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Expert Answers about Wiring


  • 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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  • Troubleshooting Left Stop/Turn Light Not Functioning On Trailer
  • Sounds like you are trying to figure out why the left brake light on your trailer isn't functioning but the rest of the trailer lighting seems to be working. Typically this problem is due to a bad ground on the light assembly. The light grounds should be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt...
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  • Locating Ground Wire in Tow Package Wiring Harness of 2009 Lexus RX350
  • You can simply ground that white wire to clean metal on the vehicle frame. This will complete the ground circuit, as the negative battery terminal is grounded to the frame or chassis. It's possible the white wire is located further up in the wiring harness so you can remove some of the wire loom and locate it, but grounding the white wire to the vehicle should work just fine for you. If you click the link I provided, you can see the # 18002 being installed on a 2007 RX350.
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  • Comprehensive Vehicle Side Trailer Connector and Wiring Tester
  • Most of the vehicle end trailer connectors we have will test for voltage on the circuits. If there was a short to ground then all of the lights would light up on the tester and you would know there is a problem. We do have a comprehensive trailer side tester, # 8010, which goes much further than any of the regular testers like # I26. But it is not designed for the vehicle side. For the vehicle side we have # HM50918 that can test multiple connector types on a vehicle (4-Flat, 6-Way round,...
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  • Replacement Trailer Connector For 1995 Ford F-150
  • I am not sure if you need the replacement connector for the vehicle side of your 1995 Ford F-150 or if you need the trailer connector that would plug into the F-150, so I will give you some options for both of them. You can use a circuit tester like part # 3808 to check the wires by function when installing a connector. If the connector you need is on the vehicle side and you determine it is a 6-way, I recommend part # PK12720. This is a plastic 6-pole round pin socket that would be...
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  • Troubleshooting 7-Way to 5-Way Adapter Where Stop/Turn Circuits Arent Active
  • First thing you will want to do is use a circuit tester like part # 3808 to test the stop/turn circuits of the 7-way you have on your vehicle. It sounds like maybe those circuits are shorted out and that is why it seems like the adapter # A75TB isn't working properly. If this is the case you will want to check the conditions of the wiring on the back of the 7-way as well as check for and clean any corrosion you find on the 7-way pins. The next step will be to connect the # A75TB to the...
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  • How to Complete the 12 Volt Trailer Wiring Circuit of a 2005 GMC Yukon
  • There is a wire under the hood of your 2005 GMC Yukon that needs to be connected so that the 12 volt accessory circuit is complete on your 7-way. If you check out the help article I attached you will see exactly how to do this. You will also need to install a 40 amp fuse in the fuse box as well to complete the circuit. If you check out the picture I attached you will see a red square over where the fuse will need to be installed into and where the wire gets connected.
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  • How to Bypass the TIPM of a 2006 Dodge Ram and Install a 7-Way Trailer Connector
  • The TIPM of your 2006 Dodge Ram can be frustrating to deal with in terms of trailer wiring. When you short out the TIPM you have to take it to a dealer so that they can reset it, and they will only do this so many times before you have to spend a ton of money to replace it. The best way around the TIPM is to bypass it all together with the trailer wiring. For that you can use the wiring harness part # 119178KIT for a 4-way, and then for converting the 4-way to a 7-way you would want...
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  • How to Connect the Tow Bar Wiring of the Roadmaster Sterling to Trailermate Vehicle Wiring
  • So it sounds like you are using the Trailermate Wiring Kit part # TM780072 as tow bar wiring for your 2015 Chevy Equinox and are looking for a way to convert the 6-way wiring that comes with the Roadmaster Sterling Tow Bar part # RM-576 to match the 4-way. I have a better solution for you, what you will want to do is remove the 6-way end of the tow bar wiring that comes with the Sterling, and then run the wires to a 4-way like the part # HM48030. Then the wiring will plug straight into...
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  • Trailer Wiring Adapter to Convert 7-Way Blade Style Socket for 4-Pole and 5-Pole Flat Connectors
  • We have the adapter you need to convert your 7-way factory trailer connector for use with trailers having 4-pole and 5-pole flat connectors. Hopkins part # 37385 simply plugs in to your 7-way RV-style socket and provides you with both 4- and 5-pole flat sockets. If you'd like to add a mounting bracket to secure your 7-way at the bumper (rather than zip tie it) you can use # 18138 or if you prefer a no-drill option part # TM75476 along with 18138. I recommend using dielectric grease...
