Select Your Vehicle

View Cart


Filter Questions and Answers:


reset filter

Expert Answers about Wiring


  • Trailer Running Lights Not Working when Connected to 4-Way on 4 and 7-Way Trailer Connector
  • The trailer connector you are using on the vehicle needs to be grounded and the connector on the trailer has to be grounded as well. All of the lights also need to be grounded. This does sound 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...
    view full answer...

  • Recommended Converter To Convert Combined Wiring On Vehicle For Trailer With Separate Wiring
  • We do have a converter that will let you convert the combined brake and turn signals from your Honda without splicing into the vehicle wiring. The wiring would be done on your trailer. I recommend part # 118158. You would cut the harness on your trailer and wire it to the 118158 converter as shown in the attached photo. Since it is not waterproof, you will need to use a junction box on the trailer like part # 38656. You would need to use a 4-way trailer-side connector like part...
    view full answer...

  • Troubleshooting Trailer Wiring that Doesn't Function After Install on 1987 Nissan Truck
  • 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...
    view full answer...

  • 7-Way Recommendation for a 2009 Ford Escape
  • It sounds like you are referring to a 7-way trailer connector as that style of connector has a flap that covers the opening of the connector when not in use and is very common on trucks. To convert your 4-way to a 7-way all you would need part # 37185.
    view full answer...

  • Trailer Wiring Recommendation for a 2015 Honda Fit
  • For trailer wiring for your 2015 Honda Fit you would need the Tow Ready harness part # 119190KIT. This is a universal install harness that will require you to test the functions of your taillight wiring and then splice some wiring to it. I attached a link to the install instructions plus an install video that shows this harness being installed on a similar video to give you an idea what is involved.
    view full answer...

  • Recommended Trailer Wiring for 2013 Audi S5 Convertible
  • Curt hasn't tested a wiring harness on your vehicle, so they couldn't make a recommendation between the two. The correct harness will depend on what kind of wiring system your S5 uses. You'll need to use a circuit tester like part # 40376 on the circuits feeding the taillight assemblies to determine whether your vehicle uses a 3 wire or a Pulse Width Modulation (PWM) system. If you discover that the running light, turn signals and brake lamps are all carried on different circuits, you...
    view full answer...

  • Recommended Replacement 4-Pole Wishbone Trailer Wiring Harness
  • It sounds like your trailer has a special type of 4-pole connector called a wishbone harness, such as 20-foot # A20WB or 35-foot # A35W42B. These wishbone harnesses simply use two brown running light wires to make it easier to wire your trailer's lights. The dual wires mean there is no need to run a jumper wire from one side of the trailer to the other; one wire runs down each side of the trailer frame. You can use butt connectors like # 05731-5 which you can wrap in electrical tape...
    view full answer...

  • Options for Converting Factory 4-Way to 7-Way on 2014 Ford F-150
  • The Curt Adapter, # C57674, is exactly what you will need to add a 7-way to your 2014 Ford F-150. Installation will be fairly simple, just connect the 4-way on the adapter to the 4-way on your truck and then connect the remaining wires to the corresponding wires on the back of the factory plug. Unfortunately a 7-way connector that will plug directly into the vehicle wiring is not available.
    view full answer...

  • Replacement 7-Way Recommendation for a Vehicle 7-Way that Filled with Water and Rusted
  • If the connector portion of the # HM40975-11998 filled up with water it had to have been due to it getting submerged or being installed in an area that gets direct water sprayed on it when traveling in rain. We have never heard of one filling with water like you described. You would want to either replace the whole thing or just the connectors with part # HM40975. If it's as rusty as you described it would be very difficult to get it all out. But you could try the product called CLR...
    view full answer...

  • Adapter for Connecting 30 Amp Camper to 50 Amp Campsite Power Source
  • Yes, the # 09554 would be exactly what you need. The 30 amp service of the RV is just how much it can pull. You can still connect to a 50 amp service at a camp grounds shore power connection and it will still only pull as much as it is able. If it tried to pull over 30 amps of course it would cause it to trip breakers/blow fuses.
    view full answer...

  • Trailer Right Side Running Not Work, All Other Trailer Lights Work
  • If you are not getting power on the running light circuit at the connector on the truck then none of the running lights should be working on the trailer. Trailer's in the US use one circuit for running lights, one circuit for left turn/brake lights, and one for right turn/brake lights. So if just the right side running light is not working then it is likely a bad ground or wiring issue somewhere on the trailer. Ground problems normally show up when there is more draw on a system such...
    view full answer...

  • Hardwire Powered Trailer Wiring Harness for a Ford Ranger
  • You could use Curt wiring harness # 56146 on a vehicle that has a combined wiring system but you would need additional parts for this harness to complete the installation. Specifically you would need installation kit # 55151. Or both of them together are part # 56146KIT. The Tow Ready kit, # 119190KIT, comes with all of the accessories. But really you could go with a more basic Tow Ready harness, # 119179KIT, which is what I recommend since we hear about less issues with the Tow Ready...
    view full answer...

  • Fuse Blows in 2008 Silverado 2500 Trailer Wiring After 10 Miles of Driving
  • If you are blowing your trailer lighting fuses repeatedly then you either have a short in your trailer 4-pole wiring or the total load of all the lights on the trailer is more than the vehicle's circuit can handle. I do not recommend increasing the fuse value above the value indicated; this can cause damage to the vehicle's wiring which can be costly to repair. First, check that the wiring harness on the trailer is free of damage. Check areas where the wires have to make sharp bends...
    view full answer...

