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Expert Answers about Wiring


  • How to Get the 4-Way Wiring # 18252 Longer than 6 feet
  • What you would need to do is get the # 18252 that you referenced which comes with 6 feet, and then also order the part # 16-4B-1 which is bonded 4-way wiring sold by the foot. Basically you would need to order a quantity of the # 16-4B-1 in the amount of feet of extension you would need so that you would have the proper length of wire to install the 4-way on your trailer.
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  • Troubleshooting 4-Way Wire Harness installation On 2009 Cadillac SRX
  • The wiring harnesses and kit, part # HM48895 and part # HM46155 you referenced in your question are not designed to be a fit for your 2009 Cadillac SRX. If you find that you have the correct wire harness for your SRX you can check the wiring to make sure all of the wires have been connected as the instructions state. Also, you will want to make sure the ground wire has been secured to a clean bare metal surface. Loose or corroded grounds can cause some of the same problems you described....
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  • Dimensions of the Hopkins Endurance 7-Way Trailer Connector Socket # HM48480
  • The Hopkins Endurance 7-Way Trailer Connector Socket, # HM48480, measures 2-3/4 inches wide and 3 inches tall. I have attached a picture to illustrate these measurements as well as the distance between the mounting holes.
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  • Recommended Trailer Wiring Kit for a 2011 Chevy Malibu LTZ
  • The Tow Ready wiring kit # 119179KIT you are installing your 2011 Chevy Malibu LTZ can work with 2 or 3 wire systems. Your Malibu is a 2-wire system, as there is one bulb inside each tail light housing that illuminates for both the brake and turn signal functions. I have also included an FAQ and installation video too.
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  • Where on 2011 Toyota Tacoma to Access Reverse Lamp Circuit
  • I'm not sure which LED lamps you were considering, but a 4-pole or pin flat trailer connector doesn't carry a reverse light circuit. You'd need to tap directly into the wiring harness that feeds the vehicle taillights. If you access the area directly behind the taillights, you should easily be able to locate the wire feeding the reverse lamp. Tap the power feed for your LED reverse lights into that circuit. If your Tacoma has the factory 7-way connector, the center pin is connected to...
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  • 2008 Chevrolet 2500HD 12 Volt Battery Wire for 7-Way Connector
  • Sounds like you have the correct 7 way connector and the correct pins, but you are missing the wire that runs from the power posts to the connector. First let's make sure. In the under hood accessory fuse block there are two power posts on the engine side of the block. The post closest to the front of the truck should have a wire connected to it that runs back to the factory trailer connector and provides 12 volt power at the 1:00 position as you have stated. If the wire is not already...
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  • Availability of Circuit Testers for Use When Installing Trailer Wiring in Ford F-150
  • Thank you for your purchases from etrailer back in June. You are correct that we do offer trailer wiring kits that come pre-packaged with a basic circuit tester. One such example is the Draw-Tite Wiring Kit # 18252 that fits the 2010 F-150. But no worries! We also offer stand-alone testers like # 3808 and # 40376. At right I have linked a video showing how the tester # 40376 can be used to test for signals on trailer wiring. I was able to use your email address to find purchase...
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  • Recommended Way to Test Trailer Lighting With a Car Battery to a 4-Way Trailer Connector
  • The 5-way flat trailer connector in-line circuit tester # 20115 you referenced won't be needed. You would need to have a 12V power source and your jumper wire which will let you know if you have working trailer lights. The most common gauge trailer light wire for 4-way or 5-way trailer connector is 14-16. You will need to make sure that you secure the ground wire to the trailer frame. See picture to the right. I would recommend a circuit tester such as # 3808, if you are checking...
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  • Mounting Hole Size Required to Install Marinco 15-Amp Power Inlet # 14149
  • The Marinco 15-Amp Power Inlet # 14149 that you referenced requires a mounting hole just under 2-inches in diameter. My digital caliper indicated 1.9 inches is required to allow the threaded portion to fit through the mounting hole. The overall diameter of the mounting flange is 2-1/2-inches. Please refer to the linked photo. This part includes three mounting screws, a dust cap to protect the contacts and a soft plastic cap to protect the connection terminals in the rear.
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  • How to Test the Trailer Light Functions of a Trailer with a 4-Way
  • There is, but I will warn you it's pretty expensive. The Hopkins Tow Doctor Trailer End Test Unit # HM50928 is designed to test the connector on a trailer for function and would be perfect for what you are trying to do. Check out the review video I attached. A much more inexpensive option would be to use a jumper wire from a car battery's positive post to put voltage on all of the pins of your trailer's connector. You would need to test the three male pins next to the female pin....
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  • Is Tinned Wiring Used In Trailer Wiring Kits
  • The trailer wiring we offer like part # W002290, is designed to be used as a 5-wire harness, and works well with a trailer that has a surge coupler. The wires used in this harness are 16 gauge except the blue brake wire which is 18 gauge, and designed to be able to safely handle the current from a 12 volt system. The wires in this harness are not tinned. From my research I found that tinned wire is normally used in industrial wiring and used when the operating temperature of the wire...
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  • Troubleshooting Trailer Wiring That all Blinks When Right Turn Signal is Applied
  • You are having some interesting wiring issues on your trailer. First thing I would recommend you do is check to make sure all of the wires are grounded properly. Ground issues can cause bizarre trailer wiring behavior. Each lamp should be grounded either by its mounting studs being in direct connection with the trailer frame or by each lamp's ground wire being connected to the trailer frame. Next, you will need to inspect the wiring from the connector to the light assemblies looking...