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  • Can 2007 Chevy Silverado Battery be Charged Through the 7-Way Trailer Connector
  • I have not heard of this before but in order for that to work the wiring from the vehicle battery to the 7-Way would have to be a direct connection with no fuses, relays or circuit breakers which may or may not be designed for electricity to flow both ways. Also, if the 7-Way 12 volt circuit is wired through the power distribution box and then the battery you run the risk of damaging other electrical components. The other issue is on Chevy and GMC trucks the 12 volt circuit is not always...
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  • Is the 6-Pole Square Trailer Wiring Connector Kit Water Proof
  • I wouldn't say that the 6-Pole Square Trailer Wiring Connector Kit # 37995 is water proof. It is weather resistant. If submerged for long enough water could still get to the pins. That is why we recommend using dielectric grease such as # LT37534 on electrical connections to repel moisture.
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  • Trailer Wiring Harness for 2007 Nissan Frontier XE Without Factory Tow Package
  • For your 2007 Nissan Pathfinder without factory tow package you will need a kit that includes the relays to activate the trailer wiring. You can use TowReady # 118525 that includes the relays and which provides the 4-pole flat connector. This 4-pole will provide stop/turn/running light signals for your trailer. If you wish to add a 7-way socket for flexibility you can add Hopkins part # 37185. This is a combination 4-pole and 7-way RV-style socket that simply plugs in to the 4-pole from...
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  • Mounting Hole Dimensions of the Pollak 6-Pole # PK11609
  • I pulled a Pollak 6-Pole # PK11609 from our warehouse and found that the mounting holes are 2-3/4 inches apart and the diameter of the tube on the back of the connector is 1 inch.
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  • 2011 VW Touareg 5-Way Trailer Wiring Recommendation
  • It sounds like your 2011 Volkswagen Touareg doesn't have any trailer wiring and you are looking for the correct part to install a 5-way on it. We have exactly what you need. You would want the Tow Ready Wiring Harness part # 119177KIT. This comes with everything needed to install a fully functional 5-way trailer harness on your vehicle. You can also plug a 4-way into this 5-way. I attached a set of installation instructions for you to check out as well.
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  • Electric Trailer Brakes Make Noise But Will Not Engage
  • The first thing you will want to check is the output voltage on the brake controller. If it is set too low it will not send enough power back to engage the trailer brakes. For testing purposes it is easiest to set it to full power. Using a meter or circuit tester like # 40376 make sure that power is getting back to the trailer connector, which it does sound like it is. Then with the trailer connected make sure power is getting to the brake magnets which again it sounds like it is. That...
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  • What Circuit on a 7-Way Should be Used for a 12 Volt Power Circuit
  • The purple wire of a 7-way is traditionally used for reverse lights and is the center pin of the connector. If you are looking for a 12 volt circuit to use with a toggle switch you would want to use the circuit in the 1:00 position as this is traditionally the 12 volt power circuit. I attached a diagram for a 7-way plus a help article on trailer wiring for you to check out as well.
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  • Trailer Wiring Harness for a 2008 Freightliner Sprinter
  • For your 2008 Frieghtliner Sprinter you have a few trailer wiring harness options. You can use Curt harness # 56146KIT, Tow Ready harness # 119179KIT (replaced 119176), Tow Ready harness # 119147KIT (rated higher for tail light amperage draw), or Hopkins harness # 46255. All of these harnesses are going to install the same way. I recommend # 119147KIT though because it is rated for more amperage on the tail lights (7.1) and because the Tow Ready harnesses tend to have less issues than...
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  • Is Hopkins # HM47065 7-Way to 4-Pole Adapter Compatible with 2015 Toyota Tacoma
  • The Hopkins # HM47065 is not a vehicle specific item, it will work in the 7-way of any vehicle and allow a trailer or flat towed vehicle with a 4-pole flat connector to receive lighting signals from the tow vehicle. The # HM47065 would typically be used for flat towing a vehicle, while an adapter like part # PK12716 would usually be used for a trailer. If you'd care to see a product description video featuring the Hopkins Adapter, please click the provided link.
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  • Brake Lights Not Working on 2014 Chevrolet Equinox Being Towed by Semi Road Tractor
  • Since your 2014 Chevrolet Equinox has a combined wiring system, which means brake and turn signals are sent along the same wire, you will need to use the Upgraded Circuit Protected Taillight Converter, # 119178, in order for your brake lights to function. You will want to use a connector like the Pollak HD 7-Pole Round Pin Connector w/Cable Guard, # PK11702, and wire in taillight converter, # 119178, to match the functions of the 7-way on your semi. I have included a diagram that shows...
