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Expert Answers about Wiring


  • Parts Needed to Add Brakes to a 1995 Jayco Camper 1005
  • We have just what you would need. Thanks for getting me the bearing information as that allowed me to piece together what hub you would need. For a hub and drum you would want the part # 8-173-16UC3. This will fit your spindle and wheels as it has a 4 on 4 inch bolt pattern. For brake assemblies you would want the part # 23-48 for the right hand side and part # 23-47 for the left hand side. For a breakaway kit you would want the part # 20099. For a brake controller I would recommend...
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  • Trailer Wiring for 2011 Mercedes Benz E350 4Matic Wagon
  • We have two different trailer wiring harness recommendations for a 2011 Mercedes-Benz E350 Wagon. One would be the Curt # C59236 you mentioned, the other would be the # 119250KIT from Tekonsha. Both harnesses would need to be wired directly into the taillight wiring of the vehicle, but while the Curt harness would require splicing into the existing wiring, the Tekonsha ZCI wiring harness # 119250KIT features sensors that would clamp over the wires without piercing them. I like the fact...
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  • Recommended 7-Way Wiring Components for 2002 Coleman Pop-Up Camper
  • We do offer wiring adapters that allow connection of different formats of trailer wiring, but these are not the best long-term solution. Adapters add connection points, which bring the potential for problems, so the best option for trouble-free wiring is to swap out the 6-pin connector on the Coleman for a 7-way plug like # H20044. All you need is a wiring junction box like # 38656 and ring terminals for making the internal connections from the new plug and the trailer's existing wiring. You...
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  • Is the MaxxTow Trailer Connector Adapter MT70086 Missing Ground Circuit
  • Actually the ground is the in in the 5:00 position and not the 7:00 position so the part # MT70086 does have a ground circuit. I attached a picture that shows the circuits on a 7-way all labeled.
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  • How Can I Just Use the Ground In a Wiring Adapter For My 4-Way to 7-Way Adapter
  • You will be able to just use the ground with the Hopkins Adapter # 37185 which is found in our Universal Installation Kit # ETBC7. We do not have a version with just the ground, but you will be able to use this adapter and cap off the extra wires you will not be using. If you are planning on installing a brake controller in the future, then you will just need to purchase a brake controller wiring kit # 5506.
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  • Trailer Wiring Recommendation for a 2002 Nissan Xterra
  • If you get under the 2002 Nissan Xterra and find the connector that you see in the install video for the # 118244 you would need first test it with a circuit tester like part # 3808 to see if the pins are active when you apply turn signals on your Xterra. If so, then yes this kit would fit. If not, you would need to hardwire with the part # 119178KIT. The Draw Tite hitch part # 75107 that you referenced as well is the correct hitch for your vehicle. If you wanted to do some towing...
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  • Bypassing Ram 2500 TIPM for Trailer Wiring Solution
  • The trailer wiring circuits on the newer Dodge trucks have some interesting issues. The issue is the TIPM like your mechanic mentioned. If it detects enough shorts it will eventually lock up and require you to spend quite a bit of money. It basically is a big circuit board like he said though. The easiest way to deal with them is to bypass the factory trailer wiring. To do this with a 7-way like you said you have on your truck you will first need to start with a 4-way. For that you will...
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  • Where to Find 7-Way Circuits for Installing 7-Way on a 2011 Ford F-350
  • The wires you mentioned could potentially be the correct wires needed, but you would have to test to be sure. You would need to test each for voltage when the correct circuit is applied. If one of the wires has voltage all the time it would be the 12 volt accessory circuit, if one has voltage when the vehicle is in reverse it would be the reverse light circuit and finally the last circuit would be for the brake output. Most likely these are not the correct wires, but I know where...
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  • 7-Way Trailer Wiring Harness Recommendation for a 2001 Nissan Xterra with 4-Way
  • What you are going to need is the 4-way to 7-way adapter part # 37185 which will convert the taillight signals of the 4-way to a 7-way and then you would need to run the power wire from the 7-way to the battery of your Xterra with 10 gauge wire like part # 10-1-1 through a circuit breaker like part # 9510. This will be relatively painless, but you will need to route the wire underneath your vehicle to the battery avoiding any hot areas that might melt the wires or moving parts that might...
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  • Why Would Trailer Brake Controller Circuit Always have Pulsing Signal On Circuit
  • The pulsing you are seeing on the brake controller output circuit is normal. That is the controller testing the circuit to see if it detects the load of trailer brake magnets. If it detects the magnets it will show that the controller is connected. If it doesn't sense anything the controller shows that it is not connected to a controller. The problem has to be on the car hauler trailer. First thing to check is for corrosion on the trailer connector as that typically is what prevents...
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  • All Trailer Taillight Functions Work Except Running Lights
  • This could certainly be a grounding issue. When a circuit does not have a sufficient ground, it can cause many different issues. If possible, I recommend checking all of the grounds for your trailer taillights. You will want to make sure the ground has contact with a bare, clean, metal surface of the trailer frame. If there is any rust or corrosion at the light ground, try relocating the light grounds to a suitable location. Another possibility is that the wire for the running light...
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  • Can the 4-Way part # HM48133 Attach to Trailer with 2 Brown Wires
  • Your trailer has two brown wires because the running light circuit goes to both sides of your trailer. You would just want to connect both wires into one end of a butt connector like part # 05732-2 and then have the single brown wire of the # HM48133 run to the other side. Be sure to crimp these connections very tight.
