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Expert Answers about Wiring


  • 7-Way and 5-Way Connector Recommendation
  • The closest thing we offer to what you are looking for is the part # HM48470. This will require you to remove your current 7-way and wire this one in it's place. Once installed it will provide you with a 7-way and a 5-way that can be used. Check out the videos I attached as well. Once shows a review video and the other an install video.
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  • Troubleshooting 12 Volt Accessory Circuit Not Functioning After 6-Way Connector Install
  • It is possible that you shorted out the 12 volt trailer wiring circuit of your truck while you were wiring in the connector. Since this circuit would have voltage all the time it would be pretty easy to short it out while wiring up a new connector. Check the fuse box for the 12 volt accessory trailer circuit relay/fuse and replace as needed.
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  • Troubleshooting a Vehicle that Trailer Wiring Stopped Working After Installing LED Taillights
  • The converter box of your wiring harness is looking for the amount of amperage on the circuits that is associated with incandescent bulbs. Since you switch to LEDs that draw considerably less the trailer wiring isn't functioning. You can either go back to your incandescent bulbs to fix the problem or you can install a different taillight harness like part # 119190KIT that is designed to work with LED taillights.
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  • Troubleshooting Trailer Running Lights Not Working on a Trailer
  • 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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  • 7-way Round to 7-Way flat Adapter Recommendation
  • For a 7-way round to 7-way flat adapter you would want the part # PK12-724. For a 7-way extension that would give you 7 feet of extension you would want the part # C56080. If by chance your tractor has separate taillight wiring, meaning that the turn signals and brake lights run on separate pins, you will need to add a converter, like the Tow Ready, # 119130. Just cut off the 4 way end and wire it into this adapter. I have attached a picture which illustrates this. In order to...
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  • 7-Way Trailer Connector 12 Volt Circuit has Power All the Time
  • The 12 volt circuit on a 7-Way that was hardwired into a vehicle is going to have power all the time. Provided nothing is plugged into the 7-Way that draws power from the 12 volt circuit then it would not be a problem. The little LED light would take months to drain a vehicle battery if you were to let it sit all that time and never start the vehicle. But there is a way that you can shut off power to the 12 volt circuit when the vehicle is off. You would need battery isolation solenoid...
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  • Troubleshooting Trailer Lights That Go Off When 2011 Dodge Ram Is Put in Reverse
  • It sounds like the wiring on your trailer 7-way connector is wired incorrectly. Try using a circuit tester like part # 3808 and testing each pin on the trailer connector for function. If the pins on the connector are compared to the hands of the clock, the pin at the 1:00 position is the 12-volt accessory feed. This pin should show constant voltage. The pin in the 3:00 position should show voltage when the right turn signal and brake is activated. The pin in the 5:00 position carries the...
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  • Troubleshooting 2003 Chevy Tahoe that 7-Way Stopped Functioning
  • If the trailer wiring fuses of your 2003 Chevy Tahoe are good and the 7-way still isn't working properly the problem is either that there is corrosion on the 7-way that would need to be cleaned off with fine grit sandpaper or the wiring to the connector itself is damaged somewhere between the connector and the vehicle fuse block. Check out the connector, most likely you will either find damaged wires behind the connector or corrosion that needs to be fixed or there is corrosion on the...
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  • Can Unused Red Wire on Curt Trailer Wiring Harness Just be Cut Off
  • On certain applications, the red wire on Curt trailer wiring harness # 56146KIT does have to be grounded with the white wire since it isn't used in all applications. But you wouldn't want to cut it because that could potentially void its warranty. Since it is an input wire you are correct that it would not be hot (unless there was some sort of catastrophic short inside the converter box).
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  • How to Test Brake Switch to Find Circuit to Use for Brake Controller Installation
  • The easiest and most reliable way to determine which wire of your brake switch wire is the correct one to use is to use a circuit tester like part # 3808 to test all of the wires for voltage when the brakes are applied and none when released. It sounds like you are wiring up a brake controller so I attached a help article on brake controller hardwiring for you to check out as well.
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  • 7 way Round to 4 Way Flat Adapter Recommendation
  • The 7-way round style of connector that the # 47405 has is the same style that is typically found on tractor trailer type rigs. The issue you may run into is that the taillight circuits of your tractor are separate, meaning that the brake lights and the stop lights are carried on separate circuits. If that is the case just the # 47405 wouldn't work. If this is the case you will want the converter part # 119130 and a male round 7-way part # PK11700.
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  • Troubleshooting Trailer Running Lights Not Functioning After Boat Launch
  • Water and electricity don't mix well so I would imagine the issue you are having with the running lights of your trailer are related to your trailer being submerged in water when you launched your boat. 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. I suspect a blown fuse on the tow vehicle is to blame...
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  • What are the Functions of a 5-Way Flat Trailer Connector with 6 Wires
  • It sounds like you have what is called a wishbone harness like # A40W5B as an example. This type of harness will have 2 wires that share the running light circuit. This is so you can use two wires, one for each side of the trailer, for running light functions so you don't have to run a jumper wire from one side of the trailer to the other. The brown/yellow would be the left side and the brown/green would be the right side. Usually the green only is right turn signal/brake lights, yellow...
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  • Troubleshooting 7-Way Trailer Connector on 2003 Chevy Tahoe
  • Check that the harness that plugs into the rear of the trailer connector is pushed in all the way. I'd recommend using a circuit tester like part # 40376 on the wiring behind the trailer connector. If you're getting power on the harness but not on the trailer connector, the connector is faulty, damaged or corroded and would need to be replaced with a new connector such as part # HM40975. If you don't see any power on the harness, you'll need to check the fuse box under the hood. The...
