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Expert Answers about Wiring


  • Electric Brakes Stop Working During Hard Braking on a Triple Axle Toy Hauler
  • It sounds like there is a short to ground somewhere. I would guess the short is on the trailer, especially if this is a new problem. The OL code indicates an overload and the SH code indicates a short on the electric brake output wire. The first step is to inspect the trailer wiring as much as possible between the connector on the trailer and the brake assemblies. Look for any pinched, frayed or damaged sections of wire that could be touching the frame. Since the brakes were recently...
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  • Troubleshooting Right Turn Circuit on Boat Trailer Pulled by 2012 Honda Pilot
  • On the Hopkins # 47345 adapter, the 'TM' lamp is for the running light circuit. To troubleshoot, use a circuit tester like part # 40376 on the trailer connector on the vehicle. Test each pin while the right turn/ brake, left turn/ brake and running light circuits are activated. If all circuits are testing properly, then the wiring problem is on your trailer. Begin at the trailer connector itself. If it's dirty, corroded or damaged in any way, you'd might want to go ahead and replace...
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  • Adding 4-Pole Trailer Connector to 2009 GMC Sierra Equipped with Factory 7-Way Connector
  • There's a few different ways you can do this. For the easiest choice, you can use a simple adapter like # PK12716. Simply plug it into the 7-way then plug the 4-pole connector for the trailer into the adapter. Another option would use the # 118384 4-pole connector. This 4-pole would plug inline between the vehicle wiring harness and the twist-in # PK11916 7-way. This would provide you with an always functioning 4-pole connector, and you wouldn't need to fool with an adapter.
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  • Solution for Backup Sensor Alerts on a 2014 BMW X5 When Carrying a Bike Rack
  • Yes it would, your 2014 BMW X5 will disable the backup alert system when it senses a trailer connected to the trailer wiring. So the load resistors in the 7-Way to 5-Way and 4-Way Trailer Adapter # TR20141 that you referenced would trick the vehicle into thinking a trailer is connected and and the sensors would not activate because of the brake controller. Another trick that people use with your vehicle is to tape over the sensors with masking tape.
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  • Trailer Wiring Harness Recommendation for a 2011 Malibu LTZ
  • Yes, the Tow Ready Wiring Harness part # 119179KIT that you referenced is confirmed to fit your 2011 Chevy Malibu LTZ. I attached installation instructions and an install video for this product for you to check out as well. The video shows a typical installation, the wire colors will be different for your vehicle.
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  • Trailer Wiring Harness Availability for a 2008 Lexus RX400h
  • Some vehicle manufacturers will run tow package wiring on the vehicles, but they will not include a trailer wiring harness if the vehicle is not ordered or purchased with the tow package. There is no aftermarket plug-in style trailer wiring harness for the 2008 Lexus RX400h. This may be a dealer only item if it exists. At this time, the only aftermarket wiring harnesses available for your vehicle are hard wire kits with a powered converter like part # 119190KIT. If you would prefer...
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  • Is there an Adapter to Go from a 4-Way Round Connector to a 6-Way Round Connector to Flat Tow
  • We do have a 4-Way round adapter but it goes to a 4-Way flat, # 47465. You could cut off the 4-Way flat end and wire in a 6-Way, # PK11609 for the vehicle end or # PK11604 for the trailer end, however your flat towing set up is arranged. We also have coiled kit # RM-164 which will allow you to replace the 6-Way end on the vehicle with a 4-Way round.
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  • Trailer Lights Not Working when Headlights are Turned On On a 2013 Ford Edge
  • There is one sure way to determine if the factory trailer wiring harness on your 2013 Ford Edge is pushing back enough power. You will need a multimeter such as # BTMT15. Have someone sit in the vehicle and go through the light functions while testing for amperage. You would also need to determine how many amps each light draws. Then with some simple math you can figure out if the trailer is drawing too much power to power the lights when the running lights are on. An easier way to...
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  • Trailer Wiring Harness for 2008 Audi Q7
  • If your 2008 Audi Q7 did not come with a trailer connector from the factory you can use the Curt universal-fit wiring harness # C56200KIT which is shown in the linked video being installed in an Audi Q5. The written instructions are also linked. Installation will be the same no matter where the battery is. Installation of this or any wiring harness will be simplified by use of a circuit tester such as # 40376 or # 3808 to confirm the function carried by each vehicle wire before making...