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  • 24 inch Extension for 7-Way for Truck with Camper Towing Trailer
  • For a 24 inch 7-way extension designed for what you are looking to do you would want the Torklift Wiring Harness Extension part # TLW6024. For an adapter to convert this to a 4-way you would want the part # PK12716.
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  • Recommended 7- and 4-way Bumper Plug Extension for Use with Cabover Camper
  • I have just the thing for you to extend your bumper plug to the end of your camper. If you want to get the 7-way and 4-way you will want the # H20042 and the # HM48470. This combination will need to be wired up but will include the mounting bracket for the 7-way and 4-way. If you prefer to have a prewired 7-way the one you will want it the # TLW6021. All of our prewired ones will only include the 7-way. A mounting bracket for this extension plug is # TM76474. I have linked all...
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  • Would the Adapter 7 Pole to 4 Pole 47345 Fit a 2004 Chevy Silverado
  • If your 2004 Chevy Silverado has a 7-way connector on it like the part # PK11893 yes, the part # 47345 would fit it and work well.
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  • Replacement 7-way & 4-way Trailer Connector for ETBC7 Kit
  • The # 37185 is the exact 7- & 4-way plug that is included in the # ETBC7 kit. We kit the # 37185 together with the # 5506 kit and some zip ties and wire loom to make a complete kit. The # 37185 will include the cover for the 4-way connector. To replace the 7-&4-way connector you will also need to re-splice your connections to the new wiring, this also comes with the 4-way connector for your already existing wiring harness. If you are wanting to replace this as well the T-One harness...
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  • Installing HM20048 Molded 7-Way Trailer Connector on Surge Brake Equipped Boat Trailer
  • If you scroll to the bottom of the product page of the # HM20048 connector, you can see the color code chart that shows which colored wire carries which function. The yellow wire on the # HM20048 would carry the signal from the reverse lights, assuming that the center pin of the trailer connector is tied into the reverse lamp circuit. Since you're using a surge brake system, you won't need the blue wire as you suspected. If the trailer doesn't have a battery or any accessories that require...
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  • Is Plug And Play Trailer Wiring Harness Available For 2001 Toyota Solara
  • The # 118407 trailer harness wiring kit is not designed as a fit for your Solara, but we do have trailer wiring harnesses that can be hardwired. It is a little more work but really not that tough. I recommend a kit like part # 119147KIT. This kit includes the Modulite that helps protect the Solara wiring and a circuit tester to help you identify the correct wires on your Toyota when installing the harness. You can have someone sit in the driver seat and go through the functions...
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  • How to Determine the Functions of 4-Way Flat Trailer Connector when All Wires are the Same Color
  • Yes, on a 4-Way flat trailer connector there is one covered pin and 3 exposed pins. The one covered pin is the ground. Next to it is the running light pin. Then the left turn signal/brake light pin. And the last pin is right turn signal and brake lights. If any of the lights light up when you applied power to the ground then there is a short somewhere that will need to be fixed. That will be easy though since you can just attach a new wire to the ground wire at the back of the connector...
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  • Wiring Adapter for 6-Way Round Connector to 6-Way Square Jayco Trailer Connector
  • The only 6-Way square to 6-Way round wiring adapter that we offer is the Hopkins Trailer Connector Adapter # HM47415. However, this adapter only measures 10 inches long overall. These square connectors are popular on older Jayco trailers, but are not common in the industry so there are very few adapters made for this style connector. For an adapter that measures 24 inches, you will want to use a 6-Way Square Connector # 37995 wired to a 6-Way Round Connector with Cable # 50-61-104....
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  • Adding a Functional 7-Way with Reverse Light Circuit to a 2004 Ford F-150
  • If your 2004 Ford F-150 has a factory installed 4-Way trailer connector and you install 7-Way # 118247 and its relay (and all of the other tow package fuses/relays are in place) then you will have a fully functional 7-Way connector and the reverse light circuit will be active. This will then activate the reverse lockout solenoid that is on the boat trailer so the brakes won't engage when in reverse.
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  • Adding a 7-Way and Electric Brakes to a Trailer
  • Sounds like you are looking to upgrade a trailer from having idler hubs to one that has brakes. There are several things to consider and determine to do this. If you check out the FAQ article I attached you will see exactly how to add brakes to a trailer that didn't have any. You will need to remove your hubs to either get the bearing numbers or spindle dimensions so that you can determine what hubs would fit your spindle. They aren't all the same so this is a very important first step....
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  • Trailer Wiring 4-Way Harness Recommendation for a 2005 Subaru Baja
  • For your 2005 Subaru Baja there is a trailer wiring option confirmed to fit, but not a T-connector type that would plug inline. Instead you would need to use the hardwire kit part # 56146KIT that is a universal fit kit that will work on your vehicle. This is the best priced option we carry as well.
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  • 7-Way Trailer Connector Will Not Fit in 7-Way on RV
  • There are some 7-Way connectors/sockets that have blades that are a little larger than others and can cause this issue. Sometimes you can force the trailer end in but I recommend replacing the connector on your RV with a new one such as # PK12707 if the one you have now has wires that attach directly to it or # PK11893 if the one you have now accepts the standard US car connector that plugs into the back of the 7-Way. But what you show in the picture seems pretty standard to me so it's...
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  • Options For Installing Trailer Wiring Harness On 2014 Lexus RX 350 Without Factory Tow Package
  • I called my contact at Tow Ready and asked about trailer harness installation on your 2014 RX 350. It seems there may be a couple ways to get a connector on your Lexus. My contact said you may want to call your dealership and see what is involved in turning on the factory tow package since you have the connector. We have had customers say that the dealership says it is not just a matter of turning it on and other items need to be purchased. This can prove to be costly. If you do find...