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  • Heavy Gauge Trailer 4-Way Wiring, 16 Gauge
  • The longest 4-way harness we offer that has all 16 gauge wire is the Wesbar Harness part # W787274 which is 14 feet long. For one that is 30 feet long that has a 16 gauge ground wire and 18 gauge signal wires you would want the part # W002230.
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  • 2 Pole Wiring Connector Recommendations for Powering Winch on Trailer
  • That would be a great idea. We don't carry 4 gauge wire, but the # PK12801 2-pole connector would work great for what you are trying to do. For the male connector you would want the part # PK12800. The connectors are rated for up to 200 amps so you will need to make sure your winch doesn't draw more than that.
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  • Trailer Brakes Activate Every Time Turn Signal is Used
  • It sounds like you wired the brakes into the combined stop/turn signal circuit on the trailer. Trailers use what is called a combined system meaning that the brake lights and turn signals are on the same tire. So when you are using the turn signal the wire is energized and will apply the trailer brakes when the light blinks. To use the electrical trailer brakes you have to have a dedicated wire just for the brakes and you must use a brake controller in the tow vehicle. The most common...
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  • Can a Trailer Battery Be Charged through 12 Volt Circuit on Hopkins Coiled 7-Way to 6-Way Adapter
  • Trailer wiring on a vehicle or trailer can provide a maintenance charge only to a 12 volt battery (if it is a regular car type of battery) but the wiring is not heavy enough, nor are most vehicle alternators strong enough, to push back the amperage required to charge up a 12 volt battery. If it is a small breakaway battery then it can charge it up. So as long as the 12 volt circuit is working on the tow vehicle and the matching 12 volt circuit on the trailer side is connected to the...
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  • Recommended Trailer Wiring Harness for 1998 Holiday Rambler
  • Your 1998 Holiday Rambler shouldn't require a special converter but if the installation was completed per the instructions and this is the second unpowered converter that you have tried, I recommend trying a powered converter with circuit protection like the Tow Ready, # 119190KIT. With a powered converter the power is drawn directly from the vehicle's battery which virtually eliminates any draw on the taillight circuit.
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  • Will the Tow Ready 7-Way to 5-Way and 4-Way Trailer Adapter Work with a 2006 Volkswagen Touareg
  • The Tow Ready 7-way to 5-way and 4-way trailer adapter # TR20141 you referenced isn't recommended for the 2006 VW Touareg because it's the first generation, but I do have another option for you. Volkswagen made changes to the tow package starting in 2007 that requires specialized adapters. A comparable adapter would be the Optronics 7-pole to 5-pole flat # A75TB that would work for you. Another adapter that I recommend is the Hopkins multi-tow trailer connector adapter 7-way to 6-way,...
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  • How to Power Trailer Dome Light When Not Connected to Tow Vehicle
  • The only way you could power interior dome lights on a trailer without it being connected to a tow vehicle would be to power the lights with a battery like a breakaway battery. How you choose to wire up the batteries will in the end be up to you, but since breakaway batteries need to be charged up when you are towing I would be careful not to drain the battery with the dome light.
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  • How to Tow a Trailer with a 5-Way Round Connector with a Bike With a 4-Way Flat
  • Why is an interesting question for your situation. But most likely I would say the reason would be so that you could tow the trailer with your motorcycle? Since 4-way flat connectors are much more popular than 5-way rounds I would recommend you remove the 5-way and install a 4-way flat to match the one on your bike. For a 4-way you would want the part # 18004. Now since most likely your trailer has separate turn signals from the brake light you will need to use a taillight converter...
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  • Trailer Wiring Harness Recommendation for a 2002 Mercedes Benz M-Class
  • The Curt Wiring Harness part # 56146KIT that you referenced is a universal fit wiring kit designed to fit your 2002 Mercedes M-Class as well as the VW in the product picture. I attached an install video that shows this wiring kit being installed on a very similar M-Class as yours for you to check out as well.
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  • 7- and 4-Way Trailer Connector for a 2012 GMC Sierra 2500
  • Yes, Curt 7- and 4-Way # C57101 will plug into the same harness as the factory 7-Way on your 2012 GMC Sierra 2500 (though it will not fit in the same place). For a 7- and 4-Way without backup alarm you could use # 20119, # 30955, or # HM40975.
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  • Availability of Protective Cover for Wesbar # W787274 Trailer End 4-Pole Connector
  • We have exactly what you're looking for, part # W787301 which is compatible with the Wesbar # W787274 you mentioned.
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  • Availability of Trailer Wiring Harness for 2013 BMW X6
  • According to Tow Ready the # 119190KIT which was a fit for the 2013 BMW X5 would be compatible with your 2013 X6. I've confirmed this with my contact at Tow Ready. I've linked you to an install video showing the wiring harness being installed on a 2013 BMW X5. The procedure for your X6 would be similar. To complete your towing set-up, you might need the following: Ball mount, part # 2923 1-7/8 inch trailer ball, part # 19260 2 inch trailer ball, part # 63845 (The coupler on your...
