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Expert Answers about Wiring


  • What Wire Gauge Needed for 12V Trailer Power Feed
  • A 12V trailer power circuit will typically be wired with 12-gauge wire, part # 12-1-1, but certainly there is no harm in using heavier 10-gauge wire # 10-1-1. If one tow vehicle is longer than another, our installers may opt to use the heavier gauge wiring than they would for a physically shorter vehicle. When in doubt you can always use 10-gauge.
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  • Troubleshooting a Factory Brake Controller in a 2007 Ford F250 that Shows No Trailer Connection
  • Most likely your problem is corrosion on the brake output circuit of the 7-way. I would inspect the 7-way on both your trailer and 2007 Ford F250 and clean the pins as necessary. I also attached an FAQ article on troubleshooting brake controller installs for you to check out as well. You also can replace your factory brake controller if you like also. For more info on that check out the FAQ article I attached to the right. For a brake controller I would recommend the Prodigy P2 Brake...
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  • 7-Way Adapter Recommendation for a 2004 Ford Expedition Towing Surge Brake Trailer with Lockout
  • All you need is the 4-way to 7-way adapter part # 37185. Now to activate your reverse light solenoid you have on your trailer with surge brakes all you will need to do is connect the purple wire of this harness to the reverse light circuit of your 2004 Ford Expedition. To find the right wire you will want to use a circuit tester like part # 3808 to test the wires of the reverse light harness. Once you find the circuit that has current when the reverse lights get turned on you will attach...
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  • Troubleshooting Running Lights on 2010 Palomino Sabre 5th Wheel Trailer
  • There are several potential causes for the lighting malfunction on your trailer, ranging from bad bulbs in the specific fixtures to damaged wiring within the trailer frame to a weak ground wire connection. You can do some simple tests to determine where the issue may be. If you have a spare 12V battery you can try applying power directly from the battery to the problem lights' contacts. If they work when powered directly then you know the issue is somewhere upstream within the trailer...
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  • Can New 12 and 14 Gauge Wire be Used with Existing 10 and 12 Gauge Wiring on Gooseneck Trailer
  • The slight difference in wire gauge between the new part and the existing wiring will be fine. There isn't enough voltage or amperage, to cause any problems. It would be a different story if we were talking about more voltage and/or amperage. But in this case, no worries with the slightly smaller gauge wire.
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  • Will Curt Wiring Harness # C56175 Fit 1997 Mazda Miata
  • The Curt wiring harness # C56175 that you referenced is a fit for the 1997 Mazda Miata so long as your Miata does not have LED tail lights. Given the model year of the vehicle it likely uses standard incandescent bulbs which are compatible with this trailer wiring harness. This kit includes zip ties and quick-splice connectors. Wiring is best done with a tester like # 40376 to enable you to confirm the function carried by each wire on the Miata. Wire colors cannot be relied upon for...
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  • 4-way to 7-way Adapter Recommendation for a 2001 BMW X5 Towing Boat Trailer with Surge Brakes
  • I believe you are referencing # 37185, is also known as the part number 47185B. This would work to convert the 4-way of the Trailer Wiring harness part # 119190KIT to a 7-way. To activate the reverse light circuit of the 7-way so that it will activate the reverse lock out of the surge actuator on your trailer you would need to run the purple wire of the # 37185 to the reverse light circuit of your 2001 BMW X5.
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  • Left Turn Signal on Trailer Will Not Blink but All Other Lights Work
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
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  • Installation Instructions For Hopkins 4-Pole To 7-Pole And 4-Pole Adapter On 2002 Ford F-150
  • I have attached a couple of helpful articles that explains how to attach your Hopkins Adapter 4 Pole to 7 Pole and 4 Pole, part # 37185. I have also attached a drawing that shows where the wires need to be run from the adapter you can check out. As the attached video shows, you may have a harness on the driver side up along the frame rail you can splice the blue wire and the black wire into the wires on the vehicle. For additional blue wire if needed, I recommend part # 10-1-1,...
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  • LED Lights on Trailer will not Work When Towed with 2008 Mercedes-Benz ML320CDi
  • An adapter like the 7-Way to 7-Way LED Trailer Light Adapter, # C57003, contains load resistors which simulate increased power draw so the vehicle thinks there are incandescent lights on the trailer. Just plug this adapter into the back of your Mercedes, plug the trailer into the new 7-way, and you should be good to go. Your vehicle should now recognize the trailer.
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  • Can a Modulite Trailer Wiring Harness be Installed Under the Hood of a Vehicle
  • Technically, you could install the Heavy Duty Modulite # 119190 anywhere that it will fit, including under the hood. But since it is meant to wire into the vehicle tail light wiring for trailer lights the easiest place to install it would be the rear of the vehicle. Otherwise you are running all of the tail light wires and 4-Way to the back of the vehicle which would require a lot of extra wire.
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  • Troubleshooting Non-Functioning 7-Way on Motorhome
  • Since your wiring was accidentally pulled out of the motor home socket, and since you have already checked your fuses and relays, it could be that the socket itself or its connector was damaged. We do offer a replacement 7-way for the F-450 SD and that is part # 20119 from TowReady. This OEM replacement harness installs using a round U.S. Car connector and provides both 4-pole and 7-way connection points.
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  • RV Power Adapter to Mate 30-Amp RV to 15-Amp Household and Generator Power
  • If you need an adapter with a 30-amp female socket on one end and a 15-amp male plug on the other end you can use Arcon part # AR14245. This adapter is 9-inches in length and features durable black PVC connectors and solid brass internal contacts. Please refer to the video link at right.
