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Expert Answers about Wiring


  • Is WesBarg 7-Way, RV-Style Coiled Connector Long Enough for Junction Box 2-1/2 Feet Back on Trailer
  • If the junction box is 2-1/2 feet back from the front of the trailer then that would leave just 3-1/2 feet of the coiled cable # WG54006-043 to go from the front of the trailer to the vehicle and still have slack to make turns. That might not be long enough so I would add some additional wire, such as # DW04914-1, sold by the foot, to ensure there is enough slack.
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  • Using Separate Brake Lights and Turn Signals on Home Made Tear Drop Trailer
  • The best solution is to use a standard combined wiring harness on the 2004 Toyota Tacoma and then separate out the signals on the trailer side. That way your truck will still have a standard connector in case you need it in the future. Since you need lights and 12 volt power I recommend going with a 7-Way which is very common. To add a 7-Way to your truck you will first install a 4-Way using # 118379. Then you will need 20 feet of wire # 12-1-1, and a 40 amp circuit breaker # PK54540....
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  • Is There Any Electrical Current At Power Cord Plug On Jayco Motorhome When Unplugged
  • The best way to make sure you do not have any current at the plug or on the line is to find the breaker box on your RV and make sure you cut the power to the circuits by flipping the main off. There shouldn't be any current back feeding to the wires on the plug you want to replace but you can use a voltmeter to make sure. The Power Grip Replacement RV Power Cord Plug w/ Handle, part # CAM55245 features a handle that makes it easy to plug and unplug the cord from the receptacles when needed.
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  • How Many Wires Inside Wesbar Coiled 7-Way Flat Pin Blade to 5-Flat Adapter # 787207
  • The Wesbar Coiled 7-Way Flat Pin Blade to 5-Flat Adapter # 787207 actually has 5 wires. This adapter takes a trailer-side 7-way plug and mates it to a 5-pole flat connector. All 5 pins on the 5-pole are connected at the 7-way side but a 12V power feed and trailer brake circuit are NOT supported. Two pins on the 7-way are inactive. If you need 7-wire jacketed cable we offer Deka # DW04914-1 which is sold by the foot and that has no connectors included. Or if you need a 7-way with the...
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  • Recommendations For Re-Wiring Horse Trailer With Brakes
  • Since you said you have a 7-way blade connector on your Silverado I would start with the 7-Way Molded Trailer Wire Connector, part # H20046. This is an 8 ft long harness with the 7-way trailer connector. If you need a shorter harness you can check out part # H20044 which is a 6 ft long harness with the connector. You will want a circuit tester like part # 3808 to make sure you match the wiring on the trailer side connector to the functions on the vehicle connector. I then recommend using...
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  • Trailer Lights Not Working When Connected to a 2002 Pontiac Grand Am
  • the issue that you are having could be the result of a bad ground connection that the wiring harness for the 2002 Pontiac Grand Am cannot overcome but the one on the truck can. Since vehicle manufacturers can use any wire color they want for any function I cannot tell you which wire colors were used on your specific model. So what we will have to do is test the wiring using a circuit tester such as # 3808. Once you have determined the wire functions you can make the connections with...
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  • 7-Way Recommendation for a 2001 Toyota 4Runner with 4-Way
  • 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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  • How to Make a 6-Way Square to 4-Way Adapter
  • We don't carry an adapter like what you are interested in, but you can pretty easily make one. You would just need a 6-way square like the part # 37995 and then a 4-way like part # HM48145 that you referenced and hardwire he two together. If your trailer happens to be a Jayco you could use the part # 30104 though.
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  • Replacement 7-Way Recommendation for a 1997 Jeep Cherokee
  • Since your 7-way does not have a round connector that would allow it to easily disconnect from your wiring harness you would want to go with a replacement 7-way that has a lead of wires like the part # HM40975-11998 so that you can wire your vehicle's wiring to the 7-way. You will need to use a circuit tester like part # 3808 to test the functions of all of the wires on your vehicles trailer wiring so that you can wire up the new 7-way by function.
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  • Only Left Trailer Light Shows Power with 1999 Chevy Tahoe
  • There are several things you can check to determine why a trailer wiring circuit is not working. First, you will want to test the vehicle side trailer connector using a circuit tester such as # 3808. Have someone sit in the vehicle and go through the light functions while testing. If everything works on the vehicle you can move on. If a circuit is not working on the vehicle then make sure the trailer connector is clean and free of corrosion inside and out and inspect the wiring, fuses,...
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  • Where to Get 3rd Brake Light Signal for Camper Shell on a 2009 Chevy Silverado
  • There is a dedicated brake light only wire located up under the dash and to the left of the steering column on your 2009 Chevy Silverado. It is with a wire bundle held together with a white tag. There should be an orange or light blue wire that is the center high mount stop lamp wire (CHMSL) that you could use. It is there on your truck whether it has a brake controller or not. You would need to attach wire to the end of it, route it through the firewall, under the truck, and over to...
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  • What are the Functions of the Wires on a Gooseneck Trailer with 7 Wires
  • There isn't a standard for trailer wiring color but the likely functions of those wires are red for left turn/brake lights, yellow for reverse lights, brown for right turn and brake lights, green for running lights, black for 12 volt power, blue for output to trailer brakes, and white for ground. On the trailer side you could either trace each wire back to determine the function of each or you could use a separate 12 volt battery and connect each wire, one at a time, to the positive...