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  • Troubleshooting Brakes of Logan 3 Horse Trailer Towed by 2015 Silverado 3500 w/ OEM Brake Controller
  • Good thinking testing the truck with your other trailer, you've ruled out the truck as being the cause of the problem. Since all the trailer lights are functioning on the trailer, the problem is likely in the braking system. Start with the trailer plug, and closely examine it for damage or corrosion. If it's damaged or corroded, you can replace it with a connector like part # H20044 for a 6 foot long wire or # H20046 for an 8 foot long wire. Trace the brake output circuit back to...
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  • Converting From 7-Way Round to 7-Way Flat Connector
  • We do offer the Pollak Trailer Connector Adapter, # PK12-724, which converts a 7-pole round connector to a 7-pole flat connector. This adapter works for tow vehicles with combined taillight wiring, meaning that the turn signals and brake lights run on the same pin. If by chance your tractor has separate taillight wiring, meaning that the turn signals and brake lights run on separate pins, you will need to add a converter, like the Tow Ready, # 119130. Just cut off the 4 way end and wire...
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  • Instructions to Wire a Trailer for Electric Brakes
  • It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean metal surface on the trailer. I have included a diagram for you.
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  • 4-Way Mounting Bracket Recommendation for the Hopkins Endurance 4-Way # HM48190
  • The # HM48190 is a pretty large connector that most traditional brackets won't quite fit into, but you could use the magnetic bracket part # 38095. You would just use the bracket to grab just the wires before the 4-way and it would be secured.
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  • Recommended 7-Way Trailer Wiring Harness For 2004 Porsche Cayenne
  • On your 2004 Porsche Cayenne the connector that would work best would depend on the setup you currently have. If you need the 7-way connector due to the trailer connector and if the trailer has brakes there are a couple of items you will need. If you have a 7-way connector on your Cayenne and need to replace it the Hopkins Endurance Multi-Tow 7-Way RV and 4-Way Flat Trailer Connector, part # HM40950 would work fine for you. If you have no 4-way connector at the back of your Cayenne...
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  • Installing 15-Amp Power Inlet On 2003 Arctic Trailer
  • The cord on your trailer may be rated for 30 amps. You may be able to find out what the rating is for the trailer by checking your breaker panel or in the paperwork for your trailer. The # 14149 is rated for 15 amps and can be used with any standard 15 amp extension cord. The inlet has a 3-prong male end inside the housing. If you find that your camper is 30 amps the Arcon RV Power Cord Adapter w/ Folding Handle, part # AR14362 is what you will need. I have attached a photo of the #...
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  • Can 50 Amp Surge Protector Be Used On 30 Amp Service In RV
  • You can use a 50 amp surge protector on your 30 amp service but I would offer a bit of caution. If any of your appliances or items are rated at 30 amps and something happened that caused them to draw more power, the 50 amp surge protector would not trigger and you could suffer damage to those items. If you decide to use the 50 amp surge protector I recommend making sure everything is in good working order, but as I stated, if there were a problem it may cause damage because the circuit...
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  • Recommended Adapter To Convert 4-Way To 4-Way And 7-Way Plug On 2002 Toyota Tundra
  • The Pollak 7-Pole and 4-Pole Trailer Connector, part # HM40975-11998 will work with your 2002 Toyota Tundra but since you said you already have a 4-way connector I may have a better solution for you. I recommend the Hopkins Adapter, part # 37185. This adapter plugs into the 4-way at the back of your Tundra, and with additional wiring gives you a 7-way connector. I have attached a link to an installation video for this adapter on a Tundra you can check out. When working with electrical...
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  • Trailer Wiring Recommendation for a 2014 Hyundai Elantra Sedan
  • Sorry to hear about the bad luck you had with the Curt Harnesses on your 2014 Hyundai Elantra. Tow Ready has confirmed the # 119190KIT as a fit for your vehicle so it would be your best option. We tend to have better luck with the Tow Ready wiring harnesses. I attached install instructions and an install video that shows this harness getting installed on a similar vehicle for you to check out as well.
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  • Troubleshooting Trailer Brakes that Dont Apply
  • I am glad you were able to figure out the issue with the circuits being swapped. That is a pretty common issue with the 6-way wiring setups. 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...
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  • Troubleshooting Trailer Wiring on a 2013 Kia Soul that Lights Up Trailer Lights All the Time
  • It sounds like there was a short on your trailer that developed over the winter and when you connected your Kia Soul to it the short took out the converter box of the # 118637. If you want you can test to verify this, but I am very confident the box has shorted out and needs to be replaced. What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight...
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  • Recommendation for Allowing Mercedes to Tow a Trailer with LEDs without Bulb Out Warning
  • I have a solution for you, but as far as a simple adapter like the part # 20142 that would plug into your 7-way round there isn't an option available. Instead you would need to install load resistors on all of the taillight circuits of your trailer that have LEDs. For a pair you would want the part # P230004C-2.
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  • Troubleshooting a Blown Fuse Every Time a Trailer is Connected
  • If your taillights keep blowing every time you connect your trailer, it seems to me you have a short in the running light on your trailer. I recommend starting at the trailer connector and check for any corrosion or damaged pins. If there is corrosion, remove the wires from the connector as it could have spread inside the connector. Also, check the vehicle side connector for any corrosion or damaged pins. Fix as needed. If the connectors are clean, follow the running light wire looking...