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  • Trailer Wiring 7-Way Tester Recommendation
  • Actually we do, it's a bit pricey but you would want the Tekonsha Trailer Wiring Circuit Tester # 8010. This plugs into a wall outlet and allows your trailer 7-way to plug into it and it will tell you what circuits are working and which aren't
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  • Trailer Brakes Do Not Work When Using 7-Way to 6-Way Adapter with a 2010 Chevy Silverado
  • The problem that you are experiencing is likely happening because there are 2 different ways to wire a 6-Way trailer connector. The brake output pin will wither be the center pin or it will be in the 2 oclock position, if looking at the face of the trailer side connector. Which ever one that it is, the other one would be the 12 volt circuit. Normally when this happens the trailer brakes will immediately lock up. But it is possible because you have a Chevy truck that the 12 volt circuit...
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  • Screws to Use with the Wire Loom Clamp part # A0500
  • You would want to use some self-tapping screws like the part # FA1131822. These would not require you drill a pilot hole. Just line the screw up where you want it through the Loom part # A0500 and let the drill bit end of the screw drill the needed hole and the threads will pull it through and secure it.
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  • Troubleshooting Camper Trailer Taillights Not Working
  • First let's figure out if the problem is on the trailer or the tow vehicle side of the wiring. You will need to use a circuit tester like our part # 3808 to test the functions of the trailer wiring harness on your 2009 Ford F250. Check out the video I attached to the right to see how this is done. While your testing the running light pin on your tow vehicle make sure the connector is clean and free of corrosion. Do the same for the trailer's connector. If the problem is on the tow vehicle...
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  • How to Test the Functions of Trailer Tail Light Circuits
  • The easiest way to test the functions of the taillight wiring on a trailer is to use a jumper wire. You will touch one end of the jumper wire to the positive post of a 12 volt vehicle battery and then touch the other end of the wire to all of the different wires to see what circuits illuminate. The other option would be to trace the wires back to see where they terminate.
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  • Troubleshooting Trailer Lights After Installing Hopkins Adapter 4 Pole to 7 Pole and 4 Pole # 37185
  • You will want to test the Escape's 4-pole wiring, that connects to the Hopkins Adapter # 37185, to determine if the vehicle is properly sending the lighting signals to the adapter. Use a circuit tester like # 40376 on each of the wires on the vehicle's 4-pole harness. Ground your tester to the exposed pin for the white ground wire. The yellow wire should carry left turn and stop light signals; the green wire should carry right turn and stop light signals; the brown wire should carry a running...
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  • How to Make a 4-way to 5-way Adapter for Towing a Motorcycle Trailer
  • While there isn't an adapter available I can tell you how to make one. You will need a wiring converter like the part # RM-732, a 4-way to plug into your Ranger wiring like part # HM48110 and a 5-way to the trailer like part # HM47900. On the input side of the converter you will need to match the yellow and green colors from the # HM48110. On the output side of the converter the yellow and green wires will match up to the yellow and green of the # HM47900, the red wire from the converter...
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  • Wiring a 4-Way Wired Trailer to a Round 7-Way Connector
  • When wiring up a connector it is important to wire up everything by function and not color. Wire colors can vary from manufacturers so it is better to verify the function of each wire before installing it. Running both running light wires to the running light circuit will be fine. The main ground wire you ran from the connector to the frame will work to ground all of the circuits. One way you can test the functionality of the circuits is to use a jumper wire from a vehicle battery...
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  • Troubleshooting Faint Taillight Functions on a Horse Trailer
  • A couple of things could be what's going on. First thing I would do is inspect both trailer connectors on your truck and trailer. Clean off the connection points as it sounds like you have some corrosion that is preventing the connection from being made. The next place to look is the grounds of the trailer. Each light assembly should be grounded to a clean metal surface. A lot of assemblies ground through the mounting hardware so make sure they are attached to a clean metal surface....
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  • 4-Way to 7-Way Adapter Recommendation for Flat Towing
  • Yes, you will want to install the Adapter part # 30717 on your RV. You will plug the 4-way of your RV into the 4-way of this adapter and then the 7-way of your towed vehicle will plug right into the 7-way of the adapter.
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  • Trailer Wiring Harness Recommendation for a 1994 Jeep Grand Cherokee
  • It sounds like the converter box of the # 56146 has shorted out. If it's putting 12 volts on all three taillight circuits just because the battery wire is hooked up it has shorted out. For a replacement harness I would go with the part # C55349 as it will install inline with your taillights for an easier install.
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  • Trailer Lights Go Out when Vehicle Brake Pedal Is Applied and Both Turn Signals Blink
  • This sounds like a ground problem. The first thing you should know is that testing the trailer with another vehicle is not a fool-proof way of determining wiring issues on the trailer. The other vehicle may have a wiring system that can overcome the ground problems that the intended vehicle cannot. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure...
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  • Using a 7-Way to 5-Flat Trailer Adapter # HM47675 for Trailer with Electric Brakes
  • The 5th wire on a 5-pole flat trailer connector like the Wesbar harness # W002290 can be used for either a reverse lockout function (as on a surge brake coupler) or to deliver a signal for electric brakes. It just depends on how your trailer is wired. 7- to 5-pole adapters like the Hopkins # HM47675 will typically take the 7-way's center pin function and assign that to the 5th pole on the 5-pole output. For an RV-style 7-way this center pin usually carries the reverse light signal, not...