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  • How Would Trailer with 4-Way Wire to the 7-Way part # H20042
  • It sounds like your current 4-way has two wires ran to the running light circuit (one for each side of the trailer) and the rest of the wiring is standard. Especially considering the order of the colors that you listed. Green is right turn/stop, yellow is left turn/stop, brown is running light, and white is ground. To wire that to the part # H20042 that you referenced would require you to use the information I just listed and compare that to the diagram picture that I attached. You would...
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  • Options for Extending 7-Way Vehicle-Side Connector while Towing Tent Trailer and Bike Rack
  • I have a solution for you, but the Curt 7-Way Trailer Adpater for VW, Audi, and Porsch Towing Trailer with LED Lights # C57003 is designed for that specific application and would not work well if you do not have one of those manufactures as a tow vehicle. For a plug and play option, you can use the TorkLift Wiring Harness Extension # TLW6021. This harness will offer much more than the 3 inch extension you are needing, so the excess on the extension will need to be kept off the ground...
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  • Recommended 7-way Blade to 6-pole Round Adapter with Hot Lead in Center Pin
  • If you have the Hopkins # 47549 that you referred to in your question you should be able to open up the adapter and repin the two wires to swap the function. Since there are two standards of wiring a 6-way in the market they made this feature available to do. If you would prefer to just purchase a 7-way blade to 6 pole adapter that is already prewired for your type of horse trailer you will need the Hopkins # 47525. Another really neat option is the Hopkins # HM47570, this adapter...
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  • Recommended 7-way Wiring Harness Extension for 2007 Chevy Silverado 2500HD with Lance Cabover Camper
  • I looked up your Lance Cab Over Camper and it looks pretty awesome! The 7-way wiring harness you will want to use to extend the bumper socket to the bed is the Hopkins # 41157. This 7-way plug includes 10 feet of cable to reach the area of the bed you will need for your 2007 Chevrolet Silverado 2500HD. I have linked both the product and an installation video of it being installed on a 2007 Silverado to this page for your convenience.
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  • Tips for Getting 4 Wires to Fit in Power Grip Replacement RV Power Cord Plug
  • You might need to remove any loom or jacket on the wires you are using (the black part in the pictures/video we show) so that it is not sandwiched between the 2 halves of the plug, # CAM55255. It might also help to manipulate and move around wires enough to be able to get the screws started. But loom or jacket can be pretty stiff and hard to compress so having just the 4 insulated wires not contained in a loom or jacket would make it easy to close it all up.
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  • Trailer Brakes Stay Locked Up Unless Trailer Battery is Disconnected
  • It sounds like your trailer might have a breakaway system and the pin is pulled out of the switch. that would complete the circuit from the battery to the trailer brakes. That would explain why the brakes release after you unhook the camper battery. Inserting the pin back into the switch will stop that from happening. You can also replace the switch using # HM20010. It is also possible that there is a short somewhere and battery power is feeding to the trailer brakes. You can inspect...
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  • Availability of an RV Style 7-Way to 7-Way Extension
  • If you want to use # WG54006-043 then you just need the vehicle end, such as # PK12707, since it already has the trailer end on it. We have some ready-made 7-Way extensions that you can use such as # 20027 or # C56080 which are 7 feet long. We have a shorter option, # TLW6021, which is 21 inches long. And we have a 10 foot long model # TLW6510.
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  • Does Engine Have To Be Running For Emergency Flashers To Work And Will Trailer Lights Flash
  • If you turn on the emergency flashers in your Santa Fe, the lights on the trailer should also flash. That is assuming everything between the vehicle and your trailer is wired correctly. The engine does not need to be running for the flashers to work. The trailer wiring harness you need on your 2012 Santa Fe depends on whether the vehicle has the factory tow package. If you have the tow package the wiring harness I recommend is part # 118258. If you do not have the tow package I...
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  • Troubleshooting Trailer Brake & Turn Signal No Longer Working While Running Lights Work 2015 Arcadia
  • Sounds like you maybe have a blown relay or fuse. I would start there. The right and left trailer stop and turn signals should be right next to each other according to the diagram in your owner's manual. I have linked both the HID and Halogen models fuse box layouts to this page for your convenience. If you continue to have issues after this just let me know, I would be more than happy to help you continue to troubleshoot this issue.
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  • Trailer Wiring Harness Recommendation for a 2009 Saturn Aura
  • I have a much better solution for trailer wiring for your 2009 Saturn Aura than the Hopkins kit you mentioned that requires hardwiring. Instead you would want the part # 118423 which is a custom fit kit for your vehicle that does not require any hardwiring. All you have to do is install the connectors of the harnesses in line with the taillight connectors on your vehicle and the 4-way of the kit will be active and ready to go.
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  • Are the Pollak 7-Way Connectors part # PK12707 and # PK12706 Designed to Work Together
  • Yes, the two connectors you mentioned are designed to work together. The 7-Way connector part # PK12707 is a female connector that the part # PK12706 would fit into. These are both considered RV-blade style 7-way connectors.
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  • Location of Fuse for 12-Volt Feed to 7-Way Trailer Connector on 2002 Chevy Yukon
  • The fuse you're looking for is located in the fuse box under the hood. It's a 40 amp fuse labeled 'stud 1', I've provided a photo showing where the fuse is located. Once the fuse is replaced, you'll want to locate the short that caused the fuse to blow and repair it, or you'll continue blowing fuses. Check the connector on the trailer and on the vehicle, and make sure they're not damaged or corroded. Repair or replace as needed. Make sure the circuit from the connector on the trailer...