  • Bolt Doesn't Want to Thread to Install 7-Way Bracket On a 2011 Nissan Pathfinder
  • It sounds like the existing weldnut on your factory hitch has gotten corroded over time and that is why the 8 mm bolt will not thread into it. This is a very common problem on vehicles that have seen a couple winters or more. I attached the video you referenced and at the 1:47 mark of it our installer shows how to install the bracket. I also attached a couple articles on cleaning weldnuts for you to check out as well.
    view full answer...

  • Trailer Wiring Harness for a 2006 Toyota Sienna
  • For your 2006 Toyota Sienna there is a plug and play wiring harness available, # 118304. This harness just plugs in line with the vehicle tail light wiring. There is no splicing into the vehicle tail light wiring required. With harnesses # 119190KIT and # 119147KIT you would have to cut into the vehicle wiring and you would have to run a power wire to the vehicle battery. The difference between these two kits is that # 119190KIT has the newest version of the converter box. Both are...
    view full answer...

  • Troubleshooting Brake and Turn Signals on Trailer Towed by 2000 Toyota Tundra
  • On the 4-pole trailer wiring harnesses we offer for your 2000 Toyota Tundra, Tow Ready # 118367 and Curt # C55367, the connection point is under the vehicle on the driver's side. There will be a connector to mate with the plug shown in the linked photo. The vehicle connector should carry the brake and turn signals as well as running lights (brown wire) and 12V power (black wire) for the harness. The brake signal is on the harnesses' red wire, right turn on the green wire and left turn on...
    view full answer...

  • Is a 7-Way Round Connector Used to Activate Surge Brakes on Boat Trailer
  • The surge brakes on your boat trailer are going to operate completely independent from the trailer wiring/connector so there isn't a pin on the 7-way that activates the surge brakes. The wiring that your mechanic was speaking of is that used for an actuator with a reverse lockout solenoid, like part # T4715420. In this case you would need to run a wire from the reverse light circuit to the solenoid so that you can reverse your trailer without the actuator activating the brakes of the trailer.
    view full answer...

  • Troubleshooting Brake Magnets On 1992 Fleetwood Prowler Fifth Wheel Trailer
  • When testing each individual electric brake magnet the amperage draw would be 3.2 to 4.0 max amps at 12 to 13 volts on 10 and 12-inch brake magnets. Sounds like you are right there with your tests. Also, it sounds like you are getting the right current with the brake controller when you are testing it with the manual override. I have attached a link to a helpful article that explains how to do a bench test on the brake magnets you can check out. As far as setting the gain all the...
    view full answer...

  • 7-Way and Brake Controller Recommendation for 2006 Dodge Ram that Bypasses TIPM
  • You will need to start with a 4-way. For that you would want the # 119190KIT. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because...
    view full answer...

  • Which Lights will Illuminate on the Tester # I26 When Brakes are Applied
  • When your brake lights are pressed and you are using the # I26 as a tester the two pins opposite of the jacketed (ground) pin will illuminate. These are the left and right turn/brake light circuits.
    view full answer...

  • In-Bed Trailer Connector For Slide In Truck Camper on 2007 Chevy Silverado New Body
  • To install a 7-way in your truck bed, I'd recommend the Hopkins # 41157. This wiring harness would tap inline with the connection between the trailer wiring on the truck and the 7-way trailer connector. For a male connector on the camper with a length of cable, I'd recommend a molded 7-way connector/cable from Hopkins, which is available in various lengths: 3 foot- # H20042 4 foot- # H20043 6 foot- # H20044 8 foot- # H20046 The product page for each of the connector/cables...
    view full answer...

  • Trailer Left Side Brake, Turn Signal, and Running Lights Not Working
  • Since everything is working on the truck side the issue must be on the trailer side. I have included a picture that shows the pin functions of both a vehicle and trailer side 7-Way. You will need to check the configuration on the trailer side to determine if it matches up to what the truck side has. In the pictures though you have to ignore the colors and focus only on the functions. On the vehicle side if you are looking at the pins the left turn signal and brake lights are in the 9...
    view full answer...

  • 2007.5 GMC 3500 Integrated Brake Controller Not Working
  • There are a couple of things you can do to try and troubleshoot your GMC 3500. First I recommend making sure that the emulator you are using is compatible with GM trucks. The emulator that you mentioned # TR20117 works only with Ford OEM brake controllers and Tekonsha and Draw-Tite aftermarket controllers. Some times, the LED lights on the emulators don't have enough draw to fully trigger the brake controller. A circuit tester with an incandescent bulb, like # 40376, will have enough...
    view full answer...

  • Troubleshooting Brake Controller that Stopped Working With Brake Pedal
  • It sounds like you have a bad third brake light (CHMSL), fuse and because of that your brake controller has stopped working. Replacing the fuse should fix the problem and get your controller back going.
    view full answer...

  • Can a 12 Volt Circuit on a Trailer 7-Way Charge a Trailer Battery
  • The 12 volt power circuit of your 7-way would not be able to charge a dead trailer battery, but it can put a light maintenance charge on it so that it stays topped off while you are travelling. The circuit is most likely protected by a 40 amp fuse, but that does not mean that it can provide 40 amps of charging power to your battery. That just means that if something tried to draw more than 40 amps the fuse would pop. For a charger that you could use to charge your battery when it is...
    view full answer...