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  • Best Location to Wire a Tail Light Isolating Diode System
  • The diodes in the Roadmaster 6-diode wiring kit # 154-792-118158 will be installed after the converter # 118158 (included in the Roadmaster 6-diode wiring kit) when using this kit. The easiest place to install the diodes is right behind the tail light assemblies where the wiring is easily accessible. I included a couple helpful articles, video review and a picture for you to view.
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  • Can Power Wire of Powered Trailer Taillight Converter Be Plugged into 12-Volt Outlet in Vehicle
  • The trailer wiring harness manufacturers design the powered converters so that the draw their 12-volt power directly from the vehicle battery for a very good reason. Doing so keeps the vehicle wiring fully isolated from the wiring of the trailer. Short circuits in trailer wiring are very common, keeping the trailer wiring isolated from the vehicle will help prevent the wiring in your Passat from being damaged if a short circuit occurs in the wiring on the trailer. Trailer wiring is easy...
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  • Looking for Trailer Wiring Harness with 7-Way and 4-Pole that Can Be Used At the Same Time
  • The Pilot Automotive # TC-701 only has one connector that can be used with either a 4 pole or 5 pole flat trailer connector, so it wouldn't work for what you're wanting to do. Your best solution would be to remove your existing 7-way, install a pigtail like part # PK11998 which will allow you to plug in a 7-way that has an integrated 4-pole like part # HM40920. The color coding on the pigtail is a little different from what's usually used. The product description page for the pigtail...
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  • Installing 7-way Connector on 2003 Ford Explorer with Factory Tow Package
  • If you'll follow the wiring from your 4 pole trailer connector back under the vehicle, you'll find it plugs into a connector on the driver's side frame rail. Just past where it plugs in, remove the tape or wire loom from the wiring harness. You should see an orange (or red) and a dark blue wire. The orange wire carries a trailer power circuit from the battery, and the blue wire connects to where you plugged the controller in to carry the braking voltage to the trailer brakes. You'll...
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  • Trailer Wiring Recommendation for a 2014 Chevy Camaro With LED Taillights
  • Yes, I just got off the phone with my contact at Tow Ready and he informed me that the Tow Ready wiring harness part # 119147KIT that you referenced has been confirmed to fit your 2014 Chevy Camaro with LED taillights. I attached installation instructions and an install video for this harness for you to check out as well.
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  • Does the Curt Wiring Kit # 56146KIT Include a 7-Way Flat Connector
  • The Curt wiring kit # 56146KIT will include a protected tail light converter, wiring, circuit tester, quick splice connectors and a 4 pole cover. It will not come with a round 7-way flat. The one I recommend is the Hopkins 4-pole to 7-pole and 4-pole adapter # 37185. Therefore, the 4 pin connector from the Curt wiring kit # 56146KIT will plug into the Hopkins adapter # 37185 to provide light functions on the 7-way socket. If you plan on installing a 7-way to add 12 volt power or electric...
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  • Length of Hopkins Endurance Flex-Coil 7-Way to 6-Way Trailer Connector Adapter Nite-Glow # HM47053
  • I went to the warehouse to measure the Hopkins Endurance Flex-Coil Trailer Connector Adapter w/ Nite-Glow, # HM47053, and when stretched, the adapter does indeed measure 8' from the end of the 7-way to the end of the 6-pole connector. 8' is the longest 7-way to 6-pole adapter that we offer.
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  • Left Blinker Flashes Fast After Installing Trailer Wiring Harness on a 2014 Chevy Camaro
  • In order to determine the functions of the wires on your 2014 Chevy Camaro you will need to use the included circuit tester that came with # 119147KIT. What you are describing sounds like hyperflashing which can happen when using LED lights but usually not stock LED lights on a vehicle. If the issue is happening on a trailer then the hyperflashing is a result of not enough load on the system. Installing a load resistor such as # P230004A in line of the affected circuit would cause more...
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  • How to Install the Tow Ready Wiring Kit part # 119190KIT in a 2014 BMW X3
  • Yes, I attached a link to the installation instructions for the Wiring Kit part # 119190KIT. I also attached a link to a video that shows this product being installed on a very similar BMW X3 as yours. The written instructions will be somewhat generic, but the video will be much more specific to your vehicle.