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  • Replacement 6-Way Square Connector Recommendations for a Trailer
  • For a set of replacement 6-way square connectors you would want the part # 37995. This part number comes with both the trailer and the vehicle side connectors so you would have a spare for your vehicle as well. I attached a review video for you to check out as well.
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  • Trailer Wiring Recommendation for a 2015 Subaru Impreza
  • At this time the only trailer wiring harness I can recommend for a 2015 Subaru Impreza hatchback is a universal kit like the part # 119190KIT that will hardwire to the vehicle. The part # C56111 is for older model Imprezas so I cannot recommend it for you. The Curt Hitch part # 11286 that you referenced has also been confirmed as a fit for your vehicle.
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  • 7-Way Blade to 4-Way Flat Adapter to Tow Boat Trailer with 2010 Chevy Silverado
  • That is a standard RV style 7-Way trailer connector on the 2010 Chevy Silverado. For an adapter you can use # PK12716 to go to a 4-Way flat on your boat trailer. I have included a link to a video review of this adapter for you.
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  • 2008 Chevy Silverado 2500 factory Brake Controller Shows Service Trailer Brake System
  • There could be a short somewhere that is causing that error message to show up. The most likely culprit is a dirty or corroded trailer connector. Make sure that the truck AND trailer connectors are clean and free of corrosion inside where the wires attach and on the pins. If it occurs when a trailer is connected then it could be a problem with the brake magnets or trailer wiring to the magnets. Make sure the wiring is in good shape and not pinched or frayed and that the ground wires...
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  • Troubleshooting Trailer Wiring On 2004 Pontiac Montana
  • The first thing I would recommend is to try connecting the trailer to another vehicle to see if the same problem exists. If not then the problem is going to be found on the Montana. If the wiring harness is hard-wired you will want to check the ground to make sure it is corrosion free and attached to a clean bare metal surface. Check the connector to make sure there are no signs of corrosion or damage to any of the pins and correct as needed. Since the trailer harnesses we offer...
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  • Recommended Trailer Wiring Harness w/ 4-Pole Connector for 1998 Toyota 4Runner
  • The Hopkins # HM48895 is a universal fit application that could be used on your 1998 4Runner. However, I personally would prefer the plug and play option from Tow Ready, part # 118341. This option would plug inline at the connectors between the vehicle wiring harness and the taillight assemblies for a much easier installation. No cutting or splicing is required. Since your trailer has LED taillights, you might experience hyperflashing if your 4Runner is equipped with a bulb out sensor...
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  • 4-way Round Trailer Connector to 4-way Flat Connector
  • I have a solution for you. However, we do not have an adapter to fit your 4-pin round connector on your trailer. Because of the rarity a 4-way round connector, I recommend either cutting off the 4-way round and attaching a 4-way flat, or splicing a 4-way flat into your wiring in addition to the 4-way round. To attach a 4-way flat, you can use part # HM48035. If you remove your 4-way Round connector, you will want to use butt connectors # DW05744-5. If you want to add the 4-way Flat...
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  • Converting a 5-Way Trailer Connector on a Honda Goldwing to a Standard 4-Way Flat
  • Since motorcycles have separate turn signals and brake lights they will only work with a trailer that either also has a separate system or would require a converter to make the trailer and bike compatible. Right now, the separate brake light circuit has no where to go on the trailer. It would be easiest to convert the connector on the bike using converter # 119178. On this converter, the red input wire is for brake lights only from the bike, green is right turn signal only from the...
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  • Recommended Trailer Wiring Harness for 2014 Ford Explorer Without Tow Package
  • Your Explorer might have the rectangular plug located to the right of the muffler on the passenger side of the vehicle (see linked video). If it does, you could use the # 118540 harness from Tow Ready. The harness is a plug and play install, pretty easy. If you do NOT have the connector, you'll need to hardwire the trailer connector in place using the # 119147KIT wiring harness. I've linked you to a video showing that harness being installed on a different vehicle. The procedure would...
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  • Does Curt Universal Trailer Wiring Harness have Built-In Circuit Protection
  • Yes, Curt trailer wiring harness # 56200 does have built-in circuit protection. To complete the installation of this harness you will also need wiring kit # 55151.
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  • Recommended Adapter To connect 4-way Flat Trailer Connector To 7-way Round Connector On 2002 Volvo
  • If you have a 7-way round pin connector on your Volvo, the adapter you can use is part # 118709. If the vehicle connector is round but has blade connectors and you want to attach a 4-way flat connector on the trailer you need part # PK12716.
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  • Troubleshooting Trailer Light Running Light Circuit Not Functioning
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • 4-Way Adapter Recommendation for a 2004 Jeep Wrangler
  • A square 7-way is not a standard style of trailer connector. It could be possible that you have a round, blade-style 7-way and then all you would need to convert it to a 4-way would be a # 47345. Or you could just install a new 4-way with the part # 118409 and bypass the 7-way all together.
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  • Trailer Turn Signals Blink Opposite of What they are Supposed To
  • It sounds like there are either some crossed wires or a bad ground (weird things can happen when there is a ground problem). On a trailer side 4-Way the covered pin is the ground. Next to it is the running lights. The third pin is left turn signal and brake lights, and the last pin is right turn signal and brake lights. It is possible that either on the trailer or vehicle the last 2 functions are swapped. Also make sure that the vehicle side and trailer side connectors are clean...