  • Fuse and Relay Locations for 7-Way Connector 12 Volt Circuit on a 2002 Ford F-350
  • The fuse used for the 12 volt circuit on a 7-Way trailer connector on a 2002 Ford F-350 is the battery charge or trailer battery charge fuse. On your truck it is location 115. There is also a relay for this circuit in location 305.
    view full answer...

  • Single Pole Trailer Wiring Connector for Battery Charge Line for RV
  • If you are looking for a single pole connector to use as a charge line for the batteries of your RV the part numbers # PK11851 and # PK11852 would be a great choice. These connectors can accept wire gauge up to 00.
    view full answer...

  • Can 10 Gauge Wire Be Used for Trailer Brakes if the Magnet Wires are a Smaller Gauge
  • Yes, when it comes to wiring for electric trailer brake magnets you can attach a 10 gauge wire to the smaller brake magnet wire. Ten gauge wire is commonly used in trailer manufacturing for electric brakes even if the short wires from the magnets are smaller.
    view full answer...

  • Will 2014 Hyundai Santa Fe 4-Way Connector Provide Charge to Trailer Battery Through 7-Way Connector
  • Running a 12 volt power circuit on your 2014 Hyundai Santa Fe would allow you to maintain the trailer battery but would not provide a way to charge the battery. As for the 4-way, this will only provide power for the lights and signals on your trailer. In order to actually charge the battery you will want to use a battery charger connected to a 110 outlet.
    view full answer...

  • No Power to 12 Volt Pin on a 2011 Chevy Silverado 7-Way Trailer Connector
  • On many Chevy and GMC trucks there are some connections that need to be made under the hood to make everything fully functional. I have included a link to a help article and in the latter half of it we explain these under-hood connections. the section you will ant to look at is called Finalizing Connections for the Brake Controller. It is also possible that the 12 volt wire is not ran all the way to the back from the front of the truck. If that is the case you would need some wire, #...
    view full answer...

  • Trailer Turn Signal and Brake Lights Not Working but Running Lights Do Work
  • There are some tests you can do to determine where the problem is. I have included a link that explains the testing procedure. You will need a circuit tester such as # 3808 to test the wiring. It could also be 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...
    view full answer...

  • Adding a 4-way Flat Trailer Connector to a Euro Style 7 Pin Connector
  • I believe that the European trailer connectors have separate turn and brake light signals. If the trailer you are planning on towing has a 4 pin flat connector, and has combined lighting, you will want to use a wiring harness that will adapt your separate lighting at your Euro 7-way to combined lighting. A harness like the Tow Ready Upgraded Modulite Circuit Protected Vehicle Wiring Harness # 119179 can be spliced into your current wiring harness and will convert the wiring to combined...
    view full answer...

  • Recommended 4-Pole to 5-Pole Trailer Wiring Adapter for 2013 Ford Explorer
  • You can use Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036 to match up your 2013 Ford Explorer with 4-pole harness to your trailer that uses a 5-pole flat connector. Installation is shown in the linked video.
    view full answer...

  • Toyota Corolla Trailer Harness that Blows Vehicle Fuses
  • You have a short somewhere on your trailer's wiring. A good place to start would be where you saw metal digging into the wiring of the trailer. That's a big red flag for a short. Also, if this is a boat trailer be sure to unplug the trailer wiring before you back the trailer into water. That's an easy way to short out trailer wiring.
    view full answer...

  • Recommended Gauge Wire for Brake Output Circuit on a Trailer
  • 10 gauge wire is actually recommended for use for the brake output circuit on a trailer. You would want our part # 10-1-1 that is 10 gauge wire sold by the foot.
    view full answer...

  • Converting a 5 Pin Trailer Connector on a Motorcycle To a 4-way Flat on Trailer
  • I have a solution for you, however we do not currently carry a vehicle 5-way to a trailer 4-way adapter. In order to connect your motorcycle to your trailer, you will want to create an adapter. To provide your trailer with a 4-way flat connector, you will want to use the Tow Ready Upgraded Circuit Protected Taillight Converter # 119178. The wires that come out of the harness's converter will be connected to a 5-way trailer connector. If the 5 pin on your motorcycle is round, you...
    view full answer...

  • Trailer Wiring Harness for a 2015 Volkswagen Jetta TDI Sedan
  • For your 2015 Volkswagen Jetta TDI sedan we have T-connector wiring harness # 118572. This harness plugs in line with the vehicle tail light wiring so you will not have to splice into the sensitive wiring system of your V-dub. Curt wiring harness # 56146 is not currently listed as a fit for your Jetta. I have included a link to a video showing an example installation of wiring harness # 118572 for you.
    view full answer...

  • What Circuit on Trailer Wiring Power the Interior Lights of a Trailer
  • The lights in your trailer would be either powered by a battery or from the 12 volt accessory circuit of the 7-way. If you didn't connect this circuit and the lights aren't working then you will need to run a length of 10 gauge wire like part # 10-1-1 (sold by the foot), to the 12 volt circuit of your 7-way up to the positive terminal of the battery through a breaker like part # 9510.
    view full answer...