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  • Troubleshooting an Electric Trailer Jack that Doesn't Function on a 2005 Chevy Silverado
  • First thing you will want to do is use a circuit tester like our part # 3808 to test the 12-volt accessory pin on the 7-way of your 2005 Chevy Z71. You should see 12-volts there. This pin will be the 1:00 position of the connector. If there is no voltage there then you will need to check under the hood of your truck to make sure all of the necessary tow package connections are being made on the fuse panel of your truck. This is most likely the problem as one of the connections that gets...
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  • Troubleshooting Trailer Lights that Stop Functioning When Running Lights Come On
  • Sounds like your trailer lights have weak grounds. The behavior you described is textbook insufficient grounding. What you will want to do is check the grounds for the trailer taillights, make sure they are attached to a clean metal surface. Also, make sure the main ground from the trailer's wiring connector is attached to a clean metal surface on your trailer frame. I attached an FAQ article on diagnosing 4-way installs for you to check out plus an FAQ article on trailer wiring.
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  • Trailer Lights Do Not Work when Connected to Truck But Work with AC to DC Converter
  • First, when lights work intermittently that is an indication of a ground problem. It could also be a loose connection somewhere or a dirty/corroded trailer connector. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should...
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  • Trailer Left and Right Side Tail Lights Work Intermittently
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
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  • Troubleshooting No Running Lights on a Trailer Towed by a Ford F250
  • It sounds like the running light circuit of the trailer wiring on your Ford F250 is at fault. I would still verify this by using a circuit tester like our part # 3808 to check the running light pin of the trailer wiring connector. I would then check the fuse boxes on your truck for the trailer wiring circuits and replace the fuses as necessary. There also could be corrosion in your trailer connector that is preventing the circuit from making a solid enough connection to activate your...
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  • Trailer Wiring Harness for 2014 Subaru XV Crosstrek Hybrid
  • Although it has not been specifically tested on the 2014 Subaru XV Crosstrek Hybrid, I recommend going with the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. This is the most universal wiring harness that is available and has been confirmed to work with vehicles using multiplex wiring as well as Pulse Width Modulation (PWM). I spoke with my contact at Curt and verified that the information on our website is correct, the T-Connector...
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  • Can Trailer be Wired for Backup Lights Using 5-Way Plug and then Converted to 7-Way
  • Yes, you could wire your trailer to have backup lights by using a 5-way flat like the Hopkins Endurance Trailer Connector, # HM47910, and then use an adapter like the 7 Pole to 5 Pole Flat Wired Adapter, # A57WB, to be able to plug in to your vehicle's 7-way. Although wiring the 5-way connector for backup lights and then converting to the 7-way will work, this will require more parts than what is necessary. I recommend just wiring in a 7-way connector like the Pollak Black Plastic, 7-Pole,...
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  • Troubleshooting 4-Pole Trailer Connector-Turn Signals and Brake Lights not Working
  • What's the year, make and model of your vehicle? A vehicle can have one of two different taillight set-ups, a combined or a separate system. On a combined system, both the brake lamp and turn signal are carried on one circuit, just like the wiring on most trailers. This is a very simple wiring system, that allows you to simply wire in a connector like the # 18004 connector you mentioned. On a separate system, the turn signal and brake lamp are on separate circuits. Take a look at...
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  • Trailer Wiring Harness Recommendation for 2005 BMW Z4
  • Since a custom wiring harness is not available for your 2005 BMW Z4 2.5i e85, I suggest that you contact your local dealer to determine what type of tail light wiring is on your vehicle. Some vehicles use Pulse Width Modulation, which is a particular wiring system where instead of having a single wire for each different circuit, PWM will use the same wire for two or more circuits by using varying pulses for different functions. Some vehicles also use a multiplex wiring system which means...
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  • Trailer Wiring Harness Recommendation for a 2010 VW Tiguan and Pulse Width Modulation Explained
  • Pulse width modulation is the taillight wiring configuration that is on a lot of modern cars including your 2010 Volkswagen Tiguan. This means that your taillights circuits send varying pulses of power along one wire to operate the different lighting functions of the tail lights. Instead of having a separate wire for each taillight function, (turn signal, brake, taillight), the engineers found a way to carry all of the taillight circuits on one wire. This saves them money because now the...
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  • Difference Between Tow Ready Trailer Wiring Harness # 119179 and # 119179KIT
  • You're correct. Using the 'KIT' suffix after the part number provides the power wire feed to the vehicle battery and the fuse holder, which you won't need (assuming that your existing power feed and fuse holder are in good shape). The # 119179 is exactly what you'd need. However, before installing the replacement, you'll want to closely examine the wiring on the trailer to determine if there was a short in the trailer wiring that caused the converter's demise.
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  • Looking for Adapter to Convert 7-Way on Vehicle to 5-Pole Connector on Trailer
  • I'm assuming you're needing the adapter for a boat trailer that has a surge or hydraulic coupler. The 'brake' wire doesn't carry power to the trailer brakes, it merely 'locks out' the hydraulic coupler when the vehicle transmission is shifted into reverse so the trailer can be backed up without the trailer brakes coming on. If this is the case, I'd recommend the Reese # 78118 adapter, that's compatible with either 4-pole or 5-pole trailer connectors.
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  • Circuits to Use to Wire up a Third Brake Light and Dome Light on a Camper Shell
  • There are a couple of places you can get the correct circuit to use to wire up the third brake light and dome light for your camper shell. You can use the stoplight switch at the brake pedal of your 2012 Dodge Ram 1500. You will need to use a circuit tester like our part # 3808 to probe the wires and find the one with voltage only when the brakes are applied. You can also use the CHMSL circuit on your fuse box. For the dome light you will want to run a wire straight from the vehicle...