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  • Ball Mount and Trailer Connector Adapter Recommendation for 2014 Mercedes GLK 350
  • It is important to choose a ball mount with the correct rise or drop needed so you can tow your trailer level. You will want to measure your hitch height, as well as the height of your trailer's coupler. The difference between these two heights will let you know which drop or rise you will want. I have attached a help article on finding the correct ball mount. You will also want to know the weight of the trailer you are towing. This is important to make sure you do not exceed the towing...
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  • Trailer Lights Turn Off when Headlights are On and Brake Pedal is Pressed
  • This sounds like a ground issue or a possible short. 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. A short could come from a dirty or corroded trailer connector. 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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  • Trailer Wiring Harness for a 2007 Volkswagen Eos
  • Given the options for trailer wiring harnesses for your 2007 Volkswagen Eos I recommend going with the Tow Ready harness # 119179KIT over the Hopkins harness # 46255. The Tow Ready harnesses are more popular, reliable, and in this case it costs a little less. I have linked a video that you can use as a guide to help with installation. If the wiring is the same on your 2007 as it is on the 2008 convertible Eos then on the left side the yellow wire is the turn signal, brown or black is...
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  • Troubleshooting No Power to Pins on Seven Way Connector
  • If you have a Chevy Silverado there may be some additional connections you need to make under the hood in order to make the 7-Way fully functional. I have included a link to an FAQ article that will help. If everything is connected properly and you are still not getting power at the 7-Way, you could bypass the factory connection. You can cut the wire a few inches forward of the trailer connector. You need the wire in the 11:00 position if looking at the back of the 7-Way where the wires...
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  • 7-Way Recommendation to Replace 4-Way on a Trailer
  • Sounds like you have a trailer that currently has a 4-way and a tow vehicle that has a 7-way. Based on what you said you are looking for the part # H20046 would be what you would need. You would just need to tape up the unused wires. I attached a help article on trailer wiring for you to check out as well.
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  • Difference Between Pollak Trailer Wiring Connectors
  • The # PK12707 and # PK12-707E are very similar. Both are vehicle end trailer connectors with RV-style color configuration. Both connectors will need to be hardwired to the vehicle. I called Pollak to learn a little bit more about these connectors. According to my contact, the # PK12-707E is essentially an updated version of the # PK12707. The # PK12-707E has a double spring lid, versus a single spring in the # PK12707. The # PK12-707E also features a rubber seal in the lid, the lid...
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  • How to Disengage Electric Boat Trailer Brakes for Backing Up Trailer with 2011 Mercedes-Benz ML-350
  • If your boat trailer uses electric brakes such as # 23-469 it is a good idea to unplug the trailer connector from the ML-350 before you back the trailer up to launch your boat. Boat trailers are more and more often being fitted with electric brakes since they are less expensive than hydraulic brakes, but just the same electricity and water are not the best of friends. You can also simply unplug your trailer brake controller or turn its power setting down to zero when you need to back...
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  • Troubleshooting Trailer Light Flashers with 2012 Hyundai Tucson
  • It sounds like you might have a ground issue. A ground issue usually appears when there is a bigger draw is placed on the wiring. This could explain why the flashers work when the vehicle is off, but will not work when the vehicle is on. Check the white ground wire to make sure that the contact is secure and undamaged, free of dirt, and doesn't show signs of corrosion. Even if there aren't these visible signs, your ground may be in a bad location. Try moving the ground to a better location...
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  • Does Camco # CAM55382 Generator Adapter Put Out 110 or 220 Volts
  • The # CAM55382 Power Grip Generator Adapter is for 110-125V standard household current supplied to your camper by a generator.
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  • Troubleshooting Brake Controller that Only Works with Manual Override
  • Most likely the problem is on the red wire (stoplight circuit), but you can test the controller to determine where the problem is. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # 3808, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output...
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  • Can 15 Amp Plug Be Used Without 30 Amp On Camco Power Grip RV Power Maximizer
  • The Camco Power Grip RV Power Maximizer, part # CAM55025 can be used with the 110 plug only or with the 30 Amp plug only, or with both when you have the receptacles available. Using just the plug in a 110 receptacle will limit the input to 15 amps so you may have issues if you are trying to use any items that require more power. If all you need is the 30 amp connection for your motorhome I recommend part # CAM55175. This cord adapter lets you convert your motorhome plug to work with...
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  • Troubleshooting Curt 3 Wire to 2 Wire Converter
  • It sounds like the converter box on the wiring harness might have a short. I recommend checking the signals going into and coming out of the converter box. You will want to use a circuit tester, like # 40376, to test these wires. If the signals going in does not match the signals going out, your converter box has a short and you will want to replace your wiring harness. If you need to replace the wiring harness, I recommend the Tow Ready T-One Wiring Harness # 118534. This wiring harness...
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  • How to Determine Trailer Wire Functions When Rewiring Connector
  • It's pretty hard to say what the extra circuit would be since wire colors aren't always consistent among vehicles/trailers. Since you have what sounds like a trailer your best option would be to use a jumper wire from a 12 volt battery like from a car to apply voltage to all of the wires to see what activates on the trailer and then wire it accordingly to your new connector.