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  • Do Hopkins Trailer Wiring Adapters # HM47083 and # 47549 Do the Same Thing
  • Both of the Hopkins wiring adapters you referenced, parts # HM47083 and # 47549, will plug into a vehicle side 7-way socket and convert that connector format to a 6-way round-pin type. The main difference is that part # HM47083 includes a coiled cable that is 3-feet long when stretched fully while the # 47549 is just the adapter portion without the extension cable. Another difference is pin configuration. Usually 6-way connectors use the center pin for the trailer's 12V power feed. This...
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  • Could Trailer Interior Lights Be Powered Off of the Running Lights Circuit
  • If you were to hook up the interior lights of a trailer to the running lights circuit of the trailer wiring they would only have power when the headlights or running lights of the trailer wiring are active. Also you would not want to exceed the amperage capacity of the running light circuit with the amperage draw of the interior lights.
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  • Troubleshooting Dim Trailer Running Lights
  • 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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  • What Does the Camco RV Power Defender Voltage Monitor # CAM55301 Plug Into
  • The female end of the Camco RV Power Defender Voltage Monitor # CAM55301 that you referenced plugs into the RV's 30 amp power plug and the male side plugs into a 30 amp receptacle. I attached a review video for more info for you to check out as well.
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  • Can Electric Drum Brakes be Added to a Utility Trailer
  • It can be possible to add electric drum brakes to an existing trailer that does not have them. The linked article explains in detail. The trailer will need to have or be fitted with brake flanges, the brake assemblies and hub/drums of matching dimensions and trailer wiring to support the brake circuit. The tow vehicle will have to be equipped with a trailer brake controller and a suitable trailer socket to match the one on the trailer. Typically trailers with brakes use a 7-way RV-style...
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  • What is the Length of the Arcon Replacement RV Power Cord Plug # AR19186
  • I went out to the warehouse and pulled Arcon Replacement RV Power Cord Plug # AR19186 to measure it for you. With the handle in the upright position it measures 4-7/8 inches tall overall. With the handle down it is 4-1/4 inches tall. When plugged in it measures 2-5/8 inches from the face of the outlet to the end of the handle if the handle was sticking straight out, perpendicular to the wall. It is 1-1/2 inches with the handle in the upright position.
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  • Should 12 Volt Circuit be the Center Pin or 1 Oclock Pin in a Vehicle Side 7-Way Trailer Connector
  • I would stick with the standard 12 volt circuit at the 1:00 position rather than use the center pin, which is normally used for reverse lights. Please note that the 12 volt circuit on a trailer connector, no matter which pin it is associated with, will not be able to charge up a 12 volt vehicle battery (if that was your plan). It can only maintain the charge level of the battery. So if you had something using power from the Toad battery while flat towing it then the drain would be greater...
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  • Function of Center Pin on a 7-Way RV Blade Style Trailer Connector on a 2003 Toyota 4Runner
  • No problem, I will be happy to help. The 7-Way you have is called a blade or RV style. The center pin will either be for reverse lights or auxiliary 12 volt power. If the trailer does not have reverse lights or does not need a second 12 volt circuit then it would not matter if the adapter had it or not. If the trailer has an electric reverse lockout feature, common on boat trailers with surge brakes, then you would need that center pin in the adapter and the center pole on the vehicle...
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  • What Wire Gauges Are Used in WesBarg 7-Way RV-Style Connector # WG54006-046
  • The WesBarg 7-Way RV-Style Connector # WG54006-046 uses several gauges of wire depending on their function. Black and white wires, which provide 12V power and ground respectively, are 10-gauge. The blue wire, typically for a trailer brake circuit, is 12-gauge. All other wires for the lighting functions are 14-gauge. These lighting wires are lighter gauge because they will need to handle less power. Installation of a harness like this on your trailer will be easier with a junction...
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  • Wiring 1994 Dodge Dakota SLT V8 for Towing Coleman Mesa Trailer with Electric Brakes
  • We've got just what you need to ready your Dakota for towing your Coleman Mesa pop-up camper. Since you already have a working 4-pole wiring harness installed you'll just need to select a brake controller and an installation kit to convert your 4-pole to the required 7-way. For a brake controller its easy to recommend the popular and reliable Tekonsha Prodigy P2, part # 90885. Yes, there are less costly units available, but the P2 offers excellent user-friendly features like built-in...
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  • 7-Way to 7-Way Bulb Out Sensor Bypass Adapter for a 2006 Volkswagen Touareg
  • Even without that mounting block at the top of adapter # C57003 it still may not fit directly in place of the old 7-Way. This adapter is meant to plug into the existing 7-Way, leaving it in place, and then you would mount the other end to a nearby location. If your 2006 Volkswagen Touareg has a factory 7-Way and you want a more inconspicuous adapter you can use # 20142 which would be less invasive than # C57003.
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  • Trailer Wiring Harness for a 2013 Mercedes GLK350
  • For 2013 there were 8 versions of the Mercedes GLK. Diesel motors were available on the 200, 220, 250, and 350. Trailer wiring harness # 119190KIT is a universal type of item though and should work just fine on your 2013 GLK350 even though it is not officially listed as a fit.
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  • How Does a Vehicle 7-Way Wire to a Truck
  • Since vehicle wiring colors can vary by vehicle the best way to wire up a 7-way like the part # PK12703 that you referenced is by function. You may need a circuit tester like part # 3808 to test the wires of your vehicle to determine the functions before you wire them according to the diagram I attached.