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  • How to Determine What the Orange Wire of Trailer Wiring Circuit is on Trailer with 9-Way
  • The colors of the wires used for wiring up a trailer can vary widely among trailer manufacturers. Especially on a trailer as old as yours where someone could have rewired the connector with whatever wire was convenient. To determine the function of the wire you can trace it back to see where it terminates or you can use a jumper wire from the positive post of a vehicle battery to put 12 volts on that wire to see what circuit activates. Typically on a trailer with a 9-way installed...
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  • What is the Correct Trailer Wiring Harness for a 2012 Kia Sportage SX
  • For the 2012 Kia Sportage SX model, the correct trailer wiring harness is Upgraded Circuit Protected Tail Light w Converter Hardwire Kit, # 118526. Installation is not very difficult. The only real time consuming part is running the power wire to the battery. The power wire must be connected to the battery, no other power source has been tested and approved. I have included an FAQ that should help.
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  • 4-Way Wiring Harness For 2012 Jeep Liberty
  • If you do not have a 7-way connector at the rear of your 2012 Jeep Liberty, I recommend the Tow Ready Custom Fit Vehicle Wiring, part # 118554. This requires no splicing or cutting for installation and will give you a 4-way connector on your Liberty. I have attached a link to an installation video for this harness on a 2012 Liberty you can check out. Due to the wiring on your Liberty, and if it did not come with a towing package, a powered converter is required to protect the vehicle...
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  • Trailer Wiring Harness Option for a 2014 Volkswagen Passat TDI SE
  • I wish I had better news, but there have been no updates to wiring harness availability for the 2014 Volkswagen Passat. There is not a huge demand for wiring harnesses for this vehicle, so it has not been very high on the priority list for wiring harness manufacturers. I spoke with my contact at Tow Ready (a wiring harness manufacturer) and he said the Passat has Pulse Width Modulation (PWM) wiring, so the best option would be their Heavy-Duty Modulite Wiring Harness, # 119190KIT. We...
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  • Installing a Trailer Wiring Harness on a Trailer with Yellow, Black and White Tail Light Wires
  • When it comes to tail light wiring, black is usually the running light circuit and white is usually ground. That would leave the yellow wire for the brake light and turn signal. On trailers, the turn signal and brake lights are combined on the same circuit. When installing a harness like the Optronics Wishbone 4-way Harness, # A35W42B, the green wire would connect to the yellow wire on the passenger side tail light and the brown wire with the green stripe would connect to the black...
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  • Wiring And Light Recommendations For Small Utility Trailer
  • If you want to install a new 4-way connector on your utility trailer I recommend using something like part # A35W42B. This is a 35 ft 4-way wiring harness. I have attached a link to a helpful article that explains trailer wiring you can check out. For trailer lights I recommend using LED lights. they are very durable and raw much less power than incandescent lighting. For the right hand side of the trailer I recommend a light like part # STL8RB. This is an 11 diode light that features...
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  • Troubleshooting No Running Lights on a Trailer Towed by 2006 Volkswagen Jetta
  • Most likely there is a ground problem on your trailer wiring. I would recommend you check and make sure all of the light assemblies are grounded to a clean metal surface. Also check the main ground of the trailer for the same thing. If that doesn't fix the problem then I would recommend you use a circuit tester like part # 3808 to test the circuits of the 4-way on your vehicle. See the video I attached to see how this is done. If the voltage checks out there the problem is on the...
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  • Troubleshooting Malfunctioning Trailer Brakes
  • There are several different reasons why your trailer brakes might not be working. The controller could be bad or improperly wired. The trailer connector on the trailer or the vehicle could be damaged, mis-wired, dirty or corroded. The wiring on the trailer itself could be faulty. The brake magnets might be excessively worn. There are many possibilities. If you would reply with the year, make and model of your vehicle, and a description of exactly what the controller is doing, I'd be...
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  • Replacement 7-Way Connector for 2007 Chevrolet Silverado
  • The Hopkins Endurance Multi-Tow Trailer Connector, # HM40920, is a twist-in socket. If you need a slide in replacement 7-way/4-way connector for your 2007 Chevrolet Silverado, you can use the Hopkins Custom Fit Vehicle Wiring, # 30955. I have attached a video for you to check out.
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  • Availability of Trailer Wiring Harness for 2015 Lexus RX350 F Sport
  • The hitch manufacturers have not yet completed testing to determine if trailer wiring harnesses from the 2014 model carries over and will work with your 2015 RX 350. If the connector is located on the driver's side frame member near the bumper and the connector is compatible with the plug of the # 56083 as shown in the photo I provided, it's likely that the # 56083 trailer wiring harness would be compatible. However, I cannot provide any guarantee, as Curt hasn't approved it as a fit. If...
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  • Finding and Repairing Poor Ground Connection on Trailer
  • What you're describing is the classic symptom of a poor ground connection somewhere in the trailer wiring on the vehicle or on the trailer. Everything works fine until you draw maximum amperage through the system by turning on the running lights. Check the ground connection on the vehicle where the trailer connector attaches to the vehicle frame or chassis. Make sure this connection is tight and not corroded. Trace the white wire from the trailer connector back onto the trailer tongue,...
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  • Troubleshooting Curt Trailer Wiring Harness Install on a 2000 Nissan Xterra
  • The red wire of the Wiring Harness part # 56146KIT that you referenced should be run to the brake light circuit of your 2000 Nissan Xterra. If you are missing that connection I would recommend you verify that the other wires are securely connected to the correct circuits. Especially the black wire that needs to run to the positive terminal of your vehicle battery. If this connection isn't made, or the fuse isn't installed in the fuse holder the converter will not work. I attached an...