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  • Audi Q5 2015 Trailer Wiring Installation
  • The best installation instructions I can give you for installing the # C56190 on your 2015 Audi Q5 would be to use a circuit tester like part # 3808 to test the wiring harness of the taillights you have on your vehicle and then wire up the # C56190 accordingly by function. Here's how the converter will wire to your taillights. Converter Brown Wire: Tail Light Circuit Converter Yellow Wire: Left Turn Circuit Converter Red Wire: Brake Light Circuit Converter Green Wire: Right Turn Circuit
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  • Compatibility of a Pollak Heavy-Duty 7 Pole Round Pin Trailer Wiring Connector with Blade Connector
  • The Pollak 7-pole round pin part # PK11700 is not compatible with Pollak 7 and 4-pole connector # HM40975 because it has blade style pins. What I recommend is you change your trailer connector to a 7-Way blade connector part # 54-77-003. You will also need a wiring harness like # PK11998 to install the 7/4-Way connector. It plugs into the back of the 4/7-Way. The connector mates with RV-style socket to form a weather tight seal. -Red - Left Turn and Stop - 14 gauge -White - Ground...
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  • Options for Grounding the 7-Way part # 37185
  • The Hopkins # 47345 that you referenced is an adapter that plugs into a vehicle's 7-way and provides a 4-way for a trailer to connect to. There wouldn't be any wiring needed for use with this product so I am sure you are referring to a Hopkins 7-way like part # 37185 or the # ETBC7. If so, running the white wire to the negative post of your battery is one way to do it. Either way it would work fine, but going to the frame of the vehicle would be a bit easier since it wouldn't require...
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  • Trailer Wiring Recommendation for 2012 BMW X3
  • In order to install trailer wiring on your 2012 BMW X3, I recommend taking a look at the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. This kit uses a powered converter with circuit protection to safeguard your vehicle and the module. Although the universal design of this wiring harness enables it to work with most vehicles, this harness has not been specifically tested on the 2012 model by the manufacturer or any of our installers...
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  • How to Confirm Trailer Wiring Configuration to Match 2007 Jeep Grand Cherokee
  • Trailer wiring often uses a particular wire color for a particular function, such as a white wire for ground, but there is no absolute rule that this will be the case. For this reason testing with a circuit tester like # 40376 is recommended. In the case of a trailer you can use a spare battery (or your Grand Cherokee battery) to test each trailer circuit to see what light activates with the 12V input power applied. The linked trailer wiring article illustrates the various connector...
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  • How to Wire up a Tow Vehicle to Tow a Jayco Style Flagstaff Trailer that Needs 12 Volt Power
  • 4-ways like what you have on your tow vehicle do not carry a 12 volt signal. They are designed for only taillight circuits. If you need a 12 volt circuit you are going to have to remove the # 30104 adapter as well as the 6-way square you have on your trailer. You will have to install a 7-way in it's place like part # H20042 and then use the # 37185 on your vehicle. The black wire of the # 37185 will need to get ran through a 40 amp breaker like part # PK54540. The 4-way of your vehicle...
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  • Replacing 4-Pole Trailer Connector on Trailer With 7 Different Circuits Feeding It
  • It sounds like you've got a pretty good handle on what you're dealing with. You're correct, the green is right turn/brake, yellow is left turn/brake, black/green is right taillight and black/yellow is left taillight. The remaining wires are almost certainly grounds. I'm guessing you're not the original owner of the trailer or the person who wired it last time. Rather than grounding each trailer lamp directly to the trailer frame by its mounting studs or individual ground wires connected...
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  • Adapter Recommendation to go from a 4-Way Vehicle Connector to 7-Way Trailer Connector
  • The correct adapter to use to allow you to go from the 4-way connector on your vehicle to the 7-way on your trailer would be the # 30717. The extra wires that come with this would just need to be taped up and out of the way.
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  • 4-Way to 5-Way Adapter Recommendation for a 1997 Toyota Sienna Towing Boat Trailer
  • The part # 20036 would be the best solution I could recommend for you, in order for the fifth circuit to be active you will need to splice it into the correct circuit of your 1997 Toyota Sienna though. If that fifth circuit isn't needed then you wouldn't need to worry about it. But most likely you need it to run to the reverse light circuit of your vehicle to activate a reverse lock out solenoid. I attached an install video for this for you to check out as well to show you how it...
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  • Troubleshooting Trailer Wiring that Blinkers Dont Work When Headlights are On 2007 Toyota 4Runner
  • 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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  • How Does the Tow Ready Trailer Wiring Harness Install on a Lexus GS350 2010
  • To install the Tow Ready Wiring # 119147KIT on your 2010 Lexus GS 350 you will need to test the wires of the taillight harness with the included circuit tester you have found to determine the functions of all of them and then wire the # 119147KIT to the appropriate wires as the instructions and diagram I attached indicate. I wish I had more specific instructions but we haven't had the chance to install this harness on a vehicle like yours so I can't give you more specific instructions...
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  • Can Tekonsha Trailer Wiring Tester # 8010 Detect Faults in an Enclosed Trailer Dome Light
  • The Tekonsha Trailer Wiring Tester # 8010 that you referenced is intended for connection to a trailer's RV-style 7-way blade connector plug. The tester's socket mimics a typical vehicle 7-way. This unit tests the exterior trailer lighting circuits. For your application to test an enclosed trailer's dome light a simpler and more cost-effective tester is the Draw-Tite # 40376 (sold by the same parent company as the Tekonsha). This hand-held probe tester lights up and beeps when it detects...