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  • Recommended Trailer Wiring Harness for 2003 Toyota Tacoma
  • To provide a trailer wiring harness for your 2003 Toyota Tacoma, you'd need the Draw-Tite taillight converter, part # 118379. The wiring harness would plug inline between the taillight assemblies and the vehicle wiring harness, providing a plug and play connection that won't require any cutting or splicing. I've linked you to an install video and the installation instructions.
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  • 15 Amp Male Connector to 50 Amp Female Connector Recommendation
  • For an adapter that has just the 50 amp female connector plus a 15 amp make connector you would want the part # CAM55168. This would be what you would want to use while at your house without access to a 30 amp power source. The part # CAM55025 would be used only if you have access to both a 30 amp and 15 amp source.
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  • Parts Needed to Make a Taillight Signal Converter to Go From 6-Way Separate to 4-Way Combined
  • Since your tow vehicle has separate turn signals and it sounds like your trailer has combined signals you will need to use an converter like the # RM-732. Sounds like your trailer has a 4-way on it and your trike has a round 6-way, so to make an adapter you will need a part # C58044 and a # PK11604 as well. You will want to determine the pin outs of the 6-way of your trike so you know how to wire up the # PK11604. Use a circuit tester like part # 3808 for this. You will want to wire...
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  • Brake Controller and Wiring Recommendation for a 2008 Ford Explorer Towing Trailer with 6-Way
  • The part # 37175 could be used to adapt your 4-way to a 6-way, but you will be required to track down several other components so that you can make the connector functional and to install a brake controller. A better product to get would be the part # ETBC6 as it comes with everything needed to convert the 4-way to a 6-way and wire up a brake controller. I attached a link to install instructions plus an install video for you to check out. I also attached a picture that has a diagram...
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  • What is the Outside Diameter of the Hopkins Molded Trailer Wire Connector Part H20046
  • I went to our warehouse to get the Hopkins trailer wire connector # H20046 to provide you the measurement you requested. The outside diameter is 0.61 inches using a digital caliper. A rubber grommet you should take a look at is the Optronics flush mount rubber grommet # A11GB. I went to our warehouse again to measure the inner and outer diameter. The inside diameter is 0.61 inches but can stretch to 0.74 inches. I think this would be perfect for what you are needing. The outside diameter...
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  • Why Does 6-Way Trailer Connector Tester Only Have 5 LED Indicators
  • In either case, a 6-Way or 7-Way, there is no light for the ground pin, only the circuits that receive power. The ground completes the circuit so there wouldn't be power on it to light up a light. LED lights use much, much less power than incandescent lights. So little in fact that even a tiny amount of current (amperage) will light an LED light. And the LEDs on testers like # TR20116 are so small they would use even less power compared to an LED trailer light. So it would not take much...
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  • Replacement 7-Way Trailer Connector Recommendation for a 2014 Audi Q7
  • The Pollak 7-Way part # PK11893 that you referenced has been confirmed to fit your 2014 Audi Q7 so I would recommend it for you. It will connect right up to the harness that is on your vehicle. Check out the picture I attached to see the dimensions of the harness and the install bolt hole pattern. If you wanted harness that comes with a 4-way as well you would want the part # HM40975.
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  • Factory 7-Way Replacement Recommendation for a 2014 Ford F Series Super Duty Truck
  • The truck manufacturers all decided to start using the same 7-way wiring harness connectors in the early 2000's, so the # PK11893 will fit all of them. I attached a picture that shows what the round connector looks like that the 7-way is designed to fit. As long as your 2014 Ford F Series Super Duty has/had a factory 7-way installed on it, or the connector is present, the part # PK11893 will be the correct part to use.
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  • Towing a Trailer With LED Lights with a 2013 Volkswagen Tiguan
  • If your vehicle has a trailer connector already, in this case a 7-Way, and the trailer uses a 4-Way flat connector, then you would only need to use a 7- to 4-Way adapter such as # TR20141 mentioned in the answer you have referenced. If your 2013 Volkswagen Tiguan does not have any trailer connector on it then you would have to install wiring harness # 119190KIT to add a 4-Way. It will work with LED lights on the trailer as well as incandescent lights so switching to LED lights will not...
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  • Installing 7-Way Trailer Connector on 2001 Winnebago
  • From what you describe, your trailer connector isn't converted. Most trailers use the same bulb for brake lamps and turn signals, so the signals for the right turn and brake lamp are combined onto one circuit, and left turn/brake lamp are combined onto another. I wouldn't use the 47435 adapter, I have a better solution for you. For starters, I'm assuming your trailer lamps operate as I mentioned above. If that's the case, you'll need to install a converter like # 119178KIT on the circuits...