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  • Recommended Taillight Converter for 1993 Ford Mustang
  • It seems like you've diagnosed your problem. You'll need a taillight converter installed on your vehicle because of its separate taillight system. As you surmised, the converter takes the three signals from the right turn, left turn and brake and combines them into two signals, one for right turn and brake and one for left turn and brake. A converter like the # 119178 is exactly what you'd need. You can simply cut the plug off your existing 4 pole, and attach its yellow, green, brown...
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  • Troubleshooting Lights on 2006 Palomino Tent Trailer
  • Either a bad ground or an overloaded trailer wiring harness on your vehicle could cause the issue you describe. Without knowing anything about your vehicle or which harness you are using its tough to narrow down the source for the problem. It could also be a bad voltage regulator or alternator on the vehicle. If you are using a powered converter that gets its power for the trailer lights from a direct battery connection then the more likely explanation is the bad ground. If you are using...
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  • Recommended Trailer Wiring Kits For 2004 Saab 9-3
  • I have attached a link to our product page for the wiring kits we offer that are designed to fit your 2004 Saab 9-3. I recommend the Tow Ready Circuit Protected ModuLite Wiring Harness, part # 119179KIT. This kit comes with a circuit tester that helps locate the wires on your Saab you need to attach to. The unit prevents feedback to the electrical system on your vehicle. This system works with LED, incandescent, or standard bulb taillights. If you do not have a hitch installed on...
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  • Which Wire on a Trailer Brake Magnet is the Power and Which is Ground
  • Trailer brake magnets have two wires ran to them. Either can be used as the positive side as long as the other is grounded. To test your magnets you would want to apply 12 volts to one of the wires and ground the other wire. You should hear them grab the drum and start humming. For a replacement breakaway switch you could use the # 2005-P. For an 11 foot 7-way that you could wire your trailer to you would want the part # HM20048. You will need to attach the current wires of your trailer...
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  • Will Curt Upgraded Circuit Protected Wiring Harness # 56146KIT Fit 2015 Ford Escape
  • If you are looking for the most economical way to add trailer wiring to the 2015 Ford Escape that you are purchasing, you can use the Curt 3 Wire to 2 Wire Converter, # C56190. The Escape is going to require a heavy duty converter like the one in part # C56190 so we can not recommend reusing the wiring harness, # 56146KIT, from your 2012 Cadillac SRX. You may want to consider going with a plug-in option like the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118566....
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  • Troubleshooting Trailer Wiring Install Where all Circuits Are Active
  • If all of the circuits of your trailer harness are illuminating all of the time that would indicate that you did not wire up the harness correctly. It sounds like the problem is the taillight circuit you used for the harness. You would want to use the circuit that only sees voltage when the running lights are on and not one that is connected to the brake lights.
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  • Trailer Wiring Recommendation for a 2009 Audi Q7
  • If there is a round connector at the rear of your vehicle that looks like part # 37185 then you have the factory trailer wiring. Most likely you would know if you had it and the correct trailer wiring you would need would be the part # C56200KIT that you referenced. If you wanted to convert the 4-way to a 7-way you would only need the # 37185 that I mentioned earlier.
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  • 8 Ft Extension Needed for 7-Way on Trailer
  • If you are looking for an extension to run from the 7 way on your 2015 Nissan Frontier to the 7 way on your trailer, take a look at the TorkLift Wiring Harness Extension, # TLW6510. This measures 10 ft long, a bit longer than you requested, but will provide you will the connection needed. I have attached a short video to demonstrate how this will work. If you are looking to replace your trailer connector and need one with an 8 ft wire lead, you can use 7-Way Molded Trailer Wire Connector,...
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  • Recommended 4-Way To 5-Way Trailer Wiring Adapter For 2010 BMW X5
  • The fifth pin on the 5-Way connector on your trailer will typically be used on surge couplers that have an electric lockout feature. The pin that matches the trailer's fifth pin on the vehicle side will need to be connected to the reverse light circuit on your X5 for this feature to be active. I recommend using the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter, part # 20036. This adapter includes an additional wire that would attach to the reverse light circuit on the vehicle. I...
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  • Trailer Wiring Harness Recommendation for a 2004 Ford Crown Victoria
  • The recommended trailer wiring harness for your 2004 Ford Crown Victoria is the part # 46255 which takes all of the power to illuminate the trailer taillights from the battery of the vehicle. Because of this it would not damage the taillight circuits of your vehicle.
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  • Adding a 4-Way Flat Trailer Connector to a Harley with 5-Way Round Trailer Connector
  • The 5-Way on your Harley might actually have separate circuits each for brake lights, left turn signal, and right turn signal. A 4-Way will have the brake lights and turn signals on the same circuits. To tow a trailer that has combined wiring with a motorcycle that has separate wiring I recommend converting the Harley connector to match the other bike and the trailer. All you will need is a converter, # 119178. On the input side you will connect the wires from the bike's 5-Way. The red...
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  • Can 2 Gauge Wire be Used with Pollak Single-Pole, Round Pin Trailer Wiring Connector
  • A 2 gauge wire is only a little smaller than double aught (2/0) by about 0.11 inches diameter so it could be used in connector # PK11852. But I advise soldering in the wire and not crimping it for the best results. Triple aught (3/0) would be too large to fit.