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  • Could a 7-pin European Connector be Adapted to a Nato 12 Pin Trailer Connector
  • I am sure there is a way to do it. We don't carry either style of connector though so I wouldn't have any parts I could recommend. You would need to track down the two connectors you would need. One that would plug into the your Range Rover and then one that would plug into your 12 pin Nato connection. You would need to also get wiring diagrams for both plugs and wire them by function to each other. I attached a couple pictures that should be helpful
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  • How to Wire a New 4-Way to a Sea Doo Trailer that Has Double Wires
  • Sounds like you need to redo the wiring of the new 4-way completely. Typically, the green wire runs to the right turn/stop circuit, the yellow runs to the left turn/stop circuit, the brown wire runs to the taillights and the white is the ground that runs to the trailer frame. If you have double wires or, "wishbone wires," on your trailer but the new connector only has single wires you will want to either twist the double wires together, or use a butt-end connector to run both of the...
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  • Adapter to Go from 6-Way Square on Tow Vehicle to 4-Way Flat Trailer Side Connector
  • It sound like you want the opposite of adapter # 30104. That would mean your tow vehicle has a 6-Way square connector. What you can do is use # 37995 which has both the vehicle end and trailer ends. On the trailer end, you can wire the loose wires to a vehicle side 4-Way, # HM48190. Then you will have a 6-Way square to 4-Way flat adapter. The other option is to just replace the 4-Way flat on the trailer with the trailer end 6-Way that comes with # 37995.
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  • No Brake Light Function on 6-Way Round Trailer Connector on Chevy Motor Home
  • It sounds like there is a blown stop light fuse on the Chevy motor home. Use the owners manual or the legends on the power distribution box lid/in-cab fuse panel to locate any and all tow package wiring fuses so you can check them. If that is not the problem it is possible that the 6-Way on the motor home has separate brake light and turn signal circuits. You would need to test the other pins to determine if any of them carry a brake light signal. If there are separate circuits for...
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  • Does Computer have to be Flashed After Replacing Factory Brake Controller On 2008 Ford F-350
  • The factory integrated brake controllers, especially the first generations of them, performed poorly as you have described. They are just not designed well and thus not effective. On newer trucks they have gotten better but I would still say an aftermarket controller is superior. When you install an aftermarket controller in your 2008 Ford F-350 the factory controller will have to be disconnected. This will cause a fault code to appear. That fault code will have to be cleared by your...
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  • Tekonsha P3 Controller Stays On with Bulb-Out Sensor Adapter Installed
  • The same reason the part # C57003 prevents your P3 # 90195 from falling asleep would be the same reason the # 20142 would do the same. Both of these adapters have resistors installed on the circuits. The only solution I could make for you would be to remove the # C57003 from your vehicle when not in use. Also, the LED display of your brake controller puts such a miniscule amount of draw on your vehicle that it would take weeks before it would adversely affect your battery life.
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  • Trailer Wiring Diagram for 1975 Blair Tandem Axle Stock Trailer
  • The linked article on trailer wiring will give you diagrams and specifics about wiring a trailer with a light kit such as # 432800 from Peterson. We also offer install kits like # HM51020 that can help simplify the process of re-wiring.
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  • Adapting a 6-Way Square Jayco Trailer Connector to 7-Way on Vehicle
  • The easiest thing to do would be to replace the 6-Way square on the Jayco trailer with a 7-Way, # PK12706. You can adapt the 6-Way Jayco to the 7-Way on your vehicle. But it will take a little bit of work. First, you will need 6-Pole Square Trailer Wiring Connector Kit # 37995 because the Jayco square plug doesn't fit any other 6-Way square. This part has both the vehicle end and the trailer end which will both be needed. Then you will need a trailer side 7-Way such as # PK12706....
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  • What Gauge Wires Should be Used with the Hopkins Connector part # HM48480
  • There really isn't a set maximum gauge wire that could be used on the Hopkins Connector part # HM48480. Most people will use 10 gauge wire as the max gauge for the brake output, 12 volt accessory, and ground wires. So you could easily use that gauge or slightly smaller or bigger without a problem.
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  • 7-Way to 4-Way Round Adapter Recommendation for Trailer Lights on a Camper
  • Yes, the Hopkins Endurance Flex-Coil Trailer Connector Adapter # HM47043 is exactly what you need to plug into the 4-way round you have on your Palomino slide-in camper and then to the 7-way on your truck. This will power the taillights of your camper.
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  • Adding Electric Brakes to Second Axle of Tandem Axle Carson Trailer
  • You can certainly install brake assemblies and drums on the rear axle of your tandem axle trailer, and they'll bolt right up as long as the axle has a brake mounting flange installed on it. If the rear axle uses the same bearings, and the hubs have the same wheel bolt pattern, you can use the same # 23-469 and # 23-468 brake assemblies and # 84556UC3 hubs you used last time.
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  • How to Find the Stoplight Circuit on a 2013 GMC Terrain for Brake Controller Installation
  • Use a circuit tester like part # 3808 on the wire in the # 11 terminal on the black BCM connector, as shown in the diagram I provided. The wire colors can vary during a production run, which is why we typically recommend that folks wire by function, not by wire color. As an alternate method, you can use a fuse tap like part # F2526 on the CHMSL (center high mounted stop lamp) fuse in the fuse box. The lid of the fuse box should have a legend that will tell you which fuse location is needed.