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  • Recommended Trailer Hitch Wiring for a 2010 Mazda 3 Towing a Small Trailer
  • If you have the 2010 Mazda 3 with Grand Touring LED tail lights package, then I recommend the Tow Ready wiring part # 119179KIT. It will have built-in short circuit protection and eliminate draw on the tail light circuit. The kit # 119179KIT will include a wiring harness, install kit, circuit tester, quick splice wiring connectors and a integrated 4-pole cover. On the other hand, if your 2010 Mazda 3 doesn't have the Grand Touring LED tail lights package, then go with the Tow Ready...
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  • Installing Trailer Wiring Harness on 2009 Lexus RX350 with Factory Tow Package
  • If you are using harness # 18002 then you would ground the white wire to a clean, bare metal surface. The white is the ground for the harness. The wires that you are tapping into on the vehicle will use that ground and it should still work. It is possible that the ground on the factory harness is tucked up further towards the front of the vehicle for some reason so you will want to cut back the covering/loom to see if there are more wires. The ground may not be white on the vehicle harness....
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  • Troubleshooting Trailer that Right Turn Signal Comes On But Won't Blink
  • First you will want to check the right turn signal of the vehicle wiring connector to make determine where the problem is. It's either the tow vehicle or the trailer. You will want to use a circuit tester like part # 3808 to check the pin on your connector for intermittent voltage when the blinker is applied. If the voltage of the vehicle checks out like it should then I would suspect the problem is either that the light assembly isn't grounding properly or it is shorting out to the...
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  • Trailer Hitch Recommendation for 2015 Kia Sorento LX AWD V6
  • I'd Recommend the Hidden Hitch Class III, part # 87634. The hitch has a 3500 lb towing/525 lb tongue weight capacity, which might be limited by the capacity of the vehicle if it's less. The hitch would work well as an attachment point for a hitch mounted accessory like a bike rack or a cargo carrier, or for towing purposes. If you'll be towing with the hitch, you might be interested in the following accessories: Trailer Wiring Harness, part # 118269 for vehicles with the tow package...
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  • Installing 7-Way Trailer Plug on Trailer with Electric Brakes
  • I recommend the Hopkins 7-way molded trailer wire connector # H20044. It will measure 6-feet long and provide you the functions required for your electric brakes. If you prefer an 11 foot 7-Way molded connector, the Hopkins # HM20248 will work great. Please note that the color codes on these molded connectors are different from those usually found on a trailer. The wiring code is on each of the product pages for the # H20044 and # HM20248. If you don't have some already, I highly recommend...
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  • Wiring A 3rd Brake Light On A Truck Cap On A 2002 Chevrolet S-10
  • You have a couple of places you can look for the center high mount stop light (CHMSL) circuit on your 2002 Chevrolet S-10. First, if you have a trailer connector at the back of your S-10 you can check beneath the truck where the trailer wiring runs underneath. You can use a circuit tester like part # 3808 to determine if any of the wires in the loom are dedicated brake light wires. It would only show current when the brake pedal is pressed. If you have a wire bundle or trailer wiring...
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  • Troubleshooting Wiring for a 1998 Ranger Trailer 7-Pin Round to 4-Flat on a 2011 Chevy Tahoe
  • There are a couple of potential issues as to why your turn/brake lights aren't working. First you will need to determine where the problem is coming from and to do that test the vehicle side of your trailer connector. Use a 12V circuit tester like # 3808 to check the function at your 4-way plug such as # HM48110. Having a friend sit in your 2011 Chevy Tahoe to engage each function while you test. If functions are good, test the 1998 Ranger trailer because your 4-way will be okay. If...
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  • Wiring a Truck Bed Camper Shell Brake Light on a 2007 Ford F-150
  • To wire a brake light only on a truck bed topper/camper shell you will need a dedicated brake light only circuit. Tow package wiring would not work because the brake light circuit and turn signal circuits are together. So you would either need to find a wire under the truck that is dedicated brake light only or you would need to tap into the CHMSL (center high mount stop lamp) circuit. Check the owners manual to see if the CHMSL is fused by itself or if the fuse handles other functions...
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  • Adapter to Convert 6-Pin Flat Trailer Connector to 7-Way
  • I'm not familiar with a 6 pin flat trailer connector. What you describe might have been a proprietary connector Ford used on the F53 chassis for their factory 7-way to plug into. Unfortunately, unless you can locate the OEM 7-way that would have the 6 pin plug on the other end, you'll need to do some splicing. I'd recommend you begin by using a circuit tester like part # 40376 to confirm that what you've found is indeed a trailer connector. Activate each lighting function and test...