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  • Trailer Wiring Harness for a 2007 Kia Sedona
  • Even though you ordered a hardwire harness # 56146KIT it would still work on your 2007 Kia Sedona. You would just have to use a circuit tester, included with the kit, to test the tail light wires, and then attach the wiring harness wires accordingly. But there are T-connector wiring harnesses for your vehicle. You could use # 118410 which plugs in line with the vehicle tail light wiring. To testing required. But you will need to make a direct connection to the vehicle battery. This...
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  • Troubleshooting Trailer Blinkers Where When One is Activated the Other Blinks Dimly
  • We had this exact same problem in our shop the other day and the problem turned out to be that the grounds of the trailer light assemblies weren't sufficient. By grounding the light assemblies better the problem went away. You can also check to make sure that the main ground strap from the trailer connector that runs to the trailer frame is connected properly. If that does not fix the problem you can run the grounds from the assemblies straight to the main ground wire of the trailer...
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  • How to Secure the Tow Ready Wiring Harness to the Underside of a 2001 Lexus RX 300
  • The 4-Flat Universal Mounting Bracket # 118149 that you referenced would be an excellent bracket to use to secure the 4-way of the Tow Ready Wiring harness part # 118245 to your 2001 Lexus RX300. What I would recommend you use to secure the wires would be zip ties. You would just want to zip tie the wire harness to the underside of your vehicle avoiding moving parts that could pinch the wire and exhaust components that could melt it.
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  • Can Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P Be Used as a Wiring Harness Extension
  • The Spectro 4-Pole 12-Inch Car and Trailer End Loop # 9653P is a perfect solution for cases where trailer wiring is just a bit too short. We also offer a 4-foot # HM47115 from Hopkins.
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  • Testing Brake Magnets
  • I have attached a helpful article that explains how you can test your brake magnets to see if they need to be replaced. The article explains how you can perform 4 different tests to see if your magnets are working properly. You can use a digital multimeter like part # BTMT15, to make sure you are getting the correct amperage. Many times the cost of replacing the entire brake assembly is not much more than replacing the components such as the magnets.
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  • How to Use Quick Splice Connectors or 3M Scotchloks and Wiring Harness for 2014 Dodge ProMaster 3500
  • To use the quick splice connectors you will put the wire you want to splice into on the inside track of the connector. Then put the wire from the wiring harness # C56190 in the track next to it. Close the plastic clip and use some pliers to squeeze the connector to make the splice. I have included a link to a video that shows our installer using the connectors. Go to about the 56 second mark to see it in action. Be sure to test the wires first with a circuit tester such as # 3808. This...
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  • Location of Wiring Harness on 2009 Lexus RX 350
  • We have fitted trailer wiring harnesses on the 2nd Generation Lexus RX 350. Assuming the 3rd Generation Lexus 350 is similar, you will have to remove several interior panels in the rear storage compartment to access the vehicle’s taillight wiring harness connector. See the diagram I made which shows the vehicle’s taillight wiring harness connector's location, and the linked video on how to remove the panels. You will then plug in the T-One Vehicle Wiring Harness # 118478. This will give...
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  • Troubleshooting Right Stop/Turn Circuit Not Functioning on Trailer
  • First place I would check is the ground of the light assembly in question. If the assembly is not grounded properly it will not function properly. Some assemblies ground through the mounting hardware, you will want to make sure the assembly is attached to a clean metal surface. The next thing to check would be the trailer connectors for dirt or corrosion and clean as necessary. Usually this will be on the inside of the connector on the vehicle, but corrosion can be on the back of either...
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  • Parts Needed to Convert a 4-Way to a 7-Way
  • I have a better solution for you than that. If your trailer does not have trailer brakes all you would need is an Adapter 4 Pole to 7 Pole and 4 Pole # 37185. You would just plug your 4-way into the 4-way of the adapter and you would have a functioning 7-way. You would want to tape the rest of the wires up and out of the way. If your trailer has brakes you would instead need the Universal Installation Kit for Trailer Brake Controller # ETBC7. I attached installation instructions and...
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  • Is the Arcon Replacement RV Power Cord Plug w/ Folding Handle # AR18203 Rated for Outdoor Use
  • The Arcon Replacement RV Power Cord Plug w/ Folding Handle # AR18203 that you referenced is rated for use on an RV so yes, it can be used outside and is rated for that.
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  • Trailer Connector has 4 Pins But 5 Wires
  • I am a little confused as to were the connector is, on the truck or on the trailer. Brown wires are typically associated with running lights. If there are 2 wires coming out of that pin and we are talking about the trailer side then you have what is called a wishbone harness. It will still function exactly the same as a regular 4-wire 4-Way connector. It just has 2 running light wires to run to the 2 sides of the trailer to limit the amount of splicing you have to do. If we are talking...