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  • Problems With Light Functions On Trailer After Installing 7-Way Connector
  • When you are installing a trailer connector like part # PK11893, you can run into issues due to the wires that the vehicle manufacturer used have different colors. This is why we always recommend using a circuit tester like part # 3808 to test the wires on the vehicle side, and make sure the wires on the trailer side connector match by function and not by color. I have attached a helpful article that explains trailer wiring you can check out. In the article there is also a helpful...
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  • Circuit Tester to Test Tail Light Wiring on a 2007 Cadillac SRX
  • There is no way to really know without using a tester. We have a test light that could be used, # 3808. Or a local auto parts store might have one they could loan to you. The only other thing I can thing of would be to disconnect each wire and either see what doesn't turn on or attach a separate light to the wire to see what makes it light up. But the downside is that you could get shocked and you would have to sever the wires to do this type of testing. I have linked a video to the...
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  • Adding a 7-Way Trailer Connector, Junction Box, and LED Lights to a Trailer
  • I think adding a 7-Way and a junction box and not to mention LED lights are great ideas! If you are going to replace all of those items, you may as well go the all out and replace all of the trailer wiring as well. Starting with a trailer side 7-Way connector you can use # H20042 which is 3 feet long. It doesn't have to be long though because it is going to the junction box. Speaking of junction boxes you can use # 38656. I have included a picture showing how it can be wired up and...
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  • Replacing a 4-Way Connector on Trailer with 7 Wires
  • From the information that you have given, I suspect that you have some additional ground wires on your trailer. Without being there to actually see the trailer, my best recommendation would be to wire the connector as follows: Green to Green for Right Turn Yellow to Yellow for Left Turn Yellow/Black and Green/Black to Brown for Running Lights White, White/Black, and Brownish White to White for Ground If the lighting on your trailer still isn't working as it should, I recommend...
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  • 4-Way Adapter and 7-way Recommendation for a 2003 Chevy Silverado
  • The # 47345 that you referenced is designed to plug into an existing 7-way connector at the rear of a vehicle. Based on the two pictures you submitted it looks like you unplugged your current 7-way from it's harness and are trying to plug the # 47345 directly to it. This won't work. To use this adapter you will need to put your 7-way back on the connector. Another option that you might like even better would be to plug the harness you have into a # HM40975 as this will give you a...
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  • 7-Way Round to 4-Way Flat Adapter Recommendation
  • As long as the 7-way round you have on your trailer is wired so that the stop/turn circuits are on the same circuits the # 118709 would be perfect for what you are trying to do. If the 7-way you have is a Euro style that has separate taillight circuits then you would need to make an adapter, but I doubt this is this case. If your 7-way is wired like the diagram I attached you would be good to go.
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  • How to Install a Brake Controller on a Vehicle that has a Factory 4-Way
  • The best way to install a brake controller like the Prodigy P2 part # 90885 on a vehicle like your 2001 Mercedes 320 that has a factory 4-way is to use the # ETBC7 that you purchased as well and install it according to the installation instructions by hardwiring everything. For your vehicle there isn't a simple plug-in adapter available so using the # ETBC7 would be your best option. I attached the installation instructions to the right plus an install video for you to check out.
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  • How to Install a Brake Controller in a 2000 Land Rover Discovery II
  • What you can do is test the wiring of the connector you found with a circuit tester like # 3808 to see if there is a stoplight switch circuit on the harness that you could use to install the Prodigy Brake controller part # 90885, but we do not have a plug in harness that will allow for brake controller installation on your vehicle. If not, then you will need to wire the controller up to the wiring of your brake switch like the install instructions for the # ETBC7 indicate. I would recommend...
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  • Converting US Style 4-Way Trailer Connector to a European Style 7-Way Connector on a Bike Rack
  • In order to get the US style 4-Way to work with the European style 7-Way you are going to have to do a little hardwiring. What you will need is a vehicle side European 7-Way and a special converter, # 118158. You will have to cut off the 4-Way on the vehicle. The wires left over should be white for ground, brown for running lights, yellow for left turn/brake lights, and green for right turn/brake lights. On the input side of the converter match up the wires color for color. Brown will...
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  • Plug and Play Trailer Wiring Harness for 2001 Buick LeSabre
  • There isn't a plug and play option available for the 2001 Buick LeSabre, most likely due to the age of the vehicle and the fact that it's not frequently used to tow. However, there is an available hardwire option. You can use part # 119179KIT, which would wire directly into the wiring harness that feeds your taillights. The best place to tap into your taillight wiring is directly behind the taillight assemblies. Use the included tester to probe the wires feeding the taillights. Have...
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  • Recommended Trailer Wiring Harness for a 2001 Buick LeSabre Limited
  • Since there isn't currently a plug and play option vehicle wiring harness for your 2001 Buick LeSabre Limited, I recommend is our Tow Ready wiring part # 119179KIT. This kit comes with a wiring harness, install kit, circuit tester, quick splice connectors and intergrated 4-pole connector. I highly recommend using dielectric grease to help prevent corrosion from water exposure. Part # 11755. See video of the 2005 Acura at the 2:20 mark. I have included an installation video for...
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  • Availability of Plug-and-Play Trailer Wiring Harness for 2001 Buick LeSabre
  • There isn't a plug and play option available for the 2001 Buick LeSabre, most likely due to the age of the vehicle and the fact that it's not frequently used to tow. However, there is an available hardwire option. You can use part # 119179KIT, which would wire directly into the wiring harness that feeds your taillights. The best place to tap into your taillight wiring is directly behind the taillight assemblies. Use the included tester to probe the wires feeding the taillights. Have...