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  • Recommendation to make Trailer 7-Way Longer
  • The closest adapter we have to what you need is the Torklift part # TLW6021. This is a 7-way adapter that has a male end on one side and a female on the other. It measures a little longer than you requested at 24 inches though. Your ideal solution would be to remove your current 7-way and install a longer one on your trailer like with the part # H20042 that is a 3 foot long 7-way plug and lead. You could trim this down to match your trailer length needs as well.
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  • Can Trailer Wiring Harness 119179KIT Install a 4-Way On a 2010 Audi A6
  • The # 119179KIT can be used to install a US spec 4-way on your vehicle, but it will require you to use the included circuit tester to determine the functions of the wires on your vehicle first. I wish we had a wiring diagram for your vehicle but that's not available to us. The testing process really isn't too difficult though. If you check out the install video I attached you will see how it is done on a similar German vehicle as yours.
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  • Trailer Brake Lights Not Working when Connected to 2004 Porsche Cayenne S with Factory Tow Package
  • The first place I recommend checking is the trailer connector on your 2004 Porsche Cayenne without the adapter or trailer plugged in. Use a circuit tester such as # 3808 to test the pins in the 3 o'clock and 9 o'clock positions while someone sits in the vehicle and presses the brake pedal. If there is no power on those pins during this test then it could be a fuse or relay related to the tow package wiring. Your Cayenne has a fuse box under the hood and in the cab on each end of the...
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  • How to Determine Trailer Wiring Functions for Installing New 7-Way Connector
  • The colors that are used on your trailer are not the industry standard colors so you would need to test them to determine their function when wiring up a new connector for them. One way is to use a jumper wire from a 12 volt battery to put current on each circuit to see what light functions illuminate. Or you can trace each of the wires to see where they go and determine it from there. For a new 7-way to wire to the trailer we have the part # H20046. I attached a chart that details...
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  • 2016 Prius Touring Four Trailer Wiring and Hitch Fit Recommendation
  • We spoke with our contacts at Curt and we can confirm the fit of the Curt harness part # 56146KIT for the 2016 Toyota Prius Touring 4 hatchback. The recommended hitch is the Curt # C11426 as well. For a ball mount you would want the part # C45572 for a 2 inch ball or part # C45571 for a 1-7/8 inch ball.
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  • Finding Intermittent Ground Problem in Wiring of Trailer Towed By 1992 Geo Tracker
  • I'm still leaning toward a insufficient ground connection as being the cause of the problem you're describing. To confirm it, you'll need length of wire long enough to reach from your ground connection on the trailer tongue to the negative battery terminal on the vehicle. If connecting the wire to the wire to the negative battery terminal fixes the problem, you've pretty much confirmed a poor ground as being the issue. I'd also check the spot on the tow vehicle where the # C56175 grounds....
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  • Recommended Female Semi-Trailer Connector
  • Sounds like you are looking for the trailer end plug for your tester that will fit into semi-trailers. Most commercial trailers will use a 7-way heavy-duty pin setup like # PK11720. The female matching connector for this is the # PK11700 you were looking at. To wire this up to your tester I recommend a length of jacketed 7-wire # DW04914-1, this is sold per foot. You will also want to verify the pin functions of the trailer, many of the semi trailers are wired with separate wiring,...
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  • Availability of 7-way Round Pin to 7-way Blade RV Style Trailer Connector Adapter
  • So you're needing a 7-pole round to 7-way RV (blade) style connector adapter, is that right? We don't have an adapter like that (due to the fact that the 7-way round pin connector is pretty rare these days), so the easiest thing to do would be to replace the existing 7-way round pin connector on your vehicle with a 7-way blade style connector like # PK11893 and a # PK11998 7-way pigtail. Or, if it's still needed, you could leave the existing 7-way round pin connector in place and tap the...
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  • Trailer Wiring Harness for a 2013 Lexus RX 350 Without Factory Tow Package
  • If your 2013 Lexus RX 350 did not come with the factory tow package I recommend using the ZCI harness # 119250KIT. With this harness you will not have to splice into the vehicle wiring. It has connectors that clamp around the tail light wiring and sense the current flowing through the wiring. It's kind of awesome! Since you want to do some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch...
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  • Left Side Trailer Lights Not Working But All Other Lights are Fine
  • On a 7-Way trailer connector usually the wire functions are green for running lights, black for 12 volt power, yellow for reverse lights, brown for right turn/brake lights, red for left turn/brake lights, blue for electric trailer brakes, and white is ground. With that said it is best to test the connector using a circuit tester such as # 3808 while someone sits in the truck and runs through the lighting functions. On the trailer, the 4-Way will have the one covered pin as the ground....
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  • Recommended 7-Way Trailer Connector For 2006 Toyota Tundra To Work With 7-Way On Trailer
  • If a 7-way connector is present on a trailer, it typically means the trailer has brakes. You can use a circuit tester like part # 3808 and a 12V battery to test the 7-way connector pins on the trailer to see what functions are active. If you plan on using the brakes on the trailer you will need a couple of items. You will need a brake controller and a 7-way on your Tundra that will carry the signal form the brake controller to the brakes on the trailer. If you do not plan on using...