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  • Parts Needed to Adapt 4 Way Pin Connector to 7 Way on 2013 Honda Odyssey
  • Yes, you can use the Tow Ready Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector, # 30717, to add a 7 Way connection to the back of your 2013 Honda Odyssey. After plugging in the 4 way connector you will have three remaining wires and a white ground wire. You will to attach the ground to a clean, dirt-free part of the vehicle frame. The black wire would be used to connect to the battery for 12 volt power. You connect it with a fuse or an in-line breaker like # # 9510. The yellow...
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  • Installation Of 4-Pole to 7-Pole On 2006 Ford Expedition
  • I recommend using the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole, part # 37185 for your 2006 Ford Expedition. I have attached a photo of the adapter that shows the wires and what they are used for you can check out. You can find the wires you need to connect the adapter to on the driver's side frame rail as shown in the photos I have attached. I have also attached a helpful article that explains how to complete the installation. I recommend using a circuit tester like part # 3808 to...
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  • Will Hopkins Multi-Tow Trailer Connector Adapter Work with In-Bed 7-Way in a 2015 Ford F-250
  • The 7-Way in the bed of your 2015 Ford F-250 is a standard 7-Way so the Hopkins Multi-Tow Trailer Connector Adapter # HM47675 will work with it. I have included a link to a video review of this adapter for you.
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  • Adapter Needed for 2006 Mercedes A170 Pulling a Trailer with LED Taillights
  • In order to combat the load resistance issues that you are experiencing when towing a trailer with LED taillights, I suggest using a trailer adapter on your 2006 Mercedes A170. If your trailer has the round 7-way connector use part # 20142 and if it has a 4-way use # TR20141.
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  • Troubleshooting 4-Way Harness On 2013 Ford F-150 And Trailer Wiring
  • If you installed the 4-way connector at the back of your 2013 Ford F-150, you can check the connector first to make sure it is wired correctly. I recommend using a circuit tester like part # 3808 and check each pin for function. You want to make sure the pin connected to the yellow wire shows current for your left turn and brakes, green is for right turn and brakes, brown is for the tail lights, and the white wire is the ground which should be secured to a clean, bare metal surface. You...
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  • Curt # C56190 Taillight Converter for 2013 Audi Q5
  • I'm not sure which video you're speaking of, but I've confirmed with Curt that the # C56190 is indeed the correct taillight converter for your 2013 Q5. The # 55151 wiring kit is also needed to make the fused connection at the battery. I've provided you with a diagram showing an install diagram. There should be 5 wires exiting the 'input' side of the converter, a white ground wire, brown for running lights, yellow for left turn, red for brake light, green for right turn and black to the...
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  • Trailer Hitch and Wiring Recommendation for a 2015 Kia Sorento 4 Cylinder
  • The trailer wiring kit part # 56146KIT is the correct wiring kit for your 2015 Kia Sorento with a 4 cylinder engine. The 6 cylinder engine models with the tow package can use the custom fit kit part # C56151 instead. The correct hitch would be the Curt Hitch part # C13152. I attached an install video for you to check out as well. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2...
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  • Mounting Bracket Recommendation for Use with 4-Way to 7-Way Adapter part # 37185
  • The correct bracket to use for the 7-Way Adapter part # 37185 is the Mounting Bracket part # 18138. This comes with the bracket and the mounting screws.
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  • 7-Way Trailer Connector for a Truck that has a 4-Way Flat Connector
  • Are you sure it is a 6-Way and not a 7-Way blade style such as # 37185? The center counts as a pin. I have not heard of a 6-Way blade style connector, not to say that it doesn't exist but I haven't seen one myself. There might also be a way to add a 7-Way to the truck without having to cut or splice anything. If you can tell me the year, make, and model of the truck I can determine if there is a 7-Way that will work other than a hardwire option.
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  • Replacement OEM 7-Way Trailer Connector for 2008 Honda Ridgeline
  • I believe the 7-way on your Ridgeline plugs into a US car connector. You can check this by unplugging the damaged 7-way connector from the wiring harness that plugs into the back of it, and comparing what the connector looks like, compared to the left-hand panel in the photo I've provided for you. If they match, you can use the # HM40975 as a replacement for your 7-way. We don't have the OEM Honda part, but this connector will provide you with a functional 4-pole, as well as the 7-way....
