circuit. This is typically used for reverse lights on the trailer or for a reverse lockout solenoid for if the trailer has surge brakes. The 12 volt accessory circuit (black) can be used for a variety of things. Most common is a breakaway battery charge circuit or interior/exterior lighting. I attached a review video for you to check out as well.
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  • Trailer Lights Left Side Turn Signal and Brake Lights Not Working
  • Your brake lights and turn signals for each side are on one circuit. The left side turn signal and brake light is generally the yellow wire going into your trailer connector. The first thing to do is check the fuses on your tow vehicle. Next, inspect and test the connector at the rear of your tow vehicle with a circuit tester like # 3808. If the problem is there then you need to clean it, if necessary, and if that doesn't fix it the problem is in your vehicle. If everything checks...
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  • Compatibility of Hopkins 4-Pole to 7-Pole Adapter 37185 with Wiring on 2005 Ford F-150
  • The Hopkins 4-Pole to 7-Pole Adapter # 37185 and the similar Tow Ready part # 30717 are not vehicle specific products. Either can be installed on any vehicle that has a 4-pole already in place. Between the two I recommend the Hopkins since it allows you to have both connector types in place at one time and it includes a mounting bracket. The Tow Ready gives you only the 7-way and no bracket. Please refer to the linked photo that shows you how to connect the four pigtail leads for...
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  • 5-Pole Flat Trailer Wiring Harness for 2016 Dodge Ram 1500
  • We do offer wiring adapters that allow a vehicle with one type of trailer connector to tow a trailer with a different connector. All such adapters like # A75TB, which converts a 7-way RV style connector to a 5-pole flat, are shown on the linked page. These are fine for the short-term but since adapters mean more connections - and more connections can mean more problems - I suggest instead a 5-pole wiring kit that plugs right in to the U.S. Car connector at the rear of the Ram. You can...
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  • 4-Way to 7-Way Adapter Recommendation for 2011 Toyota Highlander
  • Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and...
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  • Can a Breakaway Battery and Deep Cycle Battery be Charged off of the Same 12 Volt Line
  • What you could do is use the center pin on a 7-Way and instead of having the reverse light circuit on that pin you could remove the wire that is there and run a 10 gauge wire, such as # 10-1-1 sold by the foot, from it up to the truck battery via a 40 amp circuit breaker # PK54540. Then run wire from the center pin on the trailer side to the deep cycle battery to maintain it. This way the batteries each have their own 12 volt source and there is no chance of back feeding. Another option...
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  • 5-Way Recommendation for Trailer for Installing Reverse Lights
  • What's great about 4-way flats and 5-way flats is that they can fit each other without the need for an adapter. So what would be your best option is to use the part # HM47570 in the 7-way of your truck and then add a 5-way part # W002290 to your trailer. Basically you would want to cut off the 4-way wires short and then leave the 5th reverse light wire long to run it back to the reverse lights. The remaining wires would wire directly to the 4-way wires the trailer currently has.
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  • Parts Needed to Add a 7-Way Trailer Connector to a 1992 Chevy C/K Series Pickup Truck
  • To add a 7-Way trailer connector to your 1992 Chevy K-Series pickup all you will need is # ETBC7. This kit comes with the parts needed to add a 7-Way, it also retains the 4-Way, and also includes wiring to install a brake controller. For a brake controller I recommend the P2 # 90885 because it is easy to set up and use and it is reliable. I have included some links that show and explain the ETBC7 installation.
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  • Indicator Light On Curt 4-Pole To 7-Pole And 4-Pole Always Shows Power Draw
  • Since you said you installed the black power wire to the positive battery post, the indicator light will always be hot, even with the 40-amp circuit breaker installed. If you want to keep the trailer from draining the battery you can install the Tow Ready Battery Isolation Solenoid, part # TR118665, inline on the power wire. This will prevent your vehicle battery from draining when a trailer is connected. You just install the # TR118665 between the circuit breaker and the battery...