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  • Troubleshooting Trailer Fuses Blowing on a 1992 Toyota Truck When Put in Reverse with a Trailer
  • Sounds like your taillights and trailer lights are overdrawing your 1992 Toyota Pickup and that is why the fuse is blowing. When you put your truck in reverse you have your foot on the brake which is activating the trailer brake lights as well as the truck brake lights, and then when the reverse lights of the truck come on additional amperage is being pulled and most likely causing the fuse to blow. What needs to happen is the amperage draw of your trailer needs to be reduced. The easiest...
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  • Curt Trailer Wiring Harness # 56146KIT Malfunction in 2003 Mercedes-Benz M-Class
  • Thank you for your purchases from etrailer. Based on your troubleshooting and testing efforts it does sound like the Curt converter # 56146KIT you have could be bad. Correct signals in but incorrect signals out usually means the converter is damaged. The exception is if your trailer uses super-efficient LED-type lights. These will often illuminate when standard bulbs do not simply from the small residual current that passes through the converter. If not I suggest you carefully check...
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  • Identifying Wire Functions to Install Hopkins 4 Pole to 5 Pole Trailer Wiring Adapter # 47515
  • The best and safest method for identifying vehicle wiring functions is to test the wire using a circuit tester such as # 40376. Vehicle manufacturers may change wire colors between production runs and so color alone is not a reliable method. You can apply your tester to the various taillight wires (while a helper safely places the vehicle in reverse to activate that circuit) to find the one that carries the reverse light signal. Once you identify the correct wire you can use the quick-splice...
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  • Troubleshooting Voltage Drop on Electric Brake Wire on Trailer with New Wiring
  • The first step I would take is to replace the 14 gauge wire for the electric brakes with either 10 or 12 gauge wire. It is not recommended to use wire smaller than 12 gauge on electric brake and battery charge circuits on trailers. The smaller gauge wire should not cause a significant voltage drop by itself, but it could easily overheat and cause problems in the future. The next step would be to inspect your ground connections. Be sure everything is grounded to a clean, bare metal surface....
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  • No 12V Power Or Trailer Brake Power To 7 Way Plug on 2007 GMC 2500HD
  • If both the 12V and trailer brake circuits on your 7-way have failed at or about the same time the most likely culprit is a corroded or damaged 7-way socket. You can inspect it for any signs of even very slight greenish or whitish discoloration on the contact surfaces. Check both sides of the 7-way. Some times if corrosion builds up it can actually bridge two circuits together, causing a short and malfunction of the affected circuits. If you find any evident corrosion clean or replace...
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  • What Gauge Are The Wires In The Bargman 7-Way Sealed Connector
  • I spoke with my contact at Bargman and you are correct on the sizes of the wires on the Bargman 7-Way Super Sealed Connector, part # 50-87-002. The White wire and Black wire are 10 gauge. The Blue wire is 12 gauge. The Brown, Yellow, Green, and Red wires are all 14 gauge.
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  • Is Computer Reprogramming Required to Install Curt Trailer Wiring on a 2013 Audi Q5
  • I spoke to my contact at Curt and he informed me that you would not need to reprogram or reflash the vehicle computer to install the Curt Wiring Harness part # 56200.
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  • Recommendedations To Change 4-Way Connector On Trailer To 7-Way Connector
  • It sounds like you want a permanent change from the 4-way connector to a 7-way connector on your trailer. We carry trailer-end 7-way connectors and the one I recommend is the Pollak Metal 7-Pole Connector, part # PK12702. This is a blade-style connector. If you have a round-pin connector on your vehicle I recommend part # PK11700. This would require cutting the 4-way connector off your trailer. You would need to test the wires on the trailer using a 12V power source to see what...
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  • Which Replacement Hub/Drums and Brake Assemblies Needed for 1985 Monarch Horse Trailer
  • As a first step, you'd want to determine the reference numbers from the inner and outer wheel bearings and the wheel bolt pattern used by your current hub/drums. If the reference numbers aren't readable, you'd need to use a digital caliper on the surfaces of the spindle where the inner and outer bearing and the grease seal ride. With this information, I can recommend a replacement drum. To recommend replacement brake assemblies, I'd need to know the inside diameter and depth of your brake drums.
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  • How to Install Hopkins Hardwire Trailer Wiring Harness on a 2010 Dodge Grand Caravan
  • There are no vehicle specific instructions for wiring harness # HM48895 because it is a universal hardwire type of harness that fits many vehicles. Basically you will use a circuit tester such as # 3808 to test the vehicle tail light wiring. Once you know what the wires do on the vehicle you can splice them into the harness. On this harness, the white wire is ground and attaches to a clean bare metal surface. Brown is for running lights, yellow is left turn signal, red is brake lights....