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  • Recommended Wiring and Installation Instructions for Winch
  • Single-Pole, Round Pin Trailer Wiring Connector, # PK11852, which you reference, uses #OO gauge wire, which we do not carry at this time. The best solution would be to use a winch wiring kit like the Winch Trailer Wiring Kit, for up to 4K Winches, item # SW1520. This kit includes everything needed to install a connector at the rear of the vehicle and at the front of the trailer, for powering a winch. If you already have heavy enough gauge wire you can order the Electrical Quick Connectors,...
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  • How to Wire a 6-Way Trailer Connector to a Chevy Astro Van
  • I really need to know the year of your Chevy Astro to determine the best way to install the trailer connector to the van's wiring. The Astro was produced from 1985 to 2005 so that is a big range. I can tell you that the likely functions of the wires are red for brake lights, black for 12 volt power, white for ground, brown for running lights, yellow for left turn signal, and green for right turn signal. But I cannot be sure of that either. I have included a link that has diagrams...
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  • Trailer Connector Adapter fore 2010 Nissan Frontier
  • Which trailer connector does the Frontier currently have, a 4-pole or a 7-way? Which connector does your trailer use? If you have the factory 4 pole on the truck and need to convert it to the 7-way, you can do so by installing part # 118267. If your trailer has electric brakes, and you'd like them to actuate you would need to install a brake controller like the Tekonsha Prodigy P2 part # 90885 and the brake controller wiring adapter, part # 3050-P which would plug in under the dash near...
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  • Recommended 4-Pole to 7-Pole and 4-Pole Adapter For 2014 Jeep Wrangler
  • The easiest way to wire your 2014 Jeep Wrangler is to install part # 37185. This will plug into your 4-way connector on your Wrangler and after running an additional wire from the battery will give you a 7-way plug for your trailer and also a 4-way plug at the rear of your Jeep. To run the hot wire from your battery to the # 37185 you will need additional wire like part # 10-1-1. This is jacketed 10 gauge wire that is sold by the foot. I also recommend an in-line circuit breaker...
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  • Trailer Wiring Harness Recommendation for a 2014 BMW X3
  • I have a trailer wiring harness that will work for your 2014 BMW X3, but according to Curt, the Upgraded Circuit Protected Tail Light Wiring Harness, # 56146KIT, has not been tested on the 2014 model yet. The harness that I recommend is the Tow Ready Heavy-Duty Modulite Wiring Harness, # 119190KIT. I spoke with my contact at Tow Ready and he confirmed that this harness will work. We have installed this harness on a 2013 BMW X3, so I attached the installation video. The installation...
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  • All Trailer Lights Flash When Using Turn Signals and Running Lights
  • There could be a few potential problems here. Since the lights work as they should until the running lights come on, then the issue is most likely on the trailer. Problems like this are typically associated to a poor ground connection. To make sure the problem is isolated to the trailer, I recommend using a simple light tester, like part # 40376, to test the trailer connector on your tow vehicle to make sure it is functioning properly. I have attached a video that shows how to do this....
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  • Trailer Wiring Recommendation for a 2012 Acura TSX
  • For the Sport Wagon versions of the 2012 Acura TSX there are only splice-in trailer wiring options at this time like the part # 119179KIT. I attached an install video for you to check out as well.
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  • Does Hopkins Adapter 7-Pole to 4-Pole and 5-Pole Fit 2006 Toyota Tundra
  • As long as your 2006 Toyota Tundra has a 7-way connection you can plug in the Hopkins adapter # 37385, which you reference, to get a 4 or 5-way connector. You will want to make sure your trailer has a four way (male) connector as well. This adapter will convert your 7-way trailer connector to a 4 or 5-way connector to match your trailer. I have included a video review of this adapter for you to check out.
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  • Recommended Wiring Harness for 2016 Mazda CX-5 with LED Lights
  • The Curt Trailer Wiring Harness you referenced, part # C56175, is not recommended for use with vehicles that have LED lights. However, I can offer you an easy solution that will not require any cutting of wires. TowReady T-One 4-Pole Trailer Wiring Harness # 118400 is a plug-and-play harness that simply plugs inline to your tail light assemblies without the need to cut or splice wires. My contact at TowReady confirmed this harness works both with vehicles and/or trailers that use LED-type...
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  • Troubleshooting Low Taillight Circuit on Trailer Taillight Converter
  • What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself out and would need to be replaced. Before you replace it you will want to inspect the...
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  • Which Fuse Provides 12-Volts to 7-Way Connector on 2009 Chevy Silverado 3500 Diesel
  • If the 12-volt pin on your trailer connector isn't working, you've got a missing or blown fuse or the wiring connection at the fuse box under the hood wasn't finalized. You're looking for a 40 amp fuse, located in position # 68 in the fuse box under the hood. The fuse protects one of the nearby power studs on the side of the fuse box, which is where the wire that provides power to the 7-way should be connected. If it's not, you can find the wire bundled up under the master cylinder...
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  • Troubleshooting Humming Brakes when Hazard Lights Flashing On 1996 Chevy C1500
  • A pulse preventer, part # 5501, should stop this problem. The flashers are sending feedback into the brake controller and pulsing it. Find the spot where the brake controller is spliced into the wire from the cold side of the stoplight switch. This is typically the red wire on the brake controller. Then just past this (away from brake controller) cut the vehicle stoplight wire and install the Pulse Preventer inline with the yellow wire on the side that the stoplight switch and brake...