  • Trailer Tow Package Turn Signal Fuse and Relay Locations on a 2010 Ford F-150
  • There is one fuse location and two relay locations you will want to check in the power distribution box in the engine compartment. First, check the 20 amp fuse in location 45. This is the Trailer tow stop turn relay feed. If that checks out fine, then check the left hand stop/turn relay in location 37 and the right hand stop/turn relay in location 38. The best way to test a relay is to replace the existing relays with relays that you know are in good working order. If the fuses and...
    view full answer...

  • Wire Gauge of the Arcon Permanent RV Power Cord # AR14247
  • The wire gauges used in the Arcon Permanent RV Power Cord # AR14247 that you referenced are: Black and white wires: 6 gauge Green wire : 8 gauge
    view full answer...

  • How to Determine Wiring Functions of 7-Way Wires on a Truck
  • I don't know the color codes for your trailer connector so you will need to use a circuit test like part # 3808 to determine the function of each wire, label them, and then wire to the 7-way. Or you can use the chart I attached to see where the functions of each pin on your 7-way should be and then use the previous wiring locations of the 7-way to determine the functions of each wire.
    view full answer...

  • Best Way to Bypass TIPM on 2006 Dodge Ram 2500 Diesel
  • The best way around the TIPM on your 2006 Dodge Ram 2500 is to bypass it using the Tow Ready Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT, and the Universal Installation Kit for Trailer Brake Controller, # ETBC7. The # 119190KIT is a top of the line Modulite harness including circuit protection to safeguard itself and the tow vehicle from harmful electrical shorts. I have attached a help article, as well as installation instructions,...
    view full answer...

  • Does Wiring Harness Installation in 2014 Volkswagen Jetta Sportwagon Void Vehicle Warranty
  • Vehicle warranties fall under the authority of a federal law called the Magnusson-Moss Warranty Act. The act states, in part, that your warranty must still be honored unless the part installed actually caused the malfunction. The Curt wiring harness # 56146KIT that you referenced is a powered trailer taillight harness, just like the Tow Ready # 119179KIT which is the harness recommended for your 2014 Volkswagen Jetta SportWagen. Both of these are hardwired installations that require...
    view full answer...

  • Trailer Lights Go Out When Using Brake Lights and Turn Signals or Running Lights at the Same Time
  • This sounds like a ground issue or a potential overload situation. 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. And overload could be the result of a short or too many lights on a trailer. 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...
    view full answer...

  • Troubleshooting Trailer Wiring that Stopped Working on 2013 Ford Escape, Fuse is Good
  • It is possible that you shorted out the converter box of the trailer wiring on your 2013 Ford Escape. You will need to test the wires going into the box and then see if there is the correct output on the output wires of the box. If there isn't voltage going into the box then the connections are at fault. If there isn't voltage coming out of the box then either the fuse is blown or the box is shorted. Check out the video I attached to see more info on testing the box. For a replacement...
    view full answer...

  • Troubleshooting Bulb Out Sensor After Using Bulb Out Adapter TR20141
  • Are all of the taillights on your trailer working properly? You may try verifying that all of the taillights are in good working order by running a jumper wire of 12 volts from a vehicle battery to all of the terminals of the trailer connector to verify that everything is working properly. This may seem like a silly question, but are all of the taillights on your vehicle working properly? If not, the error message would be because of that.
    view full answer...

  • Troubleshooting Trailer Running Light Circuit Not Functioning When Ground is Good
  • Have you tested the running light circuit of the trailer wiring on your vehicle to make sure that the problem isn't on the vehicle side of the equation. Use a circuit tester like part # 3808 to do this. I attached a video that shows how to do this as well. Most likely you have a blown fuse on your tow vehicle for the trailer wiring running light circuit. You can also check the connectors on both vehicles for corrosion and clean as necessary. It could also be that you have too many...
    view full answer...

  • Troubleshooting Trailer Brake and Signal Light Not Functioning on a Travel Trailer
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
    view full answer...

  • How to Determine Trailer Wiring Color Functions on a Trailer
  • Your vehicle sounds like it is wired to the standard 4-way wiring color codes. The white is ground, brown is running lights, the green is right turn/stop, and the yellow is left turn/stop. The only way to know for sure what the wires of your trailer are for is to use a jumper wire to run 12 volts to each of the circuits to determine their function. Most likely the two reds are the two running light circuit wires that run to each side of the trailer, this is referred to as a wishbone...
    view full answer...

  • Trailer Running Lights Not Working when Connected to a 2002 Chevy S-10
  • You can determine if the issue is on your 2002 Chevy S-10 by checking its trailer connector with a circuit tester such as # 3808. Have someone sit in the truck and turn on the running lights while you test the pins on the connector. If you are not getting any power on the running light pin then that does indicate a problem on the truck side. If the trailer connector on the truck is factory installed then it could be a fuse. Use the truck owner's manual to find the fuse locations. Be...
    view full answer...

  • Trailer Brake Lights and Turn Signals Work But Running Lights Do Not
  • Yes it could still be a ground problem when one lighting function is not working on a trailer. The brake lights and turn signals are on the same circuits, one for each side of the trailer, and the running lights have their own circuit. 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...
    view full answer...

  • Brake Controller Recommendation for a 2010 Volkswagen Jetta SportWagen
  • You will need to start with a 4-way (if you do not have one). For that you would want the # 119179KIT. From there you would need to convert the 4-way to a 7-way so that you can install the P3 brake controller # 90150. 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. This will be a bit more in-depth than installing the RF # 90250. For installing the RF you would...
    view full answer...