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  • Installation Instructions for Tow Ready # 119190KIT Trailer Wiring Hanress- 2013 Volkswagen Tiguan
  • The Tow Ready # 119190KIT is not a vehicle specific item, so therefore there aren't any instructions that are specific to your vehicle. However, we do have an install video that will walk you through the install process. The installation is shown on a 2009 Tiguan, but the procedure would be similar on your 2013 model. To view the video, simply click the provided link. The kit does indeed include everything needed to complete the installation, including a circuit tester for probing the...
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  • Can Trailer Wiring Harness Power Wire be Attached to 12 Volt Power Outlet on a 2007 Audi A4 Avant
  • No, you can't use any other 12 volt power source other than the vehicle battery when installing a powered trailer wiring harness on your 2007 Audi A4. There are a few reasons for this. First, the harnesses are not tested with any other power source so you can run into warranty issues and possible unwanted performance from the wiring harness. Second, the power outlet circuit is fused separately so if something were to happen to that circuit you would suddenly have no trailer lights....
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  • 4-Way Trailer Wiring Harness has 5 Wires Coming Out of It on 2001 Pontiac Aztek
  • It would be very unusual for your vehicle to have a 5 way pin connector at the rear of your Aztec. It sounds like you have a wishbone harness. A wishbone harness has 5 wires and 4 pins like a regular 4-Way but where the wires come out the running light circuit is split so you do not have to run a jumper wire between tail lights. The wishbone harness will work with your trailer's 4 way connector.
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  • Troubleshooting Trailer Running Lights Circuit Not Functioning on Fifth Wheel
  • First thing you should do at this point is test the 7-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • 7-Way Trailer Connector Needed for 2015 Ford F-150
  • I recommend using the Hopikins Adapter 4- to 7-Pole and 4-Pole # 37185. This connector will work with the existing 4-way connector on your vehicle. Using this adapter, you will be able to tow trailers with 7-way connectors or 4-way connectors. There are a few additional parts we used when installing this connector. When connecting to your existing 4-way connector, dielectric grease # 11755 will help to protect the connection. We recommend securing this connection with a zip tie and...
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  • Trailer Wiring Harnesses for 2004 Toyota Solara and 2003 Mercedes-Benz C240 Wagon
  • We do offer a Tow Ready # 119178KIT that would be compatible with both vehicles, however it isn't a plug an play harness. None of our vendors offer a plug and play wiring option for either of your vehicles. The installation really isn't too difficult. You would need to access the rear of the taillight assemblies as if you were changing a burned out light bulb. The wiring harness kits include a circuit tester. You'd begin on the driver's side. Ground the tester to the vehicle body, and...
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  • 7-Way and 4-Way Recommendation for a 2007 Ford Expedition
  • The only 7-way/4-way we offer that would do what you are looking to do would be the # HM40975-11998 that has a connector that plugs into the back of the 7-way. The benefit to this style of connector is that it if you ever need to replace the 7-way you wouldn't have to rewire the whole thing and you could just replace the connector. If you have the round plug already all you would really need is the part # HM40975 though.
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  • Availability of 7-Way Blade Female to 7-Way Round Pin Female Trailer Connector Adapter
  • Although we don't carry an adapter like you describe, you could very easily construct one. I'd start with a molded 7-way blade trailer wire connector, which is available in the follwoing lengths: 3 foot- part # H20042 4 foot- part # H20043 6 foot- part # H20044 8 foot- part # H20046 11 foot- part # HM20048 On the other end, you'd simply wire in a female 7-way round pin connector, part # PK11700. I'll link you to our Trailer Wiring FAQ article that shows how a 7-way blade...
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  • Tow Package Running Light Circuit Stopped Working on a 2010 Nissan Frontier
  • Circuits that are tied to relays usually do have a fuse. There are 2 fuse panels for your 2010 Nissan Frontier. One is under the hood and the other is in the cab of the truck. Check both locations and if there are no blown fuses then it is likely a bad relay (tow package running light relay) and it will need to be replaced. It should be relay # 38666-1.
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  • Where Does an LED Tailgate Light Bar Wire Up on a 1997 Chevy C/K Series Truck
  • Those wires that you have found might be correct to use for a tailgate light bar but to be sure you would have to test them with a circuit tester such as # 3808. The easiest option would be to install a 4-Way trailer connector, # 118325, that will just plug in line with the main tail light wiring harness in the truck and provide a 4-Way flat trailer connector. I have included a link to a video showing how it installs.
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  • How to Make a 7-Way to 5-Way Adapter for Trailer with Separate Turn Signals
  • I can show you how to build an adapter for what you are trying to do, but there isn't one pre-made that we carry. You will need a trailer side 7-way like # 54-67-525, a signal converter # C56196, and a vehicle side 5-way # HM47900. Using the labels on the converter box you will need to wire the input side of it to the 7-way, and then wire the output side of it to the 5-way and you will have made an adapter to do what you are looking to do.
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  • Can Trailer Brake Output Circuit Wiring be Too Heavy
  • Having heavier than needed wire gauge on your trailer's brake output circuit would not cause your brakes to not function. The problem you described sounds like a short on the brake output circuit of your trailer wiring or bad grounds on the brake assemblies. But first check to make sure there is not corrosion on the trailer's 7-way connector pins as that would easily prevent the brakes from functioning. Inspect the wiring from the connector all the way back to the assemblies making sure...