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  • Troubleshooting Weak Trailer Brakes on a Toy Hauler Even After New Axles
  • This could be a magnet wiring problem. It is unlikely that the magnets are bad on new assemblies, but if the wiring is not properly connected, it could cause problems. Check to see that the magnets are properly grounded to a clean, bare metal surface free of corrosion. A bad ground would not allow the circuit to be complete and lead to the brakes not performing like they should. You can also try running all of the brake grounds back to the main ground of the trailer. The new brake assemblies...
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  • How to Make Adapter so Freightliner w 7-Way Round w Separate Wiring Can Tow Trailer w 7-Way Blade
  • Sounds like you are trying to tow a trailer that uses a 7-way combined circuit with both your 2012 Chevy 2500 and a Freightliner that uses a 7-pin round connector with separate circuit. We have everything you would need to make an adapter that you could use when towing with the Freightliner. You will need a round pin male connector, # PK11702, and a 7-Way RV connector, # PK12707, along with an appropriate length of jacketed 7 Wire, # DW04914-1. You can then build a connector using...
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  • How to Find Brake Switch Wire in a 1978 Ford F-100 for Brake Controller Installation
  • Are your vehicle brake lights still working when you press the brake pedal? If so, then it sounds like maybe you are testing the wrong circuit. It sounds like you could be installing a brake controller and are looking for the correct circuit to run to the stoplight circuit of the brake controller. If this is the case keep checking the circuits you found near the brake pedal till you find one that has 12 volts when the brakes are pressed and none when released. For more information...
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  • Trailer Wiring Harness for 2016 Kia Sorento
  • The Curt Upgraded Circuit Protected Tail Light w/ Converter Hardwire Kit, part # 56146KIT is indeed a fit for your 2016 Kia Sorento if it doesn't have the tow package. I've confirmed this with Curt for you. For a hitch, the Curt # C13195 Class III hitch has been confirmed as a fit. For a ball mount, use # 2923 and for a trailer ball, use # 63845 for a 2 inch ball or # 19260 for a 1-7/8 inch ball. For a locking hitch pin, you can use # 40107.
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  • How to Rewire Trailer for 6 Way Connection with Separate Turn Signals and Brake Lights
  • First you will want a new 6-way like the Hopkins 6-Way Molded Connector, # H20036. Installing the 6-way plug will be made easier by using a junction box such as # 38656. This box mounts to the trailer frame and serves as a connection point between the trailer's original wiring and the new 6-way. Also you will want some Deka jacketed 2 wire, 10 gauge, brake wire # 10-2-1 to run the brake output circuit from the junction box to the brake assemblies as well as some Deka 16-gauge bonded 4-wire...
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  • Adapter to Convert 4-Pole Trailer Connector on a Jeep Wrangler Unlimited to a 7-Way
  • There are two types of 7-pin trailer connectors, the 7-way blade style which is much more common or the 7-way round pin which isn't very common at all, so I'll assume you have the 7-way blade style. I'll link you to our Trailer Wiring FAQ which has photos showing what both of them look like. There are two possible installation alternatives. If the trailer has brakes and you want them to function, you'll need to install a brake controller like the Tekonsha Prodigy P2, part # 90885. You'd...
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  • Wiring a 1992 Dodge W250 Pickup Truck for a 7-Way and 4-Way
  • Since you do not have a factory trailer wiring you will need to start with a 4-way (if you do not have one). For that you would want the # 118317. If you don't tow a trailer with brakes all you would need at this point to convert a 7-way is # 37185. This has a 4-way and 7-way at the connector. If you do have a trailer with brakes instead of the # 37185 you would want 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...
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  • Converting European 7 Way on Trailer to Work with US 4 Way on Lexus GX460
  • Thanks for the pictures! Since your trailer is currently equipped with a European style 7-way connector and your Lexus has a US style connector, you will need to cut off the connector on your trailer and install a US style like the Wesbar 4-Pole Flat Connector, # W787268, along with Tail Light Converter, # 118158. You will need to start by wiring the tail light converter to the 4-way connector, color for color. The next step will be to wire the output end of the converter to the...
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  • How to Power Trailer Taillights Without Being Connected to a Tow Vehicle.
  • The best option I can give you would be to bring with you a 12 volt car battery and run jumper wires from each of the circuits of the trailer connector to the positive side of the battery. Or you could use the # HM50928 in conjunction with the battery to allow you to easily control the power to each of the circuits. This would make things easier, but it is a costly option. To keep the battery charged you would need a battery charger like the part # CTEK56158.
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  • Troubleshooting Trailer Running Lights that Aren't Working
  • The first step to troubleshoot your problem would be to determine if the wiring problem exists with the vehicle or the trailer. Turn on the vehicle headlights, and use a circuit tester like part # 3808 on the pin on the trailer connector that feeds the running light circuit. If your vehicle has a 4-pole connector, test the pin being fed by the brown wire. If you are dealing with a 7-way connector, you would test the pin in the 11:00 position. If the tester indicates voltage on the pin...
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  • Why Do the Brakes of My Gooseneck Trailer Lock Up When 6-Way Adapter is Connected
  • The problem you are experiencing is due to the fact that there are two different ways 6-way trailer connectors are wired. The only difference between the two is that the brake output circuit and the 12 volt power circuit are swapped. So basically what is happening is that the 12 volt power circuit of your truck is sending voltage to the brake output circuit of your trailer which is locking them up. What you need to do is swap the wire going to the center pin of the 6-way adapter with...