  • 10 Foot 7-Way Plug and Lead Recommendation
  • We have the very similar part # 50-67-005 which is basically just a 10 foot version of the part number you referenced. The 50-67-616 is just a 7-way plug and lead like the one I referenced with only a 6 foot long section of wiring. I attached an install video for you to check out as well.
    view full answer...

  • Looking for Adapter For 6 Pole Square Trailer Connector on Dutchman Camper
  • It probably wouldn't work. Jayco used a proprietary harness that most likely wouldn't fit. The 6 pole square harness is pretty much obsolete at this point, your best bet would be to cut it off and replace it with a more common trailer connector. In the photo, it looks like there's only 4 wires on the wiring harness. If that's the case, you could just use # 18004. If the wiring harness has 6 or 7 wires, I'd recommend using a 7-way connector like part # A7WCB, as it's what's most commonly...
    view full answer...

  • Recommended Replacement Wiring for 1996 Dutchman Duck with Obsolete Wiring Harness
  • Thank you for the picture. If the contacts on your trailer connector are like those on the Hopkins 6-Pole Square Connector Kit # 37995 then you can use 1/2 of this kit to replace your trailer's damaged connector and also Hidden Hitch adapter # 30104 to join it to your 4-pole-equipped vehicle. If this is not your connector then your best bet is to re-wire the trailer with a new 4-pole connector to match what is on your vehicle. You can use a junction box like # 38656 to join the existing...
    view full answer...

  • Troubleshooting Right Turn Signal Not Working On Enclosed Trailer Being Towed By RV
  • The best way to check a relay is to use a relay that you know is good and insert it into the suspected relay's spot. The first step would be to determine if the problem exists on the RV or on the trailer. Use a circuit tester like part # 3808 on the trailer connector at the rear bumper of the vehicle. Have someone activate the right turn signal, and for a 4-pole trailer connector, test the pin that is fed by the green wire. For a 7-way trailer connector, test the pin in the 3 o'clock...
    view full answer...

  • Trailer Wiring Harness for 2007 Ford Mustang
  • I'd recommend the # 18252, from Draw-Tite. To install, you'd use the included circuit tester to probe the wiring harnesses behind the taillight assemblies. Beginning on the driver's side, have a helper turn on the left turn signal, and use the tester to probe the wires until you find the one that makes the light on the tester blink. Tap the yellow wire into that circuit. Ground the white wire to the body of the vehicle, using an existing ground. Turn on the running lights, probe the wires...
    view full answer...

  • Trailer Wiring Recommendation for a 2005 Pontiac Grand Am
  • We have exactly what you need for your 2005 Pontiac Grand Am. For trailer wiring you would want the part # 119178KIT. This harness is designed to take separate taillight signals like what you have on your vehicle and convert them to combined so that it will work with the standard style of trailer wiring.
    view full answer...

  • How to Make a 7-Way to 6-Way Square Jayco Trailer Connector Adapter
  • Yes, the Jayco trailers use a very unique wiring on their trailers. There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts: 7-Way trailer connector # H20042 6-Pole Square Trailer Wiring Connector Kit, # 37995 Start by identifying the wire functions of the trailer side connector so that it will be easier to wire in the 7-Way later. Connect the 7-Way wires on H20042 to the...
    view full answer...

  • Left Side Trailer Running Lights Not Working, All Other Lights Work Fine
  • 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...
    view full answer...

  • Is 12 Volt and 4-Way of Hopkins Multi-Tow Trailer Connector Adapter # HM47675 Active at Same Time
  • Both the 12 volt port and the 4-way portion of the Hopkins Multi-Tow Trailer Connector Adapter # HM47675 that you referenced can be active at the same time.
    view full answer...

  • Replacement Trailer Wiring Converter Recommendation to Replace Shorted One
  • To replace the bad converter box you could use the # 56146. This will allow you to wire the converter to existing wiring of your vehicle and will come with a new 4-way connector. You will want to check the wiring of your trailer to find what shorted out your current converter before you replace it so that you don't short out the new one as well.
    view full answer...

  • Parts Needed for Custom Wiring a Trailer For Separate Turn and Brake Lighting
  • In order to have separate turn and brake lights on your trailer, I strongly recommend using a 2-wire to 3-wire converter, like the Tow Ready # 118158 on the trailer. This will allow you to have 4-way connectors on both the vehicle and the trailer. The 4-way connectors are much more common than 5-way connectors, and will allow to you tow other things with your vehicle, or tow your trailer with other vehicles, without the need for an adapter. This converter box is not designed to be exposed...
    view full answer...

  • Will 7-Way Round RV Style Trailer Connector Fit a 2015 Chevy Silverado's 7-Way Connector
  • Yes, 7-Way Round RV Style Trailer Connector # A7WCB will fit into the 7-Way on your 2015 Chevy Silverado. I have included a video showing an example installation for you and a link to our help article on trailer wiring.
    view full answer...

  • What is the Reverse Light Wire on the Hopkins Molded Trailer Wire Connector # H20046
  • If you will be using the Hopkins Molded Trailer Wire Connector, # H20046, then the yellow wire will attach to the wire from your reverse lockout solenoid. The yellow wire is attached to the center pin on the connector and the center pin in the trailer connector on your tow vehicle is for the reverse lights. Once the vehicle is shifted into reverse, the solenoid will close. I have attached a table that shows all of the wire functions for this molded trailer connector.
    view full answer...