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  • No 12 Volt Power to Trailer Connector on a 2002 Chevy Silverado
  • This is not an uncommon situation for your generation of Chevy Silverado. If you remove the cover on the power distribution box, look for a row of larger fuses on the left side of the box (if facing the motor from the front of the truck). If there is no fuse or a blown fuse in the slot closest to the front of the truck in that row then you will need to install a new 40 amp fuse. If there is no wire attached to the post nearest that fuse location you will have to manually run a wire from...
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  • Low Beam Headlight Not Working But High Beam Does Work
  • It sounds like there could be a fuse blown or damage or corrosion in the bulb socket. Bulbs that have both high and low beam functions have 2 filaments in them so it is also possible that the low beam filament has burned out. If you can tell me the year, make, and model of the vehicle I can recommend some replacement bulbs.
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  • Trailer Connector Adapter To Convert 4-Pole on Vehicle to Tow 7-Way Equipped Trailer
  • We do indeed have an adapter that would work for you, the part # 37185 you referenced. This adapter would plug into the 4-pole on your truck. There are four loose wires as well, but if you don't need the 12-volt power or brake output circuit active, you'll just need to ground the white wire to the truck frame. You can bundle up the remaining wires and tuck them up out of the way. The adapter will also provide you a functioning 4-pole. To see a product demonstration video featuring the...
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  • Installing New 7-Way Harness On Camping Trailer With Electric Brakes
  • I have attached a helpful article that explains trailer wiring. You are correct that most diagrams do list the Yellow wire for the left turn and green for the right turn wiring. Since you are re-wiring the entire trailer you can easily make sure you run the wires to match your 2011 ford Explorer wiring. You can test your Explorer wiring by using a circuit tester like part # 3808. Test each pin for function and not by color. Then match the pins on your trailer connector to the mating...
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  • Recommended Coiled Adapter To Connect 7-Way Round On Motorhome To 4-Way On 2014 Jeep
  • We do have the coiled adapter you need. It is the Wesbar Coiled Adapter, part # 787196. This adapter will connect to the 7-way on your motorhome and you can plug the 4-way flat connector on the front of your Jeep into the other end. This coiled adapter is 8 ft long, which should be plenty for you.
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  • How to Wire a Replacement 7-Way for a Gooseneck Trailer
  • 7-Way connectors like the # A7WCB that you referenced should be wired by function and not color. Since trailer manufacturers can sometimes use non-standard color wires for the taillight functions of their trailer it is best just to determine the function of each wire from your trailer's wiring and then wire it by function to the 7-way you end up getting. What you can do to determine the function of each wire is use a 12 volt battery like a car battery and run a jumper wire from the positive...
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  • Troubleshooting Brake Light/Left Turn Signal on a Trailer Towed by 1999 Chevrolet Silverado
  • The first thing I would test is the trailer connector on your 1999 Chevrolet Silverado using a circuit tester like part # 3808 to see if the problem lies in the trailer or in your vehicle. See the linked video to see how to do this. You will be testing for brake/stop light functionality of the circuit and this will tell you if the problem is on the truck or the trailer. Also to ensure that your trailer connector is wired properly, we recommend using the circuit tester to match pins by function....
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  • Part Recommendations For Flat-Towing A 2006 Hummer H3
  • In order to be able to flat-tow your 2006 Hummer H3, there are 5 items needed. You will need base plates for the Hummer, a tow bar, safety cables, lighting for the H3, and most states now require a supplemental brake system. The base plates I recommend are the Roadmaster Base Plates, part # 2505-3. When the front arms are removed the system is virtually invisible. The tow bar I recommend is the Roadmaster Falcon 2 Tow Bar, part # RM-520. This tow bar has a weight capacity of 6,000...
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  • Suggested Frame Clips to Secure Rubber Brake Lines on Saltwater Boat Trailer
  • If your boat trailer has a frame design that will directly accept the clip-in-place Redline # 464600 frame clips then this will be your easiest installation. We do also offer 1/2-inch metal loom clamp # A0500 from Redline that has plated steel construction and a rubber sleeve to prevent friction damage to the wire or tubing secured in it. The enamel-finish clips # 464600 could still be spray-painted with an additional coating of paint for extra protection from corrosion, and this could...
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  • 2011 Range Rover Sport Towing a Trailer with LED lighting
  • The Tow-Ready trailer connector adapter # 20142 you referenced is designed to work on a range of European import vehicles. This adapter will prevent low current draw on your LED trailer lighting from triggering error messages on your Range Rover Sport dashboard display. Before installing this adapter it is suggested that you check that your trailer connector's contacts are clean and free or dirt or corrosion. You might also want to apply dielectric grease like # LT37534. I included...