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  • Ring Terminal Sizes Needed for Installing Epicord 7-Way Plug with Junction Box 277-000141
  • The terminal posts in the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 are indeed a 3/16-inch diameter. You can use ring terminal # 44-5310A for connecting 10- and 12-gauge wires. For the lighter 14-gauge wiring use part # DW05702-1. You'll need a crimping tool like the one included in our Deluxe Trailer Wiring Kit # HM51020. I also recommend using dielectric grease # 11755 on those connections to protect them from moisture and corrosion.
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  • Trailer Turn Signals Work but Brake Lights and Running Lights are Not Working
  • On a trailer the brake lights and turn signals are on the same circuits so when the turn signals work but not the brake lights it is a little strange. There are some common things that can cause that though. First it is possible that there is a trailer brake light fuse on the tow vehicle that is blown or missing. It could also be a stop light or CHMSL fuse. You can test the vehicle side connector without the trailer connected using a circuit tester such as # 3808 or a meter if you have...
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  • Location of Tow Package 12 Volt Circuit on a 2006 GMC Sierra 2500HD to Install Battery Isolator
  • Yes you are correct. On your 2006 GMC Sierra 2500HD there is a stud for the 12 volt circuit located at the front left corner of the power distribution box (if standing at the front of the truck looking at the motor). I have included a picture that shows it (as a red wire, the actual wire is likely black) and the fuse associated with it. I have also linked a help article, part of which will help with the 12 volt circuit.
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  • Which Fuse Number Carries Trailer Running Light Circuit on 2014 Chevy Silverado
  • From the research I did on your vehicle it looks like the position 15 of the mini fuse section has the trailer running light circuit.
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  • Best Way To Check Brake Light Signal For An Electric Brake Controller On A 1997 Ford Explorer
  • When checking the wires associated with a brake controller, you should use a incandescent circuit tester like the Quickee Circuit Tester # 3808. This will actually cause a power draw on the wire to light the bulb and give you an accurate visual of if the system is functioning correctly. You will need a 12V power for the brake controller to work. I can confirm you are testing the correct wires and that the green wire will connect to the red wire on your brake controller. If the incandescent...
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  • What to Use to Test 7-Way Trailer Connector
  • To test a 7-way trailer connector on the rear of your vehicle you can use the Pollak Tester # PK12741. This tester is designed to work with all 7-way connectors. Another option is to use a circuit tester like # 3808 and go come pin to pin testing each individually. If you're trying to test the trailer side connector it's a little different. A disconnected trailer doesn't have a power source so you will need something to provide it. The Hopkins Tow Doctor # HM50928 and Tekonsha Circuit...
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  • Will 7-Way Trailer Connector on Trailer Side Wiring Diagram Match a 2015 F-250 Factory 7-Way?
  • The wiring diagram for the Optronics 7-Way Round RV Style Trailer Connector - Trailer Side, when installed correctly will match a factory 7-way system or an aftermarket 7-way vehicle side connector on your 2015 Ford F-250. I have attached a trailer wiring diagram help article to assist.
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  • 7-Way Tester for Testing Trailer Side 7-Way
  • We have the Tekonsha 7-way tester part # 8010 that can test a trailer's wiring as well as Hopkins Tow Doctor Trailer End Test Unit # HM50928. Due to the nature of testing the trailer side of the wiring these kits cost a bit more than the testers for the vehicle.
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  • Dimensions of 6-Way PK11609
  • On the 6-way part # PK11609 the section behind the mounting flange where the wires attach is 1-3/8 inches in diameter. The distance between the mounting holes is 2-7/8 inches, overall width of the front is 3-1/4 inches and overall height is 2-1/8 inches.
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  • Why Would Trailer Brakes Feel Weaker Over Time
  • Failing to plug in your 5-way so that the reverse lockout solenoid would kick in would not be why your brakes are weaker now. Most likely you just need to adjust the brakes a bit tighter. Drum brakes require periodic adjustment so that they maintain the appropriate amount of braking power. There is a star wheel at the bottom of the assemblies that needs to be adjusted so that a slight drag is felt on the wheel when turning by hand. Check out the review video I attached for more info...