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  • 7-way and 4-way Install Harness Recommendation for a 2005 Chevy Silverado
  • If the 7-way on your 2005 is a twist-in style connector then yes, the Hopkins Endurance Multi-Tow Twist-Mount 7-Way RV and 4-Way Flat Trailer Connector # HM40920 that you referenced would work as a replacement that would give you a 7-way and a 4-way. If it's not a twist-in style you could use the part # 30955.
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  • How to Find the Reverse Light Circuit on a Vehicle
  • That information I do not have, but I can help you determine which wire it is. You will need to use a circuit tester like our part # 3808 to test all of the wires going to the reverse lights. Which ever one has voltage only when the reverse lights are on is the one you are looking for.
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  • Installation Instructions for the Tow Ready Wiring Harness part # 119178KIT
  • I attached a link to the right that has the installation instructions for the Tow Ready Wiring Harness part # 119178KIT you referenced. I also attached an install video that shows this harness being installed on a similar Saturn as yours. Your local hardware store should be able to set you up with a self-tapping screw to use for the ground wire as well.
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  • Installation Instructions for 4 Pole Harness Kit # 119179KIT on 2014 Subaru Impreza
  • I have attached the installation instructions for the Upgraded Circuit Protected Modulite with 4 Pole Harness and Hardwire Kit, # 119179KIT. You will see the link off to the right. As for an installation video, I have attached one that will go through the basic steps on how to test wires, where to connect the wires, and routing. Please keep in mind that the installation for the 2014 Subaru Impreza won't be exactly like the one on the video since that was on a different vehicle but this...
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  • Where to Find the 12 Volt Power Wire for 7-Way Wiring on a 2012 Ford Expedition
  • Actually the color wire you are looking for to power the 12 volt power circuit of the 7-way adapter part # 37185 is orange in color and will be right near where you found the blue wire for the brake controller. See the picture I attached plus the FAQ link to the right that details how to install a brake controller in an Expedition like yours. The other solution you have would be to run a 10 gauge wire like part # 10-1-1 (sold by the foot) through a 40 amp breaker like part # PK54540...
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  • Powering Third Brake Light on a 1985 Scamper Truck Bed Pop-Up Camper
  • The wire that attaches to the red wire on a brake controller is a dedicated brake light only wire so it could work. But I would not use it for a light and a brake controller at the same time since it is not meant to have the extra draw on it. Another option is to take a combined circuit with brake light and turn signal and use a converter such as # 118158. The output side would provide a red, brake light only wire. I have had customers tell me that you would need both the green and...
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  • Parts Needed to Install a 7-Way on a 2015 Subaru Outback Wagon
  • If you are looking for a way to 7-way trailer wiring on your 2015 Subaru Outback Wagon you will first need to start with a 4-way. For that you will want the part # C56040. (see install video). Now if your trailer doesn't have brakes all you would need to convert this to a 7-way would be the part # 37185. If you do need a 7-way because your trailer has trailer brakes you would instead need the part # ETBC7. This comes with a length of loom. For a brake controller I would recommend...
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  • 4 Way Wiring Kit for 2013 Harley Davidson Electra Glide Ultra Limited
  • Although we do not have a plug and play wiring option for your 2013 Harley Davidson Electra Glide Ultra Limited, I have a solution for you. You could use the Upgraded Circuit Protected Taillight Converter with 4 Pole End, # 119178KIT, on your Harley. Since motorcycles have separate turn and stop lights, this wiring harness will convert this separate system to the common combined system on most trailers. To install part # 119178KIT, you will need to start by testing the wires on your...
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  • Wiring 12 Volt Power to Leer Camper Shell on a 2013 Chevy Silverado
  • You have a couple of options to get 12 volt power to the camper on your 2013 Chevy Silverado. First, if the truck has a functioning 7-Way trailer connector you can tap into the 12 volt power wire behind the 7-Way. The 12 volt circuit is in the 11 oclock position if looking at the back of the 7-Way. The other option is to get the power direct from the battery. I have included a link to a help article that explains where the 12 volt connection is made to the battery for the trailer connector....
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  • Why Would a Right Trailer Taillight Stay on After Vehicle is Turned Off
  • Typically when a trailer function stays on after the vehicle has turned of the problem is a fried aftermarket 4-way converter box. Or, if the lights are LEDs sometimes you will see the lights dimly lit. If you have an aftermarket 4-way converter box installed for trailer wiring on your vehicle most likely it has shorted out. Check out the video I attached that details how to test it. These don't usually short out for no reason, before you replace the harness you will want to find...
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  • Getting 12 Volt Power to 7-Way Trailer Connector on a 2003 GMC Sierra
  • To get the 12 volt circuit working on the 7-Way trailer connector on your 2003 GMC Sierra you will first need to go under the hood and remove the covers on the power distribution box. After removing the main cover and the cover under that you will see a post on the passenger's side front corner. There will need to be a 40 amp fuse in the nearest location to that post. If there is no wire attached to that post then you will need to follow the help article I have linked to the right. Step...
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  • Trailer Wiring Recommendation for a 2013 VW Passat TDI SEL
  • Although it hasn't been confirmed to fit you 2013 Volkswagen Passat TDI we were able to install a Curt Wiring harness part # C56201KIT on a 2013 VW Passat and it worked just fine. I attached the install video that you referenced that shows this. Since it hasn't been confirmed by Curt all we can say is that it should work for you. The # C56201KIT is a universal kit that can adapt to most configurations.
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  • Right Turn Signal Not Working on 7-Way After Installing 4 to 7-Way Adapter # 30717
  • Since the brake lights and turn signals are combined on the same circuit, one for each side (3 oclock and 9 oclock pins) the right turn signal not working on the 7-Way is a little strange but not without precedent. It is likely a ground issue. Make sure that the white ground wire on adapter # 30717 is attached to a clean and corrosion free bare metal surface. Also, make sure the vehicle side 4-Way is clean and free of corrosion as well. Since the turn signal functions on the 4-Way...