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  • 4-Way Trailer Wiring Harness For 1989 Honda Accord
  • You are correct. For your 1989 Honda Accord, the correct wiring harness would be the Curt Wiring Harness, part # C56175. The connection points for this harness are located behind the driver side tail lights. This comes with the necessary wire connectors and installation instructions. When installing this harness I recommend a circuit tester like part # 3808 to test the wires on your Accord. When working with electrical connectors I recommend using dielectric grease like part # 11755....
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  • Troubleshooting 7-Way Connector of 2006 Toyota Sequoia With No 12-Volt Feed at 7-Way
  • If your 7-way on your Sequoia was installed at the factory, the 12-volt circuit should be active. Check the fuse box under the hood for a blown or missing fuse. If there's no blown fuse, you trace the 12-volt circuit from the rear of the vehicle looking for a loose connection, but abandoning the original and installing your own circuit as described below might be the simplest course of action. If the 7-way was installed aftermarket, check the terminal for the 12-volt pin at the rear...
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  • Converting a European 7-Way on a 1996 Land Rover Discovery to Work with a US 6-Way
  • There is no adapter to go from a European 7-Way to a US style 6-Way. You will either have to convert the connector on the vehicle or the one on the trailer. It all depends on what works best for you. If you only tow the one trailer then converting the vehicle makes more sense. But if you tow other trailers that need the European 7-Way then converting the trailer makes more sense. To convert the vehicle you will need a vehicle side 6-Way, # PK11609, and you will also need a special...
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  • Installing a 7-Way and Brake Controller on a 1998 Ford Expedition with 4-Way Flat Connector
  • On a 1998 Ford Expedition with a factory 4-Way trailer connector, it is fairly easy to install a 7-Way and a brake controller. All you will need is the 4- to 7-Way adapter and the proper brake controller wiring harness. If you follow the factory 4-Way forward on the vehicle you will come to a point where it plugs into a forward connector. There are more wires going into the forward connector then go out to the 4-Way. On the forward connector and the wiring running to it, pull back the...
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  • How Does Trailer Wiring Install on a 2008 Saab 9-3
  • I attached a set of installation instructions for the wiring kit you have part # 119179KIT to the right. But basically some vehicles (like yours I believe) combine the stop and taillight functions onto one circuit. These vehicles will require that you attach the trailer light power module red stop wire to that same circuit on the vehicle and then ground the brown tail light circuit. Some vehicles combine stop and tail light functions onto 1 circuit and then also have an additional...
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  • Adapter to Mate Round Vehicle Connector with 5-Pole Flat Trailer Connector
  • Most often vehicles with factory- or dealer-installed trailer connectors have a 7-way RV blade style connector, but indeed sometimes a 6-pole round pin socket can be found on vehicles. The part you referenced, Pilot 6 Pole to 5 Pole & 4 Pole Adapter # TC-129, has the correct configuration to adapt your vehicle and boat trailer that has a 5-pole flat connector. Adapters are great for occasional or short-term applications but you may find that over time you'll prefer to replace one of...
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  • Recommended Wiring Harness for a 2015 Volkswagen Golf TSI
  • For a 2015 Volkswagen Golf TSI, I recommend using the Tow Ready upgraded heavy duty modulite circuit protected vehicle wiring harness with install kit, # 119190KIT. I have included an instructon link to the right for you as well. This kit includes everything necessary to hardwire it to your vehicle. A nice feature is the kit has short circuit protection to safeguard itself and the tow vehicle against harmful electrical shorts and mis-wire situations. Another option you can use is the...
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  • Trailer Wiring Recommendation for a 2003 Ford Crown Victoria
  • Yes, the Hopkins Active Taillight Converter with Install Kit # 46255 that you referenced has been confirmed to fit your 2003 Ford Crown Victoria so it would be a great option to use to install trailer wiring. I attached installation instructions to the right for you to check out as well. Another option you have is the part # 119178KIT, this is also confirmed to fit your vehicle. We had the chance to install this wiring kit in a very similar 2003 Crown Vic as yours and shot an install...
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  • How to Make an Adapter that Will Go From a 7-Way Round Connector to 7-Way Flat RV
  • The problem that you will encounter that would prevent the # PK12-724 from being the correct adapter to use is that round 7-way wiring is designed where the brake and turn signals are on separate bulbs and typically RV style taillights are combined where the brake lights and turn signals are on the same circuit. If your trailer with the 7-way flat happens to have separate trailer wiring the # PK12-724 would work, but most likely it doesn't. Or, if your heavy duty 7-way round has combined...
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  • Wiring 12-Volt Accessory Circuit to 7-Way Trailer Connector on 1997 Chevrolet 3500 Cab and Chassis
  • I believe the remaining wire you're speaking of is actually light blue, and is meant to provide power for a third brake light installed on a camper shell. If you want to run a 12-volt accessory power circuit, you can run it from the positive battery terminal to the 7-way. Your truck MIGHT have a 12-volt accessory wire ran already...you'd just need to make the connections on each end. Look on the driver's side frame rail at the rear of the truck. You're looking for an orange wire. If...
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  • Turn Signal Not Working when Using Brakes and Using Hopkins 40955 Wiring Kit
  • Since you have a new trailer connector on your vehicle that tells us that the issue is likely on the trailer somewhere and it sounds to me like it is a bad ground. Make sure all your ground connections are good and clean. There will be a ground connection coming from the trailer connector to somewhere on the trailer tongue and each of your trailer lights should have a ground connection through either a ground wire ran to the trailer frame or grounded through a mounting stud on the light...
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  • Solutions for 2010 Range Rover that Doesn't Detect LED Trailer Lights
  • Normally for the problem you are describing we recommend the # TR20141 as it is designed to fix the problem you are describing, but we have found that this product does not work on Range Rovers for some reason. The best recommendation I could make for you would be to replace the lights on your trailer with incandescent bulbs or install load resistors on the trailer lighting circuits like part # P230004A-2. I attached a link to the right that has all of the trailer lights we offer...