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  • Right Turn Signal on a 2006 Chevy Silverado Isn't Working Properly
  • First thing I would do is disconnect the trailer from your 2006 Chevy Silverado so you can check the vehicle side connector with a circuit tester like # 3808. Test the right turn/brake signal and if it's still not working there might be a blown fuse or relay. Make sure the connector is clean and free of any dirt or corrosion. Using a wire brush should suffice. If the wires behind the connector are frayed, cut them off at the damaged area and re-splice back into the wiring. Another...
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  • Troubleshooting Electric Brakes Not Working on Dual Axle Box Trailer
  • In order to determine why the brakes aren't working on your dual axle trailer, I recommend first cutting the blue wire 5-6 inches behind the controller and use a circuit tester like the Quickee, # 3808, to verify that power is present. Power should be present when the manual override control is used. If no power is present, the brake controller may be malfunctioning and require replacement. The next step would be to test the 7-way on your tow vehicle. Using a circuit tester, verify that...
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  • Difficulty Fitting Male And Female Sides Of 6-Way Square Adapter Together
  • The first thing I recommend is to make sure the pins on the # 37995 are not bent and they align before connecting the two harnesses together. If it seems excessively tight or difficult to connect I recommend using some dielectric grease like part # 11755. This may provide enough lubrication to allow these two connectors to slip together a bit easier.
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  • Troubleshooting Trailer and Truck Lighting Problems When Trailer 7-Way is Connected
  • Thank you for providing a thorough description of the truck and trailer lighting issues you're having. The various problems you describe COULD be related to the same issue, corrosion in the trailer connectors, but there may also be multiple things you'll need to attend to. The best way to troubleshoot your concerns is to unplug the trailer from the truck's 7-way and then to test each one individually. Since your RV is used, it's wiring is my prime suspect. Step one for troubleshooting...
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  • Availability of Tester for Round 7-way Vehicle Socket
  • The part you referenced, Pilot 7 Pole to 4 Pole and 5 Pole Adapter/Tester # TC-701, does provide a testing function as well as adapt the 7-way RV-style socket on a tow vehicle to a 4- and 5-pole socket. If you do not need to change the connector type and just want to be able to test, you can instead use part # TR20117 from TowReady. The linked video illustrates. The tester plugs into the 7-way trailer connector on the vehicle and emulates a trailer. The LED indicator lights let you know...
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  • Troubleshooting Fuse Blowing in 2006 Chevrolet Silverado After New 7-Way is Installed
  • From the details that you have given it is pretty apparent that the issue is with the 7-way on the 2006 Chevrolet Silverado 2500HD. I recommend reviewing the installation instructions and making sure that each step was completed and that nothing has come loose. I would also check to make sure that the ground is secured to a clean and corrosion free bare metal surface. I have attached a wiring article for you.
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  • Installing a Prodigy RF Brake Controller on a 2006 BMW X5 without Factory 7-way Connector
  • To install your Prodigy RF brake controller # 90250, you will need a 4-pole to 7-pole and 4-pole adapter # 37185. You will need to hardwire a 12-volt power circuit using a breaker like # PK54540. The black wire provides 12-volt power to the trailer connector to feed your Prodigy RF brake controller. Use a butt connector like # 05732-2 to attach enough 10 gauge wire # 10-1-1 to reach the positive battery terminal. Twenty feet of wire should suffice. The 40 AMP circuit breaker # PK54540...
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  • Troubleshooting a Right Turn Signal on a 7-Way of a 2000 Ford F-150
  • 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 is clean...
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  • Troubleshooting Trailer Blinker that Stays Solid
  • 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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  • Turn Signal On 2012 Kia Sorrento SX Hyperflashing After Installing Wiring Trailer Harness
  • Sounds like you are experiencing what is termed 'Hyperflashing'. My best recommendation is to remove the # C56146KIT and see if the problem still persists. If it does there is a problem in the vehicle wiring. If the problem goes away, then the converter is probably bad and the harness needs to be replaced. If you do find you need to replace it I recommend the Tow Ready Wiring, part # 119147KIT. We have had good success with our customers that have used this kit. Please keep...
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  • How To Adjust And Test Electric Brakes On A Trailer
  • It sounds like you need to adjust the brake on your trailer. If you have electric brakes like the Dexter Electric Brake Assembly LH, part # 23-438, you can make the adjustments pretty easily. I have attached a video that shows trailer brakes being installed. If you go to about the 4:40 mark on the video it shows how to adjust the brakes. I have also attached a photo of an electric brake that shows where the adjustment wheel is located. You can also test the magnet on the brake that...
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  • Where do the Trailer Brake Magnets Wires Install on a 7-Way Trailer Connector
  • The black wire is probably your ground and you will secure it to a clean bare metal surface on the trailer frame. Your red wire is probably your power and that will go to your 7-way trailer connector, such as # PK12706, at the 5 o'clock position. I included a diagram of a 7-way trailer connector and a helpful article about wiring for you too.
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  • Trailer Light Fuse in 2004 Chevy Silverado Blows When Any Trailer is Connected to 7-way
  • Since you have the issue with your truck's trailer left turn fuse blowing no matter what trailer is connected, the issue is likely to be in the truck's 7-way socket or the wiring leading to it. Corrosion can build up in the truck's 7-way socket - either on the pin contacts themselves or even inside the back of the connector - and this can cause two circuits, such as the trailer left turn/brake circuit and the 12V auxiliary trailer power circuit, to become bridged together. The round...