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  • Running Lights Not Working With Reese Trailer Connector Adapter w/ LED Circuit Tester # 78118
  • Since you mention that the LED light on the Reese Trailer Connector Adapter, # 78118, isn't illuminating for the tail lights, it sounds like the issue is with the truck but this could be something as simple as dirt or corrosion in the 2013 Ford F-150's 7-way connector. If the pin looks clean then the issue may very likely be a blown fuse or faulty relay. If everything checks out to be fine and the running lights on your trailer still aren't functioning properly, please feel free to...
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  • All Trailer Lights Go Out when Brakes Applied and Running Lights On with a 1998 GMC Jimmy
  • This sounds like a short, overdraw situation, or a bad ground. The first thing I recommend is to check the vehicle and trailer side connectors and make sure they are clean and free of corrosion. On the trailer side check the wiring from front to back and fix any pinched or damaged wires. On the vehicle side you can test the functionality of the 4-Way using a circuit tester such as # 3808 and following the help article I have linked for you. If the trailer has a lot of running lights...
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  • Can Powered Taillight Wiring Harness Be Powered from Auxiliary 12V Outlet at Rear of Vehicle
  • You will want to run a separate 10-gauge wire for 12V power to your trailer wiring harness. The convenience outlet in your vehicle may not have enough current capacity to properly power the harness, plus the reason for using a powered converter in the first place is to protect your car's delicate wiring from damage due to shorts or overloads on the trailer. Its much cheaper and easier to replace a fried wiring harness than any of the wiring in your car. We've had reports from customers...
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  • Trailer Lights Only Work with Headlights Off on a Toyota Tundra
  • There are a couple of things that might be causing this problem. First, to isolate where the problem is you can first use a circuit tester such as # 3808 to test the vehicle side trailer connector without the trailer connected. Have someone sit in the cab of your Tundra and operate all the light functions with and without the headlights turned on while you test the trailer connector at the back of the truck. If everything is working fine when you perform these tests then the problem...
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  • 4-Way Trailer Wiring Recommendation for a Utility Trailer
  • A 5-way is usually seen on trailers that have either reverse lights or a reverse lockout for a surge brake system. If you have no need for a 5-way you could use a 4-way like the part # W787268. If you did want to install a 5-way you would want the part # A40W5B. A 4-way connector on a tow vehicle would still plug into a 5-way on a trailer. The fifth circuit just wouldn't be active. To make the install simpler and cleaner a junction box like part # 38656 would be a great option. Check...
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  • Recommended Methods to Test Brake Controller Output on Chevrolet Truck
  • You may be able to test the brake controller output on your truck's 7-way connector using a trailer emulator like Tow Ready # TR20117 when you are using an aftermarket Tekonsha or Draw-Tite brand brake controller. Since you have a Chevy factory integrated controller you can instead use a circuit tester like # 3808 or # 40376 to test the brake circuit pin on your 7-way. The linked photo shows the functions on each pin on a standard 7-way installation and the arrows indicate where to ground...
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  • Troubleshooting Trailer Running Light Wiring that Blinks when Brakes are Applied
  • Sounds like your trailer lights have a weak ground and the extra amperage draw of when the brakes are applied is causing them to flicker. We see this problem pretty frequently and the solution is to improve the grounds of the trailer lights. First, inspect the connectors on the trailer and the vehicle for corrosion and repair or replace as necessary. Next, check the ground connections on the trailer. A poor ground could cause the lights to malfunction. Be sure to check the main trailer...
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  • Parts Needed to Install Brake Controller on a 2004 Ford F-150 Heritage with 4-Way
  • The part # 37185 will convert your 4-way to a 7-way for the trailer light functions, but it would require a few more things to also function your trailer brakes. Instead of the # 37185 you would want the install harness part # 3035-P to install a Tekonsha brake controller and then the part # 118242 to convert the 4-way with a 7-way. You will also need a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling...
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  • Parts Needed to Convert 4-Pole Connector to 7-Way For Using Brake Controller on 2012 Honda Odyssey
  • With trailer wiring more wires allow more functions. Each wire on your current 4-pole flat trailer connector carries a lighting function. Stop and turn lights are carried on one wire for each side of the trailer (yellow for left and green for right) and the running lights are carried on the brown wire. The 4th wire, the white one, is ground and this ground connection must be solidly made to the vehicle's metalwork for any function to work properly. So this setup gives you 3 functions: stop,...
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  • Can a Jumper Ground Wire Be Ran from Right Side Tail Light to Left Side on 5th Wheel Trailer
  • Yes, you can run a jumper ground from one side of the trailer to the other. Make sure all grounds are connected to clean and corrosion free bare metal surfaces. The ground wire color can vary from light to light. If you can access the back of the light assembly it might say the functions of each of the wires. If it doesn't you can use a circuit tester such as # 3808 to test the wires. The one that doesn't have power would be the ground. Before you go through all of that trouble you might...
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  • Troubleshooting Trailer Taillights that Flicker and Turn Signals Don't Work
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • Trailer Wiring and Brake Controller Recommendation for a 2004 Nissan Pathfinder
  • You will need to start with a 4-way (if you do not have one). For that you would want the # 118361. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling...
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  • Can you Bypass a Shorted Out Converter Box Trailer Wiring Circuit
  • Sounds like your converter has shorted out. However, since the running light circuit signal does not need to be converted it can potentially bypass a converter box. Most likely a short on the trailer's wiring is responsible for the box shorting out so you would want to inspect the wiring of the trailer to find the short first. Look for any cut or exposed wire and fix as necessary. Also, if the converter you have has a wire that runs up to the positive terminal of the battery it is a...