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  • Parts Needed to Install a Brake Controller in a 1999 Ford Expedition with 4-Way
  • One of the components needed to install a brake controller in your 1999 Ford Expedition is the part # 37185 that you referenced. You would also need a brake controller and install harness. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional brake controller that senses the amount of braking the tow vehicle is applying and applies...
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  • Trailer Wiring Harness Recommendation for a 2016 Lincoln MKC
  • For your 2016 Lincoln MKC we have the Tow Ready Wiring Kit part # 119147KIT which is a confirmed fit. To install this harness will require you to test the circuits of your taillight harnesses and then wire them appropriately to the wires of this kit. The install video I attached shows this process on a different vehicle. The wire colors would obviously be different but the process would be the same.
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  • Troubleshooting P3 Brake Controller Not Connected Error on a 5 Prong Boat Trailer
  • Don't worry, I can help. The reason your brake controller is reading "no trailer connected" is because the 5- to 7-way adapter you are using cannot read electric brakes. There is no 12V power or brake wire signal on a typical trailer end 5-way. Your best bet is to add a 7-way connector to the trailer like # ET7WK. This kit includes a 7-way, a junction box, and hardware. To complete the connection you will want to run 10 gauge wire like # 10-1-1 from the junction box to the brake...
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  • Trailer Wiring Harness Recommendation for 2007 Audi Q7
  • I checked with my Tekonsha representative to get his advice on a trailer wiring harness for your Audi Q7. It turns out that they have the perfect solution, the ZCI trailer wiring harness, part # 119250KIT. This is not a plug and play kit, but the good news is that the zero contact sensors won't require any cutting or splicing into the wiring of your Q7. The harness includes a circuit tester to help you identify which circuit in the taillight harnesses carries which function. I've...
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  • Equipment Needed to Install 7-way Trailer Connector on RV and 1996 Toyota 4Runner
  • The Curt # C57674 you mentioned would be a fine choice. For the RV, you'd plug in the C57674 adapter to the existing 4 pole, which would provide lighting for the trailer. If the trailer doesn't have brakes, your install would be complete. If the trailer has brakes, you'd need to install a brake controller using a # 5506 brake controller install kit. The kit includes 25 feet of wire, which wouldn't be enough for an RV. Extra wire is sold by the foot as part # 10-2-1. For the 4 runner,...
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  • How to Turn Off Back-Up Alarm of Curt C57100 When Not Towing
  • Once the Curt # C57100 is installed, the alarm will sound every time you put the transmission in reverse, regardless of whether or not you're towing at the time. The only way I can think of to defeat the alarm for when you're not towing would be to install a switch like # PK34308 inline on the wire feeding the reverse lamp circuit to the # C57100. You'd need to peel back the tape or wire loom that covers the factory wiring harness the C57100 plugs into. Use a circuit tester like...
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  • Replacement Wiring Recommendation For Small Trailer With No Brakes
  • If you are wanting to re-wire your trailer, we have just what you need. For a small trailer with no brakes I recommend the Hopkins Endurance 4-Way Flat Trailer Wiring Harness, part # HM48240. This is a wishbone harness that has 2 separate, brown tail light wires which is nice so you do not have to tee intot the wiring for your running lights. The left-side tail light wire is bundled with the yellow left turn/brake wire and the right-side tail light wire is bundled with the green...
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  • Troubleshooting Curt 4-Pole Trailer Wiring Harness Installation in 2016 Kia Sedona
  • Thank you for your recent hitch and wiring harness purchase. I am sorry that Curt 4-pole wiring harness # C56151 is giving you trouble in your 2016 Kia Sedona, which is intended for vehicles with the tow package. We're glad to help you troubleshoot. It sounds like you applied a circuit tester like # 40376 to the pins on the 4-pole after you competed the installation. We know the harness is getting power since it is able to deliver the running light signal to your trailer. This means...
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  • Where to Find Dome Light Wire to Tap into for Running Board Lights on 2016 Chevy Silverado 3500
  • Your best option is to test the wires you have found using a circuit tester such as # 3808. If you alternate the dome light on and off while testing you can identify the correct wire. It is also possible to tie into the switch at the door that allows the dome light to come on when the door is opened. And a third option is if the dome light is on its own fuse you could tap in at the fuse location as well. But if the dome light shares a fuse with anything else then the running board...
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  • 5th Wheel 7-Way Harness Recommendation for 2015 Ram 2500 to Install in Truck Bed
  • For a 7-way to install in the bed of your 2015 Ram 2500 to make connecting your trailer lights easier you would want the part # 41157. Most 7-ways will be at the rear of the truck near the bumper which doesn't work will with fifth wheel hitches. I attached an install video that shows this harness being installed in a similar Ram as yours too.
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  • What To Do with Extra Wires of Adapter 37185 that are For Unused Circuits
  • You are correct. The unused wires of the # 37185 can be taped up and out of the way since you have no use for them.
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  • What Trailer Wiring Bracket is Recommended for the 4-Way to 5-Way Adapter TR20046
  • The # 47515 would be a bit too thin to fit the # TR20046 perfectly so a better option would be the # 18145 which is essentially a box that would hold the connector and protect it from the elements.
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  • Availability of Wiring Connector from 4-Way Flat Vehicle Connector to 6-Way Square Camper Connector
  • If your pop-up camper is a Jayco, you can use the Adapter 4-Way Flat to 6-Way Square for Jayco # 30104. This adapter will work well to connect your vehicle's 4-Way flat to the camper's 6-Way square. Keep in mind that some of the functions will be lost with this adapter, but the taillights, right turn/stop, and left turn/stop signals will still work well. If your trailer is not a Jayco pop-up camper, the best solution I can offer is to replace the trailer connector and your vehicle end...