  • Parts Needed to Make a 6-Way Square to 5-Way Round Adapter
  • What you would need to make the adapter you are looking for is the part # 37995 for the 6 pole square side and the part # PK11502 or part # PK11501 depending on which style 5-way you need.
    view full answer...

  • Could the Pollak 5-Way PK11501 be Used On a Motorcycle Trailer
  • If you have a 5-way round connector on your trailer that you tow with your motorcycle that you need to replace the part # PK11501 would work. I attached a review video for this connector for you to check out as well.
    view full answer...

  • Identifying Type of Brake Wire and Connectors Used on Trailer Brakes
  • The wire is likely just a version of automotive wire that is made more rigid so that it is easier to route it through tight spaces. Or it could be shielded wire or even cross-link wire. If you need some wire for electric brakes you can use # 10-1-1. The connector sounds like it might be a quick splice connector such as # 562 also known as a Scotch Lock which is the 3M name brand.
    view full answer...

  • Left Side Trailer Running Lights Not Working and Running Lights Blink with Turn Signals
  • When some of the lights are not working and when lights activate that should not activate that is an indication of a ground issue and likely a short as well. It sounds like you have addressed the potential ground problem but there are so many grounds on a trailer that you would need to check them all. But the first thing I would do is make sure the vehicle and trailer side connectors are clean and free of corrosion inside where the wires attach and outside on the pins. The light...
    view full answer...

  • Wiring And Flat Towing Recommendations For 2004 Jeep Cherokee Towed With Motorhome
  • To complete the wiring as you wanted I first recommend installing the Hopkins Tow Bar Wiring, part # HM55999. Then cut the 4-way plug off the harness and install a 7-way plug like part # PK12707. For a mounting bracket I recommend part # PK12711U-26. I recommend using the RoadMaster 6-Wire Flexo-Coil Cord, part # RM-1046-R and adding two male connectors like part # A7WCB. Since you said you are planning on flat-towing your Grand Cherokee, there are 5 items needed. This system would...
    view full answer...

  • Wiring Harness for 2011 Saab 9-3 Aero Sedan with Dual Exhaust
  • For a trailer wiring harness for your 2011 Saab 9-3 Aero sedan with dual exhaust you can use the Tow Ready 4 Pole Harness Hardwire Kit # 119179KIT. I have linked for you the written instructions, an install video and helpful article to aid your installation.
    view full answer...

  • What Circuit Should be Used for Wiring Up Third Brake Light on a Camper
  • For the lighting of a third brake light you would not want to use a circuit that has 3 volts of voltage at all times. You need to find a circuit that sees 12 volts only when the brakes are applied. You can usually find this circuit at the brake pedal switch. Or at the fuse box of your truck for the CHMSL (center high mount signal light) circuit. Or you could use the converter part # 118158 to convert your taillight signal to having a dedicated brake signal.
    view full answer...

  • Does the Lamp Out Bypass adapter part # 20142 Use Resistors to Prevent Lamp Out Error
  • The Lamp Out Bypass adapter part # 20142 that you referenced basically just has resistors in it to simulate the load of incandescent bulbs to prevent the lamp out error. It could be that the resistors you installed on your trailer have enough resistance to get the lights to function properly but not get rid of the error message.
    view full answer...

  • Turn Signal on Trailer Stops Working when Headlights are On
  • The problem you are having is a classic ground issue. If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned the extra amperage draw for the running lights will cause all sorts of lighting issues. I would start by removing the ground wire at the trailer coupler and cleaning up the connection point and re-securing it to the trailer frame. Next I would check the ground connection...
    view full answer...

  • Using Separate Brake Lights and Turn Signals on a European Trailer with US Chevy Silverado
  • The issue is that trailers in the US use a combined lighting system where the brake lights and turn signals are on the same circuit. European trailers have a separate circuit for each function. The wiring harnesses for US spec vehicles will take the separate brake light and turn signals and combine them for use with a US trailer. If you plug in a European trailer then it would function like a US trailer. To fix this issue you can install a converter on the European trailer. Converter...
    view full answer...

  • Trailer Connector on 2012 Chrysler Town & Country Shows 12 Volts on All 4 Pins All the Time
  • If you are using Curt trailer wiring harness # C56150 on your 2012 Chrysler Town & Country then those harnesses do have the tendency to show power all the time but there should not be 12 volts on the ground pin. No matter which harness you are using if there is power on the ground pin that indicates a short to ground. First make sure that the converter box white ground wire is attached to a clean bare metal surface with no paint or coating and it should be grounded by itself. You may...
    view full answer...

  • Boat Trailer Turn Signals Both Blink when Either Turn Signal is Used
  • The problem with wire color is there isn't really a standard so the functions could be anything. The best thing to do would be to test the wires on the trailer side since the 4-Way flat functions on the vehicle side should be typical of a 4-Way. To test the wires on the trailer there are a couple of different methods. First, you could trace each wire back to see where it ends and then make adjustments as needed at the connector. The other way is to use a separate 12 volt battery and...
    view full answer...

  • Location of Relay 201 on 1999 Ford Expedition
  • Relay 201 is the trailer tow park lamp relay and will be located in the Expedition's power distribution box which is located in the engine compartment. I have attached a picture to show you it's location in the box.
    view full answer...