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  • 6-Way Round to 7-Way Flat Adapter Recommendation
  • The # 47435 that you referenced would be exactly what you would need. This will plug into the 6-way round on your tow vehicle and will give you a 7-way connector for your trailer to plug into.
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  • Trailer Wiring Harness Option For a 2009 Volkswagen Jetta SportWagen
  • The best trailer wiring harness option for your 2009 Volkswagen Jetta SportWagen is the Tow Ready Heavy-Duty Modulite Harness Kit, # 119190KIT. This is a splice-in harness and I have attached an installation video of this harness on a 2012 Volkswagen Jetta to give you an idea of what is involved with the installation. I'm sorry, but there are no plug-in style trailer wiring harnesses available for the Jetta SportWagen. We carry all of the major trailer wiring harness manufacturers and...
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  • Troubleshooting Brake Controller Making Noise And Causing Brake Lights To Blink
  • To help troubleshoot your brake controller, I have attached a helpful article that explains some of the common problems that can occur with a brake controller along with some methods that can be used to correct them. I recommend using a circuit tester like part # 3808. For a hard wire installation you will want to test each of the wires and make certain they are installed properly. Any connections that are not secured properly can cause a number of problems. It is equally important...
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  • What is the Difference Between Hopkins # HM47365 and Pollak # PK12716 Wiring Adapters
  • Both the Hopkins # HM47365 and Pollak # PK12716 wiring adapters allow a tow vehicle with a 7-way blade-style trailer socket to connect to a trailer that is equipped with a 4-pole flat connector. Both plug in to the socket on the vehicle and provide a receptacle for a 4-pole flat trailer connector. The difference between them is that the Pollak adapter is a single piece while the Hopkins adapter uses two separate sections linked by a short length of wiring. In some applications these...
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  • Installing 7-Way Trailer Connector on 1999 Explorer w/ 12-Volt Power Circuit for Trailer Battery
  • To install a 7-way trailer connector on your Explorer, you'd first need a functioning 4-pole. If you don't have a 4-pole, you can install one using part # 118345. At this point, you'll need to decide if you need the 7-way to provide the lighting and battery circuits only to the trailer, or if you need to install a brake controller on the Explorer as well. If you just need the lighting and battery feed circuit, you can use an adapter like part # 37185. The adapter would plug into your...
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  • Determining Functions of Wires on a Boat Trailer to Install a 4-Way Flat Connector
  • Since there is no standard for wire colors and functions you will have to determine the function of each wire on the boat trailer. There are two ways to do this, you can trace each wire back to see where they all terminate. Or you can apply 12 volt power to each wire and see what lights up. On a Trailer side replacement 4-Way, such as # 18004, the one covered pin is the ground (white is most common). Next to that is running lights (usually brown). Then you have left turn and brake lights...
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  • Adapter Recommendation to Connect 30 Amp System to a 50 Amp RV System
  • The Arcon RV Power Cord Adapter # AR14368 that you referenced will connect to a 30 amp male plug and then the other side will connect to a 50 amp female plug. If you need the opposite configuration you would want the part # AR14372. Based on your question I believe this is the adapter you need. See review video.
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  • Trailer Brake Lights Do Not Work when 2009 Volvo XC70 Rear Hatch is Closed
  • You have a 2009 Volvo XC70 and the video is on a 2011 model year so it is very possible that installation of a trailer wiring harness such as # 56146KIT would not be exactly the same. In this case though it is moot since it is just a matter of locating the proper wire. So what you are saying is that the vehicle has a feature that moves where the brake lights are illuminated based on if the hatch is open or not. This is actually not uncommon. There should still be a wire with the others...
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  • Recommended 7-Pole Connector Compatible with Curt T-Connector Vehicle Wiring Harness
  • Yes, the Curt 4 Pole to 7 Pole Adapter, part # C57674, that you referenced is a confirmed fit with the Curt T-Connector Harness with 4-Pole Flat Trailer Connector, # C56040. You will plug the adapter into your existing 4-way. If you want to use the other functions you will need to hardwire the remaining four wires. Here's how. The White wire with the ring terminal is the ground. The Black wire is the 12-volt power wire and goes to the positive battery terminal via a 40 amp circuit breaker....
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  • With Running Lights or Brake Lights On Turn Signals on Trailer Alternate
  • Tail light ground wires are usually white so that doesn't seem odd. This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The...
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  • 4-Pole Trailer Wiring Harness for 1972 International Scout II
  • For your 1972 International Scout II we offer a 4-pole pigtail wiring harness kit that includes a circuit tester to allow proper identification of the function carried on each vehicle wire (wire colors are not fully standardized so testing is the way to go). I have linked a representative installation video as well as a video on how to use the tester. This 4-pole can be used with mounting bracket # 18144 from TowReady.
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  • Total Length of the TorkLift Wiring Harness Extension # TLW6042
  • The 48 inches of length that the TorkLift Wiring Harness Extension # TLW6042 has is the distance from end to end including the connectors.
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  • Recommended Trailer Wire Kit For 2010 Audi A4 Avant Or 2010 Volkswagen SportWagen
  • If you are talking about purchasing a 2010 Audi A4 Avant wagon, we do offer a trailer wiring kit that will work for you. It is the Curt PWM Powered Converter with Wiring Kit, part # C56201KIT. This kit includes all of the hardware needed for installation. I have also included a helpful article that you can check out. To make certain you are using the correct wires I recommend using a circuit tester like part # 3808. If you decide on a 2010 Volkswagen Jetta SportWagen, the trailer...