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  • Recommended 7 Way to 4 Way Adapter for a 2015 Volkswagen Tiguan Towing a Trailer with LED Lights
  • The 7-way to 4-way adapter you need is the Tow Ready # TR20141. It will work with your 2015 Volkswagen Tiguan towing a trailer equipped with LED lighting. The Tow Ready adapter # TR20141 has built-in load resistors to simulate more load so your 2015 Tiguan does not give the bulb out sensor error. I included a video review for you too.
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  • How To Wire Replacement 7-Way Connector On 2004 Chevrolet Suburban
  • I have attached a photo of the layout for a standard 7-way connector you can check out. This should be the same layout as the plug you are replacing on your 2004 Chevrolet Suburban. If you had an aftermarket 7-way plug installed you may need to use a circuit tester like part # 3808 to check the wire functions and make sure they are connected as shown in the attached photo.
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  • Brake Controller Does Not Work when Using 7-Pole Round to 7-Pole Blade Adapter
  • It does sound like something is mismatched in the wiring. Either the truck or the trailer would appear to not be following the standard pin out. On the output side of adapter # HM47425 the brake pin is in the 5 oclock position if looking at the pins. If looking at the back of it where the wires attach it would be in the 7 oclock position. I have included a link to a help article that shows how different trailer connectors are normally pinned out so you can compare them with what you...
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  • How to Install 119179KIT on 2012 Lincoln MKZ
  • I don't have specific written instructions for the # 119179KIT to get installed on your 2012 Lincoln MKZ, but I can do you one better. I attached a video that details every aspect of the install process of this wiring harness on a very similar MKZ as yours.
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  • 20 Amp Power Inlet Recommendation for an RV
  • Yes, the # 14150 that you referenced is a 20 amp power inlet that works with any standard 20 amp extension cord so it would work well for you.
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  • Troubleshooting 7-Way on 2001 Chevy Silverado that Stops Functioning When Headlights 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. I suspect that there is corrosion on the ground pin of the connector and cleaning it with fine grit sandpaper will fix it.
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  • 6-Way Vehicle to 7-Way Trailer Adapter Recommendation
  • We have exactly what you need. It sounds like you have a 6-way round connector on your 1999 Ford F-250 and need to tow a trailer with a 7-way blade connector. All you need is the adapter part # 47435. Check out the review video. The # HM47083 that you referenced is the opposite adapter you would need. It would be for if the vehicle had a 7-way and the trailer had a 6-way.
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  • Is Optronics 7 Pole to 5 Pole Flat Wired Adapter Waterproof
  • For something to be considered waterproof it has to be able to be submerged under water for a certain amount of time and not let any water in. Based on that the Optronics adapter # A57WB is not technically waterproof. But at the same time you should unplug the trailer from the tow vehicle prior to submerging the trailer in the water so as to eliminate any chance of a short caused by water. Using dielectric grease, # 11755, on the trailer connectors/adapter will repel moisture and would...
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  • 4-Pole Flat Trailer Wiring Harness for 2003 Nissan Xterra Without Factory Harness
  • We can help you! We do offer several options in 4-pole trailer wiring harnesses to fit your 2003 Nissan Xterra that did not come from the factory with one in place. All can be seen on the link provided. The Curt # 56146KIT is a good choice for its high current capacity. Each will require a bit of wire splicing and I have linked a video showing harness installation in a different Nissan vehicle. No matter which harness you choose the installation process will be essentially identical....
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  • Brake Lights on 2012 Semi Trailer Work But Not Brake Lights on 2004 Freightliner
  • Since your semi trailer brake lights are working but the tractor's brake lights are not working, it sounds like the wiring for the trailer lighting is independent of the tractor's brake lights. If all of the trailer lights operate as they are supposed to then I would first check the fuse panel in the tractor for a blown brake light fuse or perhaps for corrosion in the fuse holder. You can also check the individual brake lights on the tractor for signs of a weak ground connection (especially...
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  • Blinkers Do Not Work with Running Lights On on a 2007 Freightliner XL Classic
  • You will first need to make sure that the new tail lights are wired the same as the old ones. There are basically 2 types of wiring systems. First there is a 2-wire system that has combined turn signals and brake lights on the same circuit/bulb. And there is a 3-wire system that has separate circuits/wires and bulbs for turn signals and brake lights. On many tail lights the functions of the wires is listed on the back of the assembly. Since there isn't a standard wire color/function code...
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