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  • Troubleshooting a Trailer Right Brake Light Won't Function
  • It sounds like the problem is on the trailer and is ground related. I would inspect the grounds of the light assembly you have installed on the right side of your trailer and make sure it is connected to a clean metal surface. A lot of assemblies ground through their mounting hardware so you will want to make sure that the assemblies are connected to a clean metal surface. The brake lights will require a better ground than the blinker since it only illuminates one circuit for the blinker. I...
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  • 4-Way to 5-Way Adapter Recommendation for a Ford F-150 Towing Trailer with 5-Way
  • It sounds like you have a Wesbar 5-way flat on your trailer and are looking for a way to convert the 4-way on your F-150 to work with it. What you will want is the part # 20036. This will plug into the 4-way on your truck and will have a 5th wire that will need to tap into the reverse lights of your vehicle if the 5th circuit on your trailer is for reverse lights or reverse lock out. I attached an install video for this product for you to check out as well.
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  • Troubleshooting a 2013 Ford Escape that Hyper Flashes When Connected to Trailer with LED Lights
  • You have a couple options to solve the hyperflashing problem you are experiencing with your 2013 Ford Escape when towing your RV. You can either use a product like the part # C57003 or you can take your vehicle to a Ford dealer and they will do a software update on your vehicle which should fix the problem. There should be a technical service bulletin that said that trailers with LED taillights can cause the Escapes to hyper flash and they can fix it if you bring the vehicle in to them.
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  • Trailer Connector on 1994 Ford F-250 Only has 12 Volt Power on the Center Pin
  • If it is really a 6-Way and not a 7-Way blade style trailer connector then the center pin being hot would indicate that particular pin is the 12 volt power circuit. But the other functions not working could mean that tow package wiring fuses and/or relays are missing or need to be replaced. Check the truck owners manual to find the locations of any and all fuses related to the tow package wiring. If the wiring was added and is not factory then you will need to check the wiring connections...
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  • Changing a US Style 7-Way Vehicle Connector to a European Style 7-Way Connector
  • The European 7-Way does the same thing that the US 4-Way does. There isn't an adapter available because the European 7-Way has separate circuits for nearly every function on each side of the trailer. The US style 4 or 7-Way has combined brake lights and turn signals. What you will have to do is change over the US style 7-Way to a European one. You will need 1 European style vehicle side 7-Way and one special converter that separates the combined signals to separate ones. You will...
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  • Trailer Brake and Tail Lights Go Out when Headlights on 2000 Chevy Silverado Come On
  • 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 is the Diameter of the Cable on Hopkins 7-Way Molded Trailer Wire Connector # HM20048
  • On the Hopkins 7-Way Molded Trailer Wire Connector # HM20048 the outer diameter of the cable is 5/8 inches. On the inside the green, yellow, brown, and purple wires are 16 gauge and the white, blue, and red wires are 12 gauge.
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  • Converting a 6-Way Rectangle Plug on a Monaco Diplomat to a 4-Way Flat for a Boat Trailer
  • The 6-Way square trailer connector is not used by a lot of trailer manufacturers. A lot of Jayco trailers may have them but mostly you come across the 4-Way flat, like what you have on your trailer, and the 7-Way blade for RV applications. What I recommend is to convert the 6-Pole on the Monaco to a 4-Way. You can do this very easily by removing the 6-Way plug, and then testing the wires for function using a circuit tester like # 3808 if needed before installing them in a new 4-Way,...
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  • Trailer Lights are Erratic After Switching to LED Lights
  • Jesus is a good driver, but not a trailer expert. And that's ok because your trailer is not possessed . . . well, it could be, but that is not what is causing this problem. What you have here is a ground problem. Ground problems can cause all sorts of funky things to happen. The good news is ground problems are usually very easy to fix. The bad news is that you have to find the problem before you can fix it. Ground problems normally show up when there is more draw on a system such as...
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  • LED Trailer Lamps Stay Illuminated When Tow Vehicle is Shut Off
  • When the tow vehicle is shut off, the only pin on its 7-way trailer connector that should show any power is the 12-volt accessory circuit, which is the pin in the 1:00 position. If the trailer lights are illuminating when the tow vehicle is shut off, the only possibility is that there's a small short either in the 7-way connector or in your adapter that is allowing some power from the 12-volt accessory circuit to bleed over into one of the lighting circuits. With the vehicle shut off,...
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  • Recommended Ways to Power a Winch on a Trailer
  • The best way to power the winch on your trailer would be to have a large battery installed on the trailer that will power the winch and then use the 12 volt accessory circuit from the 7-way on your truck to put a maintenance charge on the battery. Or if you have a Superwinch brand winch with up to a 16.5k capacity you could get the Trailer and Vehicle Electric Winch Wiring Kit, for up to 16.5K Winches # SW2008. This sounds more like what you would want. This will run a power wire from...
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  • Trailer Lights Go Out When 2002 GMC Yukon Headlights are Turned On
  • This sounds like 1 of 2 things. Either a bad ground or the vehicle side wiring is being overloaded (which can happen if there are a lot of lights on the trailer). 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...
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  • Re-Wiring Old Travel Trailer to Convert from 5-Pole Flat to 7-Way RV Style Blade Connector
  • When a tow vehicle and trailer have different style connectors the options are to re-wire one of them or to use an adapter. Adapters are fine for a quick fix but for long-term reliability you are better off doing exactly as you suggest - wiring in a new connector on the trailer to match the tow vehicle. This avoids the adapter and the potential for trouble down the road from the extra connection points. A junction box like # 38656 is a perfect way to connect the 7-way harness # H20046...