  • Troubleshooting Left Side Turn Signal Not Working On Trailer
  • This sounds like a ground problem on the left side. I recommend that you first check the grounds on the left side. Trailer lights usually ground through their mounting studs unless there is an obvious ground wire. In either case, the ground will need to be attached to a clean and corrosion free bare metal surface. You can also make sure that the main ground from the trailer connector is also connected to a clean surface and that the connector itself is free of any dirt or corrosion....
    view full answer...

  • How to Replace a Euro 7-Way with a 7-Way Blade Connector
  • That is definitely a Euro style 7-way that you submitted a picture of. You would want to remove this connector and go with a standard 7-way blade connector like part # PK11893. The best way to do that is to use a circuit tester like our # 3808 to determine the functions of the wires by having a buddy apply the different brake and tail light functions while you use the # 3808 to determine which wire does what and then wire it to the 7-way like the picture I attached. Once you do...
    view full answer...

  • How to Wire Up Third Brake Light on a Truck for Camper Shell
  • Sounds like you are trying to wire up the third brake light of a camper shell. You could use the third brake light at the top of the cap (if equipped) and tap into the brake light there by removing the light to access its wiring. Or you could use a fuse tap and tap the stoplights and high mounted stoplight in instrument panel fuse block. And finally, a place that installs camper shells may know of a wire under the truck that carriers a brake light only signal.
    view full answer...

  • Function of the Yellow Wire for 4- to 7-Way Adapter 30717 and Where Does it Install
  • The yellow wire on adapter # 30717 can be for auxiliary 12 volt power or for reverse lights. Auxiliary power is not something commonly used on pop-up trailers. Essentially, it is just another 12 volt circuit to power things that need 12 volt power on the trailer. But since there is already a 12 volt circuit you likely would not need it. It would install the same way as the 12 volt circuit (black wire). You would run a length of wire, # 12-1-1, sold by the foot, from the yellow wire...
    view full answer...

  • Will Curt Trailer Connector and Backup Alarm for Dodge Trucks Fit a 2002 Dodge Dakota
  • Curt trailer connector # C57100 will fit your 2002 Dodge Dakota if the 7-Way trailer connector is a factory connector. There should be a rectangular plug that plugs into the back of the 7-Way if it is factory. I have included a picture of the back of # C57100 for you to compare. If the plug that plugs into the back of your 7-Way is round then you would use # C57101.
    view full answer...

  • Wire Functions on Trailer Connector on a 1995 Chevy Suburban
  • The likely functions of the wires on your 1995 Chevy Suburban are yellow for left turn and brake lights, green for right turn and brake lights, black (or brown) for running lights, and white for ground. But to be sure I highly recommend testing the wires using a circuit tester such as # 3808. After you have verified the functions of the wires you can use the picture I have included showing the functions and positions on a 7-Way vehicle side connector. Ignore the colors in the picture...
    view full answer...

  • Parts Needed to Rewire Triple Axle Gooseneck Trailer with Brakes
  • Since you mentioned that you want to rewire the whole trailer we will start off with a 7-way connector. For this you can use part # H20046 which will give you 8 ft of wire to start with. I then recommend using a junction box like part # 38656. This will mount to your trailer frame and you will use the posts inside the box to attach the wiring. This will make the rewiring process as easy and clean as possible. Next you will need to figure up how much wiring you will need. In this case...
    view full answer...

  • No Left Turn Signal/Brake Light on Trailer Connector on a 2003 Dodge Ram 2500
  • There is likely a blown fuse on your 2003 Dodge Ram 2500 that is causing the left turn signal/brake lights to not work. Use your owners manual or legends on the fuse panel lids to find the fuses related to the tow package wiring. Please note that there could potentially be more than one fuse for any given function so be sure to go through the whole list.
    view full answer...

  • Is Adapter Available to Connect 4 Way on 2013 Dodge Grand Caravan to 6 Way Square on Coachman Camper
  • In this case I recommend that you change out the connector on your Coachman trailer to match the 4 way connector on your 2013 Dodge Grand Caravan. You can do this by using the Hopkins Endurance 4-Way Flat Trailer Connector, # HM48110. Just cut the square plug off of the camper and apply power to each wire to test for function. The yellow wire on the connector will go with the wire on the trailer for the left turn and brake, green on connector to right turn on trailer, brown on connector...
    view full answer...

  • Trailer Brakes Not Working When Brake Controller Is Connected To The Trailer
  • The first thing I recommend doing is to use a circuit tester like # 3808 and test the functions of the wires on your brake controller adapter # 3035-P. The red (Stoplight) wire should show power only when the brake pedal is pressed. The black (Power) wire should show constant power. The white is Ground and the blue is trailer brakes. If the light on the brake controller is on and you have no trailer brakes when using the brake pedal or the manual control you will want to check the...
    view full answer...

  • Troubleshooting Trailer Right Turn and Brake Light
  • Since your 4-pole and 7-way vehicle connectors have correct signals and the trailer lights work properly when you hitch another tow vehicle I suspect that there may be an intermittent problem in the wiring. This could still be on the vehicle side or it could be on the trailer side. Older wiring can develop cracks and breaks inside the insulation that are not visible and sometimes the action of unplugging and plugging in a connector can make or break that circuit connection. A marginally...
    view full answer...