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  • Replacement for 7-way Trailer Connector Adapter Included w/ ETBC7 Brake Controller Install Kit
  • The easiest replacement would be to replace the 7-way used in the # ETBC7 kit, which is # 37185. You could use the Curt # C58000 bracket if need be, but I'd recommend going with the Hopkins # HM47210 7-way instead. The # HM48480 you referenced doesn't include a pigtail, so it wouldn't work for you. If you click the provided link, you can view a video that explains the wire color codes.
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  • Wiring in Amber Side Marker Trailer Lights that have Black and Yellow Wires
  • Many lights will list the wire functions on the back where the wires enter the light housing. If the functions are not listed it is likely that black is the ground wire and will attach to the trailer frame. The yellow wire would then be the power wire. Since it is a marker light the yellow wire would connect to the running light wire on the trailer. On a harness such as # A35W42B it wood be one of the wires with a brown stripe.
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  • Troubleshooting Trailer Running Lights with Potential Grounding Problem
  • It sounds like you have the lights wired properly, but if the trailer's main white ground wire is not grounded to the trailer frame it is quite possible that some light functions will work while others will not. Often it can happen that a weak ground will allow enough current for some lighting functions to get through, but not enough for other functions. Running lights, which stay on, draw more power than other lights (brakes and turn signals) that are on only briefly. This could be why...
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  • Recommended Wiring Adapter For Truck To Work With 6-Way Connector On Horse Trailer
  • Since you said you have a round 6-way connector on the trailer and a flat connector on the truck I assume the truck has a 4-way connector. If that is the case then you can use the Hopkins Trailer Wiring Adapter, part # 37175. This plugs into the 4-way on your truck and will have 3 other wires to deal with. The white wire is a ground and will need to be attached to a clean bare metal surface on the vehicle. The center pin(blue wire) is used for electric brakes, and the red wire is for...
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  • Trailer Wiring Harness for 2014 Mercedes GLK350
  • The ZCI Trailer Wiring kit part # 119250KIT that you referenced is a confirmed fit for your 2014 Mercedes GLK350 as it can basically be installed on any vehicle and since it does not require cutting or splicing into the vehicles wiring it would not void any warranties either. Instead of splicing into the wires the sensors of this kit just clamp around them and sense that voltage is being carried on the wire and that is what is used to signal which trailer wiring circuit needs to activated....
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  • Troubleshooting 4-Pole Wiring Harness That Does Not Show Brake Lights Illuminated
  • Thank you for your recent hitch and wiring harness purchase. On a 4-pole harness like # 119190KIT the running light signals are carried on the brown wire and the stop/turn signals are combined and carried on the yellow and green wires. These are the connections you made at your taillights with the quick-splice fasteners include in the kit. If you do not see the brake lights on the trailer you can check whether you get turn signals on the trailer. If you get turn signals but no brakes...
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  • Running lights on trail tech utility trailer
  • The only way to know for sure how the side marker lights are wired is to take one loose from the trailer and check the wires on the back of the light to see what color it is. I have attached a drawing that shows how trailer wiring is typically run. As you can see the green wire is for the right hand tail light and the yellow is for the left hand(driver side). Chances are that the black wire is used for a light bar or license plate light. The easiest way to find out is to use a circuit...
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  • 6-Way Motorcycle Trailer Connector that Doesn't Require Mounting
  • How does a 6-way SQUARE sound? Based on what you described the part # 37995 would be your best option as it comes with both sides of a 6-way connector that neither require mounting permanently to the motorcycle or trailer. The reason I recommended this is that there are no 6-way flat connectors and the round ones are designed to be mounted on the vehicle side. I attached a review video for this for you to check out as well.
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  • What is the Function of the 5th Pin on a Trailer Connector 5-Way Flat Connector
  • The 5th wire on a 5-Way flat connector is intended to connect to the vehicle's reverse light circuit. This is for the exact situation you described, so the 5th wire can signal a surge coupler's electric reverse lockout. If you need a 5-Way flat trailer-side connector, you can use the Draw-Tite 5-Flat Trailer End 48 Inch Harness # 20017. This connector is designed for the 5th wire to carry the reverse light signal from the vehicle to the brake actuator. The # 20017 connector will...
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  • Troubleshooting Brake Controller Not Working On 2002 Chevy Silverado
  • Sounds like a blown CHMSL fuse on your truck. This is a very common problem for your generation GM truck that just stops the brake controller from working. This is actually the second time I have seen this exact problem today on your generation of truck. The CHMSL fuse controls the third brake light of the truck. I bet if you were to go out and look at the third brake light while a buddy hits the brakes it wouldn't come on.
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  • Troubleshooting Trailer Brakes that Lock Up When Vehicle Brakes Are Touched
  • Sounds like one of the stop/turn signal circuits is shorting out to the brake output circuit which is causing 12 volts to apply to your trailer brakes when the brake lights illuminate. To narrow down which blinker circuit is at fault apply each of the blinkers and the brakes will start pulsating with the blinker that carries the circuit with the short. You would need to go over the wiring on your truck and trailer to find the cut or exposed wire and fix as needed. Corrosion can also...
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  • Will Euro 7-Way to 4-Way Adapter Fit 1986 Mercedes 300GD W460 G-Wagon
  • Yes, the Adapter part # 118710 that you referenced would be exactly what you are looking for. The 7-way of the connector is pinned out exactly like what you have on your W460 so then the 4-way of the adapter would work like normal.