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  • Replacement 7-Way Recommendation for a 2002 GMC Yukon with Factory 7-Way
  • Yes, the Pollak Replacement 7-Pole # PK11893 that you referenced would work as a replacement 7-way on your 2002 GMC Yukon that had a factory 7-way.
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  • Troubleshooting 7-Way on a 2001 Chevy Truck that All Circuits aren't Functioning
  • The first place you will want to check is the fuse box on your 2001 Chevy 2500 Silverado. You will want to look for the trailer wiring fuses and replace them as needed. Since I am not entirely sure what circuits on your truck aren't working it could be you are missing a couple connections under the hood of your truck for the brake controller wiring to be completed. Check out the FAQ article I attached to the right for more info on this. Corrosion in the 7-way connector or on the back...
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  • Trailer Wiring Harness for 2006 Maserati Quattroporte
  • We don't have a vehicle specific taillight converter for your Maserati. Although there are several different universal converters like # 119179KIT, it hasn't been tested on your vehicle so I would be hesitant to recommend it. I'd recommend checking with your Maserati Dealer to see what they recommend.
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  • Pin and Receptacle Style for Arcon RV Power Cord Adapter - 110V - 30 Amp Female to 15 Amp Male
  • The end that plugs into 110 volt outlets is the typical 3-prong with a ground. The other end is a 3-prong receptacle with the top two being blade style and the lower center one a typical rounded ground. I have included a picture showing both ends.
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  • No Power On 12 Volt Circuit on 7-Way Trailer Connector on a 2006 GMC Sierra 2500HD
  • On some GM trucks, even those with factory tow package, the wiring is not always complete. You may need to manually run a wire from the front of the truck to the back of the 7-Way. I have included a link to the right that should help. It talks about the under the hood connections that might need to be made when installing a brake controller but also mentions the 12 volt power wire. Presumably, if the wire is attached directly the positive terminal, it would have power all the time. But...
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  • What is the Wire Gauge on the Arcon Temporary RV Power Cord Extension - 110V - 30 Amps
  • In the Arcon Temporary RV Power Cord Extension # AR14248 the black and white wires inside are 6 gauge and the green wire is 8 gauge. Black is the power wire, white is neutral, and green is ground.
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  • Recommended Location to Attach a License Plate to a Tilt Easy Hauler
  • I would recommended checking with your local law enforcement or state highway patrol because laws and regulations vary from state to state. On the other hand, I have seen a couple license plates mounted to the wheel fender. I would recommend a license plate frame such as # CR62032. It will show more plate in all 50 states. A LED license plate light mounting bracket such as # LPL55CB could also be a great addition especially since you are towing a easy hauler. I have included a...
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  • Trailer Connected to 2012 Ram 2500 Causes Truck Reverse Lights to Come On
  • The center pin on your 2012 Ram 2500 is probably wired to the reverse lights. The center pin on the trailer is probably wired to a trailer mounted battery or breakaway system battery and it is back feeding to the trucks reverse lights. The trailer could have more than 1 battery on it. What you will need to do is figure out what is wired to that center pin on the trailer side. I have included a picture that shows the pin out functions of a vehicle side and trailer side 7-Way that...
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  • Parts Needed to tow a Trailer with a 2005 Volkswagen New Beetle
  • First thing you want to do is consult the owners manual of your 2005 Volkswagen Beetle to determine if there are any restrictions on towing with your vehicle. For a hitch you would want the part # 24679. I attached a set of installation instructions plus an install video for this hitch to the right. For a ball mount you will need the part # 3593, for a 1-7/8 inch hitch ball # 19256, or depending on your trailer you may need a 2 inch ball. For that you would want part # 19258. You...
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  • Recommended Way to Re-Wire a Boat Trailer with a 7-Way Plug
  • The adapter will work but it's more of a short term solution because of the potential corrosion issues in the future not to mention when you introduce additional connection points problems can arise. I would test the reverse lockout (purple or blue wire) with a circuit tester with the 7-Way center pin. If that works you are good. I would recommend rewiring the trailer with a 7-Way plug because it will prove to be more reliable than using an adapter. I would start with a trailer junction...
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  • Troubleshooting Running Lights and Dash on 1986 Ford Econoline Jayco Motorhome
  • You said you checked the fuses. Some motorhomes have fuse boxes in multiple locations, inside the engine compartment, inside the cab under the dash, and even in the camper sewer/electrical compartment. Sometimes a fuse may appear to be in good condition, but really needs replacing. To rule that out, take a new fuse that has the same rating and insert it into the proper location. If the problem is a short, and the next fuse that you insert shorts out as well, you will need to use the...
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  • Replacement Trailer Connector For 2001 Toyota Tundra
  • If the connector you cut off your 2001 Toyota Tundra is a 4-way, the connector I recommend is part # 118001. This is a 48 inch long harness with the vehicle end 4-way connector. If you cut a 7-way connector off, then I recommend the Hopkins Endurance Quick-Install 7-Way Trailer Connector with Universal Pigtail Harness, part # HM47210. Since you said you cut the wires on your truck, you can simply attach this harness as a replacement. To keep the connector more secure I recommend...
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  • Wiring Trailer Reverse Lights Using Spectro Trailer Wiring Junction Box # 38656
  • Power for your trailer's backup lights needs to come from the tow vehicle's reverse light circuit. You will need to choose one of the available circuit posts on the Spectro Junction Box # 38656 as the one you'll use for the reverse light circuit. Usually this would be the Auxiliary post at the far end of the box opposite the ground. Please refer to the linked photo. It does not matter what color wire you use to wire the trailer (although using the conventional colors does help keep...