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  • What are the Trailer Wiring Color Codes for Standard 4-way Wiring
  • Sounds like your trailer is using a wishbone style of 4-way connection that is running all of their ground (white wires), and running lights (brown wires), back to the 4-way connector. You could use a standard 4-way still but you would need to splice all of the ground and running lights together to wire them to something like the part # HM48110.
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  • Trailer Wiring Recommendation for a 2016 Kia Sorento
  • For trailer wiring for a 2016 Kia Sorento without a tow package you would want the trailer wiring harness part # 56146KIT. This is universal wiring kit that will work great for you. I attached an install video for you to check out as well.
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  • Recommended Wire Harness For 2012 Toyota Prius Plug-In Hybrid
  • The wire harness we have that is designed to fit your Prius Plug-In Hybrid is part # 119147KIT. This is a hardwire installation, and really is not a real difficult install. You can check out the link to the installation video I have attached. We do not offer a T-One harness for the Hybrid Plug-In.
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  • Troubleshooting Running Lights That Go Out When Brake Lights Are Activated
  • It sounds like you may have a weak ground connection on your vehicle's trailer wiring harness. A bad ground can cause all sorts of odd effects, including having one light function go out when another is activated. A weak ground will pass enough current for some functions to work, but possibly not for others. Check that the wiring harness ground wire's ring terminal is tightly attached at a clean bare metal surface on the vehicle. You may want to clean/sand that spot to ensure metal-to-metal...
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  • Troubleshooting 7 Way to 4 Pole Adapter for 2008 Mercedes-Benz GL450
  • You will need TowReady part # TR20141. This adapter is recommended with most German vehicles, especially if you are pulling a trailer with LED lights. This adapter will plug into your factor 7 way on your tow vehicle and allow you to plug in back here either a 4 way or a 5 way connector on a trailer. The adapter has built in load resistors that create more draw.
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  • Adapter Availability to Allow Both Trailer Sockets on 2012 F-350 to Be Used at One Time
  • If your truck connector looks like Hopkins # HM40975 where the two socket covers back up to one another then your options are to remove one of the covers, to use a hardwire replacement socket like # HM48470 which allows both to be used at once, or to install a 5th wheel inline plug-in wiring harness like # 51-97-410 at the back of your existing 7-way. This would let you use the existing socket for your trailer's 5-pole and provide a 7-way for your camper connection. Unfortunately there...
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  • Driver Side Trailer Wheel Makes Noise when Connected to Truck
  • The noise you mentioned sounds like it could be the brake magnets. The magnets making noise makes me think there is a bit of a short. To determine where it is coming from the first step is to disconnect the trailer. You can then start troubleshooting starting with the brake controller. In the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # 3808 to test the end of the blue wire coming out of the controller....
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  • 7-Way Recommendation for a 2013 Ford Explorer to Replace 5-Way
  • A 5-way round connector like the part # PK11501 is a fairly uncommon trailer connector. I would recommend you remove that connector and replace it with a 7-way to match your trailer since that is a very popular trailer connector. For that I would recommend the part # 50-87-002. You will want to use a circuit tester like part # 3808 to test the wires to determine their function and then wire them accordingly to the 7-way.
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  • What Circuit Does Trailer License Plate Light Tap Into
  • The license plate light of a trailer will need to tap into the running light circuit of your trailer wiring. The white wire of the light will be the ground and would need to get ran to the frame of the trailer and the black wire will be the power wire for the light and would get ran to the running light circuit. Typically the brown wire of trailer wiring is the running light circuit. This will be the pin closest to the jacketed pin on the 4-way (the ground). I attached a help article...
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  • Will Camper Fridge Drawing Power from Hybrid Battery Damage the Battery on a 2007 Toyota Highlander
  • If the 12 volt circuit on the 7-Way is connected to the main hybrid battery that powers the drive wheels on your 2007 Toyota Highlander then you would need to be careful about how much power items are pulling from it. Things with low power draw such as LED lights are not going to be an issue. But a refrigerator compressor can use a lot of amperage and that could potentially be harmful to a hybrid battery. What I recommend is to have the 12 volt circuit from the 7-Way just go to the trailer...
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  • Running Lights on 2 Trailers Not Working with a 2005 Dodge Ram 1500
  • When you checked the fuse on the truck did you check the truck's running light fuse or the tow package running light fuse? They are independent of each other on most vehicles. There also could be relays associated with the tow package wiring that you can check. A good start was to clean the trailer connector but if there is no power on the running light circuit then the issue is further forward somewhere on the truck. And if it is not a fuse or relay then it is likely a damaged wire...
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  • Troubleshooting No Running Lights on Camper
  • The first thing you are going to want to do is use a circuit tester like # 3808 if needed and test the connector on your truck to make sure all of the functions are working. If they are not use the owners manual and/or the legend on the power distribution box lid to find the locations of any fuses or relays related to the tow package wiring and replace any that are faulty. Next test the adapter. This will tell you if there is a problem in the connector. If the problem is on the trailer,...