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  • Replacing Factory 7-Way with a 4- and 7-Way on a 2013 Nissan Frontier
  • The factory 7-Way on your 2013 Nissan Frontier should be able to come apart like in the picture I have included. If it can then you can replace the 7-Way part with # HM40975. Or you could just use an adapter, # PK12716, for times when you need a 4-Way flat.
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  • Recommended Trailer Wiring Harness for 2011 Dodge Journey with LEDs
  • It is always a good idea to use LED lights on your trailer as they last longer and tend to illuminate sharper than incandescent lights and draw less power from your vehicle battery. The Hopkins Active Taillight Converter # 46255 is a confirmed fit for your 2011 Dodge Journey with LED lights. This system is designed to splice into the existing wiring on your vehicle, and provide a 4-way connector at the rear of your Dodge Journey. It also isolates and protects the tow vehicle from trailer...
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  • Parts Needed to Install a 7-Way on a 2011 Subaru Outback Wagon from Scratch
  • If you are starting from absolutely no trailer connector on your 2011 Subaru Outback Wagon you will want to first start with a 4-way. For that you will want the Curt Harness part # C56040. Now to convert to a 7-way that will also have a 4-way connector available you would want the 7-Way Adapter part # 37185. This will plug into the 4-way you installed and then so that your wireless brake controller would have power you would only need to run the black wire of the # 37185 to the positive...
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  • Troubleshooting Trailer Wiring That Blows Vehicle Fuse When Brakes are Applied
  • You are overdrawing the brake light circuit with the load you are putting on it from your trailer wiring. This is either because your trailer has a short on it that needs to be fixed, or you are just overdrawing the circuit. Most likely it's just overdrawing, but you should still inspect the wiring of the trailer looking for any cut or exposed wire and fix as necessary. Now if the problem is just that you are overdrawing the circuit you have two options. You can convert your trailer...
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  • Trailer Wiring Harness Recommendation for a 2005 Cadillac SRX V8 Rear Wheel Drive
  • We have some trailer wiring harnesses that have been confirmed to work with the 2005 Cadillac SRX, but they are all the universal hardwire kits, not T-connector style harnesses. For your SRX, we recommend installing the Curt Circuit Protected Tail Light Wiring Kit, # 56146KIT. We have installed this harness on a 2004 SRX, so I attached the installation video for you to check out. I have also attached the installation instructions. The installation for the 2004 SRX will be the same for...
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  • Compatibility of Bargman # 54-77-003 7-Way Connector With # 50-87-004 Vehicle End Socket
  • You can indeed install the Bargman 7-way connector # 54-77-003 onto the # 50-87-004 Sealed connector. However, there is a connector loop like this that's already constructed, part # 20027. If you're wanting to use this item to install a 7-way connector in your truck bed for a fifth wheel, we offer T-Connectors like # 41157 that would plug inline with the truck wiring harness that feeds the 7-way connector on the bumper. Some of these are vehicle specific, so if you'd be interested in...
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  • Wire Colors and Functions for 4 Wires Pulled Out of a Trailer Connector
  • Is this the trailer side connector? It is likely that you have white for ground, yellow for left turn and brake lights, green for right turn and brake lights, and the 2 brown wires are running light circuits, one for the left side (yellow/brown) and one for the right side (green/brown). I imagine that you have a 4-Way flat connector. On the trailer side the one covered pin is the ground, next to it is the running light circuit, then left turn/brake, and last is right turn and brakes. If...
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  • Adding a 7-Way and Brake Controller to a 2012 GMC Terrain and Old Trailer
  • Trailers have combined turn signals and brake lights on the same circuit so you wouldn't tap into one of those otherwise the brakes would turn on with the blinker like you said. You are going to have to add a 7-Way connector to the 2012 GMC Terrain and to the trailer. And you will also need a brake controller. Since your Terrain already has a 4-Way you will just need # ETBC7 to add the 7-Way. I have included some links that show and explain the ETBC7 installation as well as the brake...
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  • Wiring In a New Trailer Side 5-Way Trailer Connector
  • Wiring by color can prove to be a bad idea since there technically isn't a standard for wire function and color. On Hopkins trailer side 5-Way, the white wire is the ground, brown is for running lights, yellow is left turn/brake lights, green is right turn/brake lights, and blue goes to the reverse lockout solenoid like you said. To determine the functions of the wires on the trailer you could either trace each one back to see where each goes. Or you could apply 12 volts of power...
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  • Trailer Lights Work when Vehicle Is Off, But Do Not Work When Vehicle is On
  • That is interesting. What about testing the 4-Way without the hazards on. Instead, have a friend sit in the vehicle and operate each light function with the vehicle off and with the vehicle on. It could be an issue with just the hazards on. I have included a link to a help article that explains how you can go about troubleshooting the trailer wiring. If it is a bad ground, Ground problems normally show up when there is more draw on a system such as when you have the running lights...
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  • Difference of 4-Way Trailer Connector with 4 Wires Compared to 4-Way with 5 Wires
  • The 4-Pole Trailer End Connector # 18004 is meant as a replacement for a trailer side 4-Way connector that has been damaged. That is why it is so short at 12 inches long. This is a standard 4-Way with one white ground wire, one brown running light wire, one yellow left turn/brake light wire, and one green right turn/brake light wire. If the one you are replacing has 2 running light wires then you would want a wishbone harness, # W002230. I have included video reviews of both harnesses...
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