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  • Recommended Parts To Adapt 7-Way Vehicle Connector To 6-Way Trailer Connector.
  • Let's start with the vehicle side. If you don't already have trailer connector on your 2008 Toyota Tacoma, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118496. Once you have the 4-way, you can install either a 6-way or a 7-way. Factory tow packages come with a 7-way, but you can install a 6-way and be set for your camper. The Brake Controller 6 and 4 Way Installation Kit, 10 Gauge, # ETBC6 will give you everything you need to convert your 4-way...
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  • How to Go From 4-Way on Vehicle to 7-Way Round on Trailer
  • It won't be pretty but you would need two adapters. You would need the part # 30717 to convert the 4-way to a 7-way blade and then the part # 47595 to convert the 7-way blade to 7-way round.
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  • How to Test to Determine Correct Wiring for 7-Way Vehicle Socket
  • There are three common ways a 7-way trailer connector can be wired; these depend on the type of application. For the most common, the RV standard, the function carried on each of the pins is shown in the photo I linked for you. This wiring scheme and the two others are all shown in the linked article on trailer wiring. Since you have had a fuse blow it does sound like one or more of the circuits on your truck has been overloaded by the power draw from the trailer lights. Keep in mind...
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  • Recommended Replacement Part for Pollak 12-705 Trailer Wiring Socket Vehicle End
  • Yes, the Pollak Black Plastic 7-Pole RV Blade-Style Trailer Socket - Vehicle End, # PK12-707E, will work to replace the Pollak wiring socket that is broken. The insert will allow you to simply disconnect the wires and reconnect them inside the outer socket. I've attached a review video of this product for you so you can see the simple installation of this replacement part.
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  • Troubleshooting Trailer Brakes that Lock Up When Connected to Junction Box
  • Sounds like you are wiring the brake output circuit from your brake assemblies to a pin on the junction box that carries the 12 volt circuit and not the brake output circuit. You need to make sure that you have the right circuit for the brakes on the junction box.
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  • Battery Isolation Solenoid Recommendation
  • For an isolation solenoid we have the Tow Ready solenoid part # TR118665. You didn't mention what circuit you needed it for but this installs inline on a circuit and then you run to the center pin a circuit that only becomes active when the key is on. In this configuration the circuit would only be active when the key is on.
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  • When Does Blue and Black Wire of 7-Way Circuit have Power
  • The black wire of a 7-way is typically the 12 volt power accessory circuit. This would be hot all the time but on some vehicles it may only come on when the key is in the on position. The blue wire would only see power if a brake controller was putting power on the circuit.
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  • Converting a Semi 7-Way Trailer Connector to an RV 7-Way Trailer Connector
  • There are a number of factors involved when converting a semi 7-way to an RV 7-way. Semis generally use a 7-pin round pin socket, similar to # PK11720. And RV style 7-way uses blades, like # PK12706. We do not offer any pre-made adapters to make this conversion that will carry all of the electrical functions required by the RV. Another thing to be aware of is fifth wheel trailers use a combined wiring system where the brake lights and turn signals are on circuit. Your semi connector...
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  • Wire Gauge of Wesbar 4-Pole Flat Connector With Jacketed Cable
  • I verified with Wesbar that the 4-Pole Flat Connectors # W787274 for the 14 foot, # W787270 for the 10 foot, and # W787268 for the 8 foot are all 14 gauge wires.
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  • Testing Functions on 7-Way Trailer Socket on 2014 Dodge Ram Pickup
  • If your 2014 Dodge Ram Pickup has a factory-installed 7-way trailer connector then the reverse light circuit should be connected. The common configuration for RV-style 7-way sockets is for the center pin to carry the reverse light signal. Please refer to the linked photo that shows the function carried on each pin. If you have a circuit tester like # 3808 or # 40376 you can test the truck connector to see if a reverse light signal is present. Have a competent helper start the truck and...
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