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  • What Is The Wiring Configuration For 4-Way Round Connector
  • On a flat 4-way connector, the standard function is Green is the right turn signal and brake, Yellow is left turn signal and brake, White is ground, and Brown is the running lights, used when the headlights are on. You may want to test the wires for function just to be sure. You can use a circuit tester like part # 3808 for that. I have attached a photo that shows typical wiring for a 4-way round connector.
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  • Brake Controller Installation on 2011 Tiffin Motorhome on 2011 Freightliner Sprinter Chassis
  • Although the Sprinter chassis might have connector for the installation of a brake controller, our brake controller manufacturers don't show a listing for your vehicle. If your MH came with a 7-way at the rear bumper, it might possibly be pre-wired for a brake controller. You'd want to check with Tiffin to see if this is the case, and if so, find out which plug-and-play brake controller wiring harness is needed. If there is no 7-way, you'll need to do a hardwire install. The first step...
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  • Troubleshooting Dash Lights and Running Lights not Working in 1986 Jayco Econoline Class C
  • Without knowing more about the problem you are experiencing, like whether it's the vehicle that's experiencing the problems or the trailer wiring, the best recommendation I could give would be to check the fuse box looking for running light and dash light circuits and replace the fuses as needed as this would be the most likely cause of the problem you have. Beyond that you would want to track down wiring diagrams of your vehicle to see if wiring is damaged and needs replacing. At this...
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  • Trailer Wiring Harness for a 1957 Chevy Pickup Truck
  • The first thing to determine is why the other converters stopped working so soon. Modern converters are designed to work on 12 volt systems with a negative ground. Many older vehicles used a 6 volt system and/or positive ground electrical system. Make sure that the 1957 Chevy Pickup truck is a 12 volt, negative ground system. It is also possible that the trailer has enough lights to overdraw the converters. Converters have amperage ratings and if exceeded that can cause them to blow....
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  • Converter To Wire 4-Way Connector On 2009 Jeep Compass To 7-Way European Connector On Trailer
  • We currently do not carry the vehicle-side plug for a European plug like you mentioned is on your motorcycle trailer. You will need to find one locally. You can use the tail light converter like part # 118158, and along with a 4-way harness like part # 18004, you can make an adapter that will work for you. I have attached a photo with all of the wires for input and output noted you can check out. Diodes will not be needed because the trailer will not backfeed through the system.
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  • Why Do Some Vehicles Need a Converter to Add Trailer Wiring Like a 2001 Chrysler Town & Country
  • Converters are required when a vehicle has what is called a 3-wire or separate lighting system. These systems will have turn signal circuits that are separate from the brake light circuits. Trailers use a 2-wire or combined system meaning the brake lights and turn signals are on the same circuit. A converter is needed to take the separate signals from the vehicle and combine them so that the trailer lights operating on a combined system will work properly. Wires and fuses connected...
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  • Location of Wire for Third Brake Light on Camper Top of 2010 Sierra 2500HD
  • Look under the dash for the dedicated brake light wire. It will be situated below and left to the steering column. Find the bundle of wires held together with white tape. The tape should have the functions of the wires on it. The wire you need is likely light blue. Test it with a circuit tester, like # 3808, to be sure it is the correct one. It should only show a signal when the brake pedal is pressed. If that wire is used by a brake controller, look at the brake switch located above...
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  • Troubleshooting Trailer Running Light Circuit that Quit Working on a Tow Vehicle
  • Sounds like a blown fuse on your tow vehicle. Check out the fuse panel and look for tow package related fuses and check them all. Most likely one will be blown and need to be replaced. I attached an FAQ on 4-way troubleshooting for you to check out as well.
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  • Troubleshooting Trailer Blinkers that Both Blink When Either Turn Signal is Applied
  • It sounds like you have the blinker circuit of your 1998 F150 run to the running lights circuit on your trailer wiring so when the blinker is applied both of your running lights are flashing. Any time you see trailer lighting that illuminates dimly when the wrong circuit is applied is usually indicates that there is a weak ground on the trailer wiring circuit. How that all works is beyond me, but what you will want to do is return the trailer to the previous wiring configuration you...
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  • Troubleshooting Trailer Lights that Don't Function Properly Vehicle Head or Running Lights are On
  • 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 metal...
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  • 4-Way Recommendation for a 1997 Dutchmen Popup with a 6-Way Square
  • The pinout of the # 30104 that you referenced will only work on Jayco trailers. Although the connector is the same the wires are run to different pins on the 6-way side of the connector. Your best option would be to cut off the 6-way on your trailer and then wire up a 4-way to the trailer wires. For that I would recommend the # HM48110. You will need to wire the 4-way up by function to your trailer and not wire color as they most likely are different. The yellow wire of the 4-way...
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  • Hopkins Quick-Install Trailer Connector Adapter # HM47200 Recommendation for a 2003 Dodge Dakota
  • Yes, the Hopkins Endurance Quick-Install Trailer Connector Adapter # HM47200 that you referenced would work great for you and would only require you to plug the 4-way of the adapter into the 4-way of your 2003 Dodge Dakota and the trailer lights would function.
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  • Length of the Wires of the Pollak 7-Pole and 4-Pole Trailer Connector # HM40975-11998
  • The total length of the wires of the Pollak 7-Pole and 4-Pole Trailer Connector # HM40975-11998 is 4 feet. I attached a review video for this product for you to check out as well.