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  • How to Wire Up a Trailer with a Breakaway Battery and Auxiliary Battery to Prevent Backfeeding
  • Typically people will let the breakaway battery run the breakaway system and then would use the accessory battery to power the interior lights etc. This tends to work the best since your breakaway battery needs to always be charged and interior lights could potentially drain the battery of the trailer. Since when you charge two batteries on the same circuit you have the potential to end up draining both the solution is to install a diode on the circuit to prevent this like the part #...
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  • Use Circuit Tester to Find Wire Functions to Install Trailer Wiring Harness on 1992 Geo Tracker
  • Hardwire trailer wiring harnesses such as # C56175 will require using a circuit tester such as # 3808 to determine the functions of the tail light wires on your 1992 Geo Tracker. You could also use # 119178KIT which comes with a little circuit tester. On these harnesses the red wire is for brake lights, yellow is for left turn, green is for right turn, brown is for tail lights, and white is ground. After you verify the functions of the wires on your Tracker installation will be easy!
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  • Troubleshooting Trailer Blinker that Locks Up Trailer Brakes In Sync with Circuit Flashing
  • What is happening is that the left blinker circuit is shorting out on the brake output circuit which is causing the brakes to apply in sync with the blinkers. I imagine the brakes are applying very harshly now too as the brake assemblies are getting a full 12 volts when the brake lights come on. Sounds like you have some wiring issues on the trailer that need to be addressed. Best bet is to go over all of the wiring looking for any cut or exposed wire and fix as necessary.
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  • Connecting Wires of 37175 4-Pole to 6-Way Adapter to Install Brake Controller on 2011 Ford F150
  • The # 4 pole on the 37175 would plug directly into the existing 4 pole on your truck, leaving three remaining wires. The blue wire carries the output voltage from the brake controller, the red wire carries 12-volt auxiliary power from the vehicle to the trailer and the white wire is a ground. The red and blue wires would be lengthened and ran under the vehicle up to the engine compartment. The blue wire would run through the firewall and connect to the blue wire exiting the rear of the...
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  • Does Camco RV Power Defender Circuit Analyzer Dogbone CAM55313 Correct Miswired Outlets
  • The Camco RV Power Defender Circuit Analyzer Dogbone # CAM55313 will tell you if the power outlet at an RV park is wired properly to prevent damage to the connected RV's electrics, but it does not correct for any mis-wired outlets. It is a warning device only. My contact at Camco confirmed that when three of the four LED indicator lights are lit yellow on the main body of the unit the outlet is wired correctly. They also offer a similar unit, their Power Defender Voltage Analyzer...
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  • Does 12 Volt Wire on Trailer Side 7-Way have to Be Connected if Trailer Does Not Need 12 Volt Power
  • On a 7-Way trailer connector such as # H20046 the 12 volt wire would connect to any accessory that would need 12 volt power such as a trailer mounted battery or a jack in some cases. You usually do not see them on boat trailers. If you don't have anything on the trailer that needs 12 volt power you can just cap off that wire and stow it out of the way.
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  • 5-Way Trailer Wiring Harness Recommendation for a 2008 BMW X5
  • Since all of the trailer wiring options we have for your 2008 BMW X5 are hardwire options the best solution will be to use the # 119177 which is also a hardwire option but it comes with a 5-way that you can wire the reverse light circuit to. This way you wouldn't have to deal with any adapters.
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  • Troubleshooting Trailer Wiring Where Turn Signals and Hazards Work But Stoplights Dont
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • 7-Way Recommendation for Trailer to Install Reverse Light Circuit
  • Since you have a 7-way on your 2007 Toyota Tundra the best solution is going to be to replace the connector on your trailer with a matching 7-way like part # H20046 and then run the yellow wire of the 7-way to the reverse lights. Whenever possible we try to avoid adapters as they end up being just another component that can potentially cause a problem. The simpler the approach to wiring the better.
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  • Distance Between Mounting Holes on the Pollak 4-Way Round Connector
  • I grabbed a Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket, # PK11404, from our warehouse to measure and found the distance between the mounting holes on center is 1-3/4 inches. If you check out the picture I attached you will see that you would have to come up with a shackle type adapter to allow this connector to be used on your base plate.
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  • Where Does the Brake Controller Output Wire Terminate on a 2008 Dodge Ram without OEM 7-Way
  • On a 2008 Dodge Ram that did not come with a 7-Way trailer connector the brake controller output wire does not run all the way to the back of the truck. It stops at the connector that is located under the driver's side wheel well. I have linked a help article that covers this and other steps. But if you have a factory 7-Way then you would not need to worry about that because the wire would be run all the way back.
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  • 5-Way Round Vehicle and Trailer Side Connectors for Use with a Motorcycle
  • Motorcycles have unique trailer connectors that are a little different than what is on other vehicles. You could wire in connector # PK11502 and it will likely be a match to what is on your trailer. Or you could also get the matching trailer side connector, # PK11501, so that the bike side and trailer side are for sure compatible. I have linked videos for both parts for you.
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  • Wiring a 7-Way Trailer Connector if Existing Wire Colors Don't Match
  • The wire colors/functions listed on the page for vehicle side 7-Pole connector # PK12703 are just the most common ones. There is no standard for wiring color and function on vehicles or trailers. To wire up a new connector you will need to do so by function. This means you will need to know what each of the wires does. On the trailer side you can either follow each wire back to see where it terminates and wire it to the 7-Way accordingly or you can run power through each wire using a...