  • Troubleshooting Trailer Brakes that Lock Up When Trailer Connector is Connected
  • It sounds like the 12 volt accessory circuit has either been ran to the brake output circuit or it is shorting out to it. Most likely the problem is on the trailer wiring side of the equation as it looks like your truck is brand new. If you check out the diagram I attached you will see how a 7-way connector is typically wired for you to compare to the 7-way on your trailer. To check for shorts you would need to go over the wiring of the connectors looking for any bare wire that might...
    view full answer...

  • Troubleshooting Trailer Turn Signal/Stop Lights Not Working After 7-Way Install
  • The problem is the stop/turn signal circuit of the 7-way. The running lights for the taillights are their own separate circuit and there should be a second wire run to the taillights that carries the stop/turn circuit. I attached a diagram that shows how a 7-way is typically wired. If your current 7-way is wired up correctly the next thing to check is the grounds of the taillights as it sounds like they may not be sufficient to power the increased amperage draw of the stop/turn circuit....
    view full answer...

  • Can the RV Power Cord Adapter 09554 Be Used on a Circuit Protected 30 amp Circuit
  • It's somewhat difficult to follow what the circuits would be doing from what you described, but if you try to use 50 amps on a circuit that has a 30 amp circuit protector it will overdraw. If only 30 amps would be running through all of the circuits and the only thing 50 amp is the style of connectors then you would be fine.
    view full answer...

  • What Gauge Wire Does The Wesbar # 20016 5-Pole Vehicle End Trailer Connector Use
  • The Wesbar # 20016 5-Pole Flat Vehicle End you referred to uses 18 gauge wire. The yellow wire carries the left turn signal/brake lamp, the green carries the right turn/brake lamp, the brown carries the running light signal, the white wire carries the ground and the blue wire is connected to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer brakes, so the vehicle can back without actuating the surge brakes.
    view full answer...

  • Trailer Right Turn & Right Brake Lights Do Not Work After Installing Wiring Adapter # 37185
  • Both trailer right turn and right brake light signals are carried on the same wire, a green wire in the case of the Hopkins adapter # 37185. Since these are the only functions not working I suggest you first test the green wire on your Jeep's 4-pole harness, the harness that plugs in to the Hopkins adapter. You'll want to look for signs of discoloration or corrosion on the contact pin for the green wire; clean as needed. If you have a circuit tester like # 3808 or # 40376 you can test that...
    view full answer...

  • Parts Needed To Rewire Trailer with 9 Way Connector to 7 Way Connector
  • I would recommend replacing your 9 pin with a 7 pin connector. The part I recommend is # A7WCB. This is a round power plug that connects with the 7-way \blade connector of the tow vehicle which it sounds like you have. If you need to replace the 7 way Connector Socket on your vehicle I recommend # PK11893. Please note that no matter what 7-Way you want to put on your trailer the color of the wires used is not standardized. Trailer manufacturers or people who rewire their trailers at...
    view full answer...

  • Wiring Harness and Brake Controller Fit for 2006 Dodge Ram Pickup.
  • The Vehicle Wiring Harness Kit # 119147KIT will provide you with a 4-way trailer connector. This connector will be hardwired into your vehicle and provide tail lights, brake lights, and turn signals for the lights on your trailer. This connector will not provide operating power to the trailer's electric brakes. If your Ram Pickup does not have a factory socket at the rear of the vehicle for a trailer connector, you will want to use a hardwire kit, such as # 119147KIT. To provide the...
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2014 Volkswagen Passat
  • Not every vehicle has a custom fit trailer wiring option available. The popular vehicles for towing will commonly have a harness available. At this time there is only a hardwire trailer wiring kit available for the 2014 Volkswagen Passat, part # 119190KIT. I attached an install video that shows this harness getting installed in a 2014 Passat for you to check out as well.
    view full answer...

  • Troubleshooting Brake Controller that Intermittently Says it is Not Connected
  • There is a loose wire or an intermittent connection somewhere on the brake output circuit of your tow vehicle/trailer. That is what is causing the controller to periodically display that it is not connected to a trailer. If a wire once vibrated loose I would first inspect the condition of the wiring of both connectors and clean of any corrosion you find as that is the usual problem. Most likely the actual problem is not the connectors and is just the wiring/corrosion. I also attached...
    view full answer...

  • 7-Way to 4-Pole Adapter Not Functioning When Installed on 2001 Land Rover Discovery II
  • I'd begin by testing the 7-way on the Land Rover. The trailer wiring FAQ I've linked you to will show you which pins on the 7-way will show voltage as each turn signal/brake lamp/ running lamp function is activated. Make sure the 7-way is wired as shown in the FAQ. Then, plug the adapter into the 7-way and test each function. If you don't have a circuit tester, we offer one as part # 40376. Usually when you have both turn signals operating at the same time, it indicates a ground problem....
    view full answer...

  • Troubleshooting Why Truck Has Running Lights But Trailer Does Not Have Lights When Connected
  • You will want to use a circuit tester like part # 3808 and do some testing. Have someone run through the functions on the truck while you check the pins on your trailer connector at the back of your truck. Make sure they are clean and free of corrosion, and that the ground is securely attached to a clean metal surface. A loose ground will cause all kinds of issues. You will also want to check the fuse panel and see if there is a towing fuse needed and make sure it is not blown or missing....
    view full answer...










Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email






etrailer.com reviewsetrailer.com reviews

All images, layout and content copyright etrailer.com