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  • Brake Controller and 7-Way Recommendation for a 2010 Dodge Grand Caravan
  • The absolute easiest way to upgrade your 4-way to a 7-way would be to return the part # HM48470 and get the part number # ETBC7 instead. This comes with absolutely everything needed to upgrade the 4-way and make it fully functional, including the installation of a brake controller and running the power line to use for maintenance charging the battery of your trailer. A brake controller by itself would not come with everything needed to install in a vehicle. I attached an install video...
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  • 7-Way Blade Style to 4-Way Round Pin Adapter and Extension for Flat Towing a Car Behind a Motor Home
  • I have just what you need. For a 7-Way blade style trailer connector to a 4-Way round pin on the front of your toad you can use the Hopkins Flex-Coil adapter, # HM47043. I have linked a video showing the adapter in use.
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  • Wiring Configuration For 7-Way Vehicle And Trailer Connectors
  • I have attached a photo that details the wiring connections for a 7-pole round pin connector. It also includes the vehicle side wiring as well. I have also attached a photo of the 7-way blade style connector as well. The center plus is an auxiliary 12V circuit. I do recommend using a circuit tester like part # 3808 and test each wire on the vehicle to make sure you have the correct configuration on your connector. I have also attached a link to a helpful article about trailer wiring...
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  • Dimensions of Bargman 5th Wheel and Gooseneck 90-Degree Pigtail Harness # 51-97-407
  • I pulled a sample of the Bargman 90-Degree Pigtail Harness # 51-97-407 from our warehouse so I could take the measurement you require. As shown in the linked photo the distance from the rear surface of the mounting flange to the 90-degree bend is 3-3/8-inches.
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  • Adding a 7-Way Trailer Connector and Brake Controller to a 2003 Toyota Highlander
  • We actually have a kit that includes everything you will need to add a fully functional 7-Way trailer connector to your 2003 Toyotas Highlander. It is 4- and 7-Way installation kit # ETBC7. Once installed it will provide you with both a 4-Way and a 7-Way connector. It comes with the wiring and circuit breakers you will need along with a mounting bracket. I have included a couple of links that explain and show the ETBC7 installation for you. If you will be towing any trailers that have...
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  • Joules of Surge Protection for the Camco Voltage Defender
  • I spoke to my contact at Camco and he informed me that the Camco RV Power Defender Voltage Analyzer # CAM55310 that you referenced offers 1,050 joules of surge protection but it's primary function is to determine if a power outlet/pedestal is wired correctly. For more voltage protection you may be more interested in the # CAM55301 that offers 2,450 joules of protection or the part # CAM55306 that provides 3,850 joules of protection. Review videos for all three products are attached.
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  • Parts Recommendation to Install a 7-Way Trailer Wiring Harness in a 2015 Nissan Frontier
  • Since you do not have a factory trailer wiring you will need to start with a 4-way (if you do not have one). For that you would want the # C56225. From there you would need to convert the 4-way to a 7-way so that you can install a 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. If your trailer does not have brakes instead of the # ETBC7 you...
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  • Towing a European Spec Trailer with a US Spec 2014 Ram Pickup Truck
  • The issue that you are experiencing is due to the fact that the US and Europe use different types of connectors for trailers. In the US, the brake lights and turn signals are on the same circuit and there is just one circuit for running lights. In Europe, there are separate circuits for just about everything, which makes it easier to troubleshoot a problem should there ever be one. What you will need to do is change the connector on the truck to match what the trailer requires. To do...
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  • 4-Way to 6-Way Wiring Adapter to Power Lights and Charge Battery of Camper
  • Sounds like you have a 4-way connector at the rear of your 1999 Ford F-150 and are looking for a way to install a 6-way so that you can power the camper you have that has a Pollak 6-way like the part # PK11604. For an adapter you would want the part # 30637. This will plug into the 4-way and will convert the taillight signal to a 6-way. To activate the power circuit for the camper battery you will need to run the black wire from this adapter to the positive post of the truck battery...
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  • Reading 12-Volts on 6-way Connector of Kaufman Tilt Bed Trailer
  • Do you mean that you're using a circuit tester on your 6-way connector on the trailer (not the truck) and you're reading 12 volts on one of the pins? The only way that would happen would be if you had a battery mounted on the trailer. Typically, the battery is connected to the 12-volt supply circuit off the 6-way to receive a maintenance charge.
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  • Trailer Wiring Harness Adapter to Convert 4-Pole to 7-Way to Allow Charging Trailer Battery
  • To convert your Sienna's flat 4-pole trailer connector to a round 7-way RV-style that includes a circuit for charging a trailer battery you will use Hopkins part # 37185. This simply plugs in to your existing 4-pole and will then carry the same lighting signals. In order to have a 12V charging circuit active on the 7-way you will need to add a connection for that new circuit. You will also need 10-gauge wire, part # 10-1-1; a 40-amp circuit breaker, part # 9510; as well as ring terminals...
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  • Wiring Length of Adapter 6-Pole to 7-Pole Trailer Wiring Adapter
  • I went out to the warehouse and pulled the Hopkins Adapter 6-Pole to 7-Pole Trailer Wiring Adapter # 47435 that you referenced and took a measurement for you. The pigtail wires measure 6-1/2". It sounds like you want to wrap the 6-pin connector around the bumper to plug into the 6-pin socket already in your bumper. I doubt 6-1/2 inches is long enough to accomplish this. Your best bet is to use a 7-way socket, like # PK11893, a trailer end 6 pin connector like # PK11604, and enough jacketed...
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