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  • Trailer Wiring Harness # 119178KIT Installation Method for Kia Sportage 4-Cylinder
  • Thank you for your recent purchase of a trailer wiring harness for your Kia Sportage. The Tow Ready kit you selected, part # 119178KIT, is a specified fit for the 2006 Kia Sportage 4-cylinder. Since this is a universal-fit harness it will install in essentially the same way in all vehicles it fits. The process consists of removing the two taillight assemblies, using the included circuit tester to confirm the correct wires to splice into, and then using the included quick-splice connectors...
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  • 7-Way Round to 7-Way Flat Trailer Adapter Recommendation for a 1993 Ford Bronco
  • As long as the 7-ways on both your 1993 Ford Broco and your Fleetwood camping trailer are wired up like the diagrams I attached the Pollak Trailer Connector Adapter # PK12-724 that you referenced would work as-is without having to be rewired. I also attached a review video for this adapter.
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  • Does RV Power Cord Adapter, 50A Male to 30A Female have a UL Rating
  • I spoke with my contact at Coleman Cable about RV Power Cord Adapter, 50A Male to 30A Female # 09554. He said that this particular product is not UL rated (or CSA rated for Canada).
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  • Can I Charge Phone with Hopkins Multi-Tow Trailer Connector Adapter While Truck is Off
  • I spoke with my contact at Hopkins and he said as long as your Tundra is wired so the accessory power is hot all the time (and most of them are) then you will be able to charge your phone with the Hopkins Multi-Tow Trailer Connector Adapter, part # HM47675, when the truck is off. I have included a link to the installation instructions for you to check out.
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  • Troubleshooting Why Trailer Lights Go Out When You Hit the Brakes
  • It sounds to me like you may have a ground problem. There are several places to look for a poor ground connection. I recommend starting with the trailer connector on the trailer. Check to make sure that the ground wire is secured to a clean metal surface on the trailer. In addition, each lamp/signal will also need to be grounded. Typically the lamp/signal is grounded through the mounting bolts having direct contact with the trailer frame. If the area that the lights are mounted to...
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  • Would the Tekonsha 7-Way Emulator Connector # 6562 Work on 2013 Ram Integrated Brake Controller
  • The Tekonsha 7-Way Trailer Emulator Blade Style Connector # 6562 that you referenced SHOULD work with the factory brake controller you have in your 2013 Ram 2500. However, we do know for a fact that this won't work on the 2009-2012 Dodge controllers Factory integrated brake controllers are sort of hit and miss in terms of compatibility with items such as the Tekonsha emulator, # 6562. It all depends on the power draw required to tell the integrated brake controller there is a trailer...
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  • Parts Needed to Install a Prodigy RF and 7-Way Connector to a 2013 Ford Escape
  • The Hopkins adapter # 37185 works great with the Prodigy RF wireless trailer brake controller # 90250. You will also need about 20 feet of 10 gauge wire # 10-1-1, and 40 AMP circuit breaker # PK54540. The Prodigy RF will need 12-volt circuit on a 7-way to work which is why you need the 10-gauge wire and circuit breaker. I recommend using dielectric grease between the two connection points to help keep down corrosion. The Edelman dielectric grease part number is # 11755 I have included...
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  • Will Hopkins Endurance Flex-Coil Trailer Connector Adapter Work With Heavy-Duty 4-Way Connector
  • If you have a round 4-way connector, the Hopkins Endurance Flex-Coil Trailer Connector Adapter w/ Nite-Glow, part # HM47043, should work just fine. This adapter plugs into a 7-pole blade-style connector for use with a 4-wire round connector on your towed vehicle. This also has a Nite-Glow feature so you can make your connections even in the dark. I have attached a video you can check out for this connector.
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  • Rental Trailer Caused Fuse to Blow Now Trailer Lights Won't Work After Replacing Fuse
  • It sounds like the rental trailer had a short and caused the fuse to blow. It could have actually caused more than one fuse to blow (or a relay if your vehicle also uses relays for the tow package wiring). Use the vehicle owner's manual to find all fuse and relay locations related to the tow package wiring to see if there is something else that needs to be replaced. To test the vehicle side trailer wiring you can follow the help article I have linked to the right.
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  • Troubleshooting Left Turn Trailer Taillight Not Functioning
  • Without knowing what vehicle you have or what trailer wiring harness you have installed on that vehicle it is pretty difficult for me to say what could be wrong, but since you checked the tow package fuses you have at least ruled that out as well as determined that the problem is most likely on the vehicle side. However, if you haven't already I would recommend you use a circuit tester like part # 3808 to verify that there is not voltage on the left turn/stop circuit when the left blinker...
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  • Trailer Wiring Recommendation for a 2015 Subaru WRX
  • I was able to track down the product review where a customer said he used the Tow Ready Wiring harness part # 119147 on a 2015 Subaru WRX and it worked well. However, since Tow Ready hasn't officially listed your vehicle as a fit for this wiring harness I cannot safely recommend it for you. I would wait till they release information on whether or not this harness has been confirmed to fit your vehicle.
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  • 2014 Mercedes Benz GLK 250 Bluetec Wiring Harness Recommendation
  • Although they are not specific to your 2014 Mercedes GLK-250 BlueTec I did attach a set of installation instructions for the Curt Wiring Harness part # C56190 that you referenced to the right that will give you a good idea on how to install it on your vehicle.
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  • Generator Recommendation for a Trailer with a Heater
  • A heater is going to draw enough amperage that you are going to want to use a generator to power it. Based on the usual amount of amperage that a heater will draw according to Powerhouse, (1,400 continuous watts), I would recommend the Powerhouse Professional Series 2000Wi 2,000-Watt Inverter Generator # PH60376.
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