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  • Trailer Lights Do Not Work with 1998 Ford Explorer or 2007 Ford F-150 but Do Work w/Other Vehicles
  • There isn't anything unusual about the 1998 Ford Explorer or the 2007 Ford F-150 that would cause the right side trailer lights to not work. there are some things you can check though to determine if the issue is indeed on the vehicles or on the trailer. First though it is possible for a trailer to work fine with one vehicle but not another even if there is no problem on the vehicle or trailer. What can happen is if there is a dirty or corroded trailer connector, some tow package wiring...
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  • Troubleshooting Trailer Turn Signals on 7-Way Both Having 12 Volts at all Times
  • The stoplight and blinkers circuits should not have 12 volts of power on them at all times. Typically when what you described happens it's because the 12 volt power circuit is shorting out to those circuits. If you paid someone recently to install the 7-way I would take the vehicle back and have them fix it. Another possibility is that the trailer wiring converter box that was used for the taillight circuits has shorted out due to a short on the trailer wiring. What you will want...
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  • 7-Way and Brake Controller Install Recommendation for a 2011 Ford F-350
  • A 7-way for trailer wiring will have the blinker and stoplights on the same circuit. I attached a picture that has a diagram that shows all of the circuits that a 7-way has. To install a brake controller like the part # 90885 in the truck you will need the correct install harness, part # 3034-P. If the vehicle had a 7-way from the factory that is all you would need to install the controller. If instead the vehicle had a factory 4-way you would need to then make a few connections under...
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  • Running Light Pin and Wire Not Working on 2001 Dodge Ram 1500 Factory 7-Way
  • It is possible that there is more than one fuse or possibly a relay related to the tow package running light circuit. Use the owner's manual and/or the legends on the in-cab and under the hood fuse panels to find all locations of fuses/relays related to the tow package wiring. I tried to find a copy online but was unsuccessful. There could also be a problem on the wiring somewhere between the connector and where it terminates further forward on the truck. Look for damaged or pinched...
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  • Power is Getting to Electric Trailer Brakes but the Brakes are Not Working
  • It sounds like there is a problem with the brake magnets on the trailer. Inspect the power wires to the magnets and look for pinched, frayed, or damaged wires and fix as needed. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces. You can visually inspect the magnets and if you can see the copper windings coming through the magnets will need to be replaced. To further test the magnets you can follow the help article I have linked. I have also included...
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  • Availability of 24-Inch 7-Way Blade Style Trailer Wiring Extension
  • We have several lengths of 7-way blade style wiring extensions, including a 24-inch from TorkLift, part # TLW6024. This and other similar wiring extensions can be seen by clicking on the linked page. If you'd rather fabricate your own extension harness to save some money you can use parts # H20046 and # PK12707. Note that these parts' wire colors by function are different from each other so be sure to match the FUNCTION, not the wire colors. Each one's wire functions are listed on...
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  • How to Wire Up an Adapter to Tow Trailer for Motorcycle that has a 5-Way
  • Normally, the 5 wire flat connector will accept a 4 wire flat connector and work properly. The extra circuit on the 5 wire connector is normally wired to power a reverse lockout or electric trailer brakes not the brake lights. If your motorcycle has the brake light circuit connected to the extra circuit you will need to do some re wiring or install a converter, item # 119178KIT, on the motorcycle. Your trailer should be wired as follows. White wire = ground, brown = tail light, yellow...
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  • Troubleshooting Malfunctioning Right Brake Lamp on Trailer Towed by 2005 GMC Yukon
  • Since the right turn and brake lamp signal are carried on the same circuit, the problem is most likely in the vehicle wiring. Begin by using a circuit tester like # 40376 on the right turn/brake lamp pin in the 3:00 position on the 7-way. You should get signal on that pin when the brake pedal is pressed. If you don't, access the wiring harness behind the 7-way, and look for the green wire in the wire loom. Use the tester while the brake pedal's being pressed. If you see signal on the wire,...
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  • 7 Wire to 4 Wire Round Adapter Needed
  • I have attached a picture for you. If you need connectors like those in the picture then you can use the Hopkins Endurance Flex-Coil Trailer Connector Adapter with Nite-Glow, # HM47043. This adapter is designed for use when flat towing, 7-wire blade-style vehicle end connector and 4-wire round towed vehicle connector. If you have a different style of connector, please send me a picture and I will be happy to find a product that will work for you.
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  • Recommended Parts for Installation of Trailer Brake Controller in 2007 Toyota Highlander
  • Your 2007 Toyota Highlander is not one of the trucks for which a brake controller connection port is provided under the dash. This just means your brake controller installation will be hardwired and require use of our brake controller installation kit # ETBC7. This handy kit includes the 7-way, connectors, wiring, circuit breakers - everything you need to install a brake controller like the outstanding Prodigy P2 # 90885. Installing the ETBC7 kit is not difficult and you can see the...
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  • Should Trailer Wiring Have the Running Light Circuit Always Activated
  • The only time the running light circuit of trailer wiring should be on is when the headlights or running lights of the vehicle are on. You might have a shorted trailer wiring converter box or a bad relay if the trailer wiring is factory. I attached a help article on troubleshooting trailer wiring installs for you to check out as well.
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  • Fifth Wheel Trailer Wiring Recommendation for a 2015 Chevy Silverado 3500
  • For fifth wheel wiring for the bed of your truck you would want the part # 50-97-410 since it will plug inline with your current 7-way and won't require cutting and splicing like the part # 51-97-407 that you also referenced.
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