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  • Troubleshooting Running Light Circuit on 2015 Ford F-150 4-Way Not Working
  • Check the fuses under the hood of your 2015 Ford F-150. Sounds like the trailer running light circuit has blown. Or if the running lights on the truck stopped working check the truck running light circuit as well.
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  • Trailer Wiring Solution for a 2014 BMW M235i
  • For vehicles that don't have trailer wiring fits listed for them the best option we have is actually the ZCI # 119250KIT which doesn't require any hardwiring and uses sensors in the connectors of the wires instead of splices. You would need to run a power wire up to the positive post of your vehicle battery and this would work well for you.
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  • Will Male Pins of the Power Grip RV Power Cord Adapter # CAM55185 Carry Voltage When Not Plugged In
  • The design of the Power Grip RV Power Cord Adapter # CAM55185 is such that that the exposed male side wouldn't be carrying any current. The side that would be "hot" would be the female side if plugged in. This is intentional so as to prevent electrocution or fire. Basically the male side of this adapter plugs into an outlet which carries voltage and then the other side of the adapter (the female side) plugs into the RV to supply power without the risk of shorting the adapter out.
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  • Wire Gauge Sizes in Epicord 7-Way Molded Trailer Plug with Junction Box
  • The wire gauges in the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 are as follows: White = 10 Black = 10 Yellow = 14 Green = 14 Red = 14 Brown = 14 Blue = 12 The wire gauge in the Epicord # 277-000141 changes with different functions of the wires. Signal wires, like yellow, green, red, and brown, draw less amperage so they use a lighter gauge wire. Heavier gauge wire is used for functions like the brake signal, ground, and 12V power because they carry...
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  • Trailer Brakes Lock Up When 2016 Jeep Grand Cherokee is In Reverse
  • My first question is does the trailer have electric brakes or hydraulic surge brakes? If it has surge brakes and an electric reverse lockout then that would mean that the center pin on your 2016 Jeep Grand Cherokee is not connected to a reverse light circuit. If it has electric brakes then the brake output circuit on the trailer is connected to the center pin. To fix this problem you just have to have the right wires going to the right pins on both the vehicle side and trailer side connectors....
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  • Troubleshooting Trailer Lights That Won't Work When Vehicle Headlights Are On
  • When strange things happen to trailer lighting very often the cause is simply a weak ground connection at the vehicle wiring harness or at the trailer's main wiring ground. A weak ground will allow certain light functions to work properly while others will not. Usually the problem shows up when you turn on the tow vehicle headlights; this activates the trailer running lights which tend to draw the most current (since they remain on continuously). Check the white ground wire on your...
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  • 7-Way to 4-Way Trailer Adapter Recommendation for a 2007 Toyota Tacoma
  • Sounds like you have a 7-way installed at the rear of your 2007 Toyota Tacoma like the # 37185 and would need an adapter like the part # PK12716 to give you a 4 way. Check out the install video I attached for more info as well.
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  • Trailer 7-Way Connector Tester Recommendation
  • We do have the Hopkins Trailer Connector tester part # HM50928 which will allow you to plug your trailer's 7-way into it and test all of the circuits easily. I attached a review video for this product for you to check out as well.
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  • Parts Needed to Install Brake Controller On 1996 Ford F150 w/ 4-Pole Trailer Conenctor
  • I'm not able to access your shopping cart, but I am able to see the various products you checked out before you submitted your question, and I'd be happy to run through everything with you. For a brake controller, the Tekonsha Prodigy P2, part # 90885 would be an excellent choice. The P2 provides safe and predictable braking in a unit that's easy to set up and easy to use. You'll need the # 3035-P brake control wiring adapter which will allow you to plug the controller in under the dash. At...
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  • Troubleshooting Trailer Wiring that Stops Working When Headlights are Turned On
  • Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem.
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  • Can a 4-Way Be Wired to a Trailer with 3 White Wires
  • Based on the colors of the wires you have you could pretty easily wire a 4-way to your trailer. The part # A35W42B would work well. You would just need to match the colors of the connector to the wiring of your trailer. All of the whites would need to run to the single white wire of the 4-way but the rest of the wires would match right up. The white is ground. The brown is running light. The green is right turn/stop. The yellow is left turn/stop.
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  • What Type of Power Cord Attaches to the Epicord 30 Amp Twist Lock Power Inlet # 277-000137
  • Based on what you described it sounds like your trailer has a 30 amp power cord like what the Epicord 30 Amp Twist Lock Power Inlet # 277-000137 is designed to attach to. I attached a picture of the what is designed to attach to the # 277-000137 for you to check out as well.
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  • Troubleshooting Trailer Lights Not Functioning Properly, Only Right Side Light Comes On
  • It sounds like your issues are the results of a grounding or incorrect wiring issue on your trailer, but we can run through a few tests to be sure this is the cause of the problem. Let's start by testing the new 4-Way wiring connector, like # 18004 that you referenced, on your vehicle. You can use a circuit tester like # 40376 to test for correct function at the connector. The green wire should carry the right turn and stop signal, the yellow wire carries the left turn and stop signal,...
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  • Difference Between Hopkins 4 Pole to 6 Way Trailer Connector Adapter 37175 and 47175
  • There is no difference between the # 37175 and the 47175, it's the same exact part. Our part number for the Hopkins 4 pole to 6 way trailer connector adapter is # 37175, and Hopkins uses 47175 as the part number.
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