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  • Troubleshooting 12 Volt Power Circuit not Functioning on 7-Way After Re-Wire
  • There could be corrosion or dirt inside your 7-way that needs to be cleaned out before all of the circuits of the 7-way will activate. That's the most common reason circuits on a 7-way won't function properly. You can test this easily by using a circuit tester like our part # 3808 to test the wires that feed into the 7-way on the circuits that aren't functioning. If the wires have voltage but not the pins the problem is corrosion or dirt on the inside or outside of the connector. Also,...
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  • Troubleshooting Left and Right Blinkers that Blink Together
  • What's happening is that your left/stop turn circuit is shorting out to your right stop/turn circuit and when one circuit is getting activated the other is as well due to the short. The best way to fix this would be go over all of the connections you made looking for any exposed wire and fix as necessary. I attached an FAQ on troubleshooting 4-way installs for you to check out as well.
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  • 4-Pole Trailer Wiring Harness for 2014 Audi Q5
  • Trailer wiring harnesses are offered in both powered and non-powered types, as you note. Powered converters offer the advantage of better isolation of the trailer lights' current demand from the tow vehicle's wiring. Non-powered harnesses use the tow vehicle tail light wiring to deliver the actual current needed by the trailer lights. In some cases this could lead to overload of the vehicle's wiring. For your 2014 Audi Q5 I suggest the powered converter # 119190KIT from Tow Ready. This...
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  • Trailer Brakes Work Fine when Testing Parked but Brake Controller Work Intermittently when Moving
  • I think you are on the right track with the ground. When there is intermittent function like this it is almost always a ground issue. When traveling there is a certain degree of bending and flexing on the trailer that would be difficult to simulate at home. There are some tests you can perform at home to determine where the issue is. And you should not have to spend any money to perform these tests. In the truck cab you will need to sever the blue wire several inches from the back of...
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  • Trailer Wiring Harness Recommendation for the 2013 Mercedes GLK 350
  • For your 2013 Mercedes GLK 350 the correct wiring harness would be the Curt Wiring Harness part # C56200KIT.
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  • How to Tap into Reverse Light Wire on a 2008 Cadillac SRX to Install 4-Way to 5-Way Adapter 47515
  • Getting to the wiring for the reverse light if the reverse light is in a hatch such as on your 2008 Cadillac SRX can be challenging. But that wiring has to exit the hatch and go into the rest of the vehicle so you should be able to locate the wire at that point. This is normally at the top of the hatch. The wires will all be covered so you will have to cut a slit in the protective cover to access the wires. Then use a circuit tester such as # 3808 to test the wires to find the reverse light...
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  • Gooseneck Trailer Running Lights Stay On All the Time When Connected to Truck
  • The likely culprit is a dirty or corroded connector on either the trailer or the truck. Make sure each is clean and free of corrosion inside and out. Corrosion could be causing a short between the running light circuit and the 12 volt circuit in the trailer connector. If that does not solve the issue then make sure the circuit for running lights on the truck side is in the 11 oclock position if looking at the pins. And on the trailer side make sure the running light wire is in the 1...
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  • Troubleshooting Running Light Circuit on 7-way of 2010 Ford F350 Diesel
  • Which fuse box did you check? In addition to the box under the dash, there's also fuses located in the power distribution box under the hood. You'll want to check the fuses or relays in the following locations: 20, 21, 42 and 55. It's not always easy to determine if the fuse is blown by looking at it from the top. It's easier to tell if you can remove the fuse and give it a side view. You'll also want to rule out the connector itself as being the problem. Unplug the wiring harness from...
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  • Is Taillight Converter Needed for 2002 Infiniti I35
  • There are two reasons why a wiring converter like the # 119178KIT would be used on a given vehicle. If the tow vehicle uses a three wire system like your I35, with separate bulbs for the turn signals, and brake/running lights, a converter is used to combine the brake lamps and turn signals onto the same circuit. A vehicle that has a 3 wire system is also referred to as having a 'separate' taillight set-up. A two wire system that has the brake lamp and turn signals combined onto one circuit...
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  • Troubleshooting a Curt 4-Way Harness with No Output Voltage
  • What you will want to do is test the wires going into the box of the Curt Wiring Harness part # 56146KIT for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself out and would need to be replaced. Before you replace it you...
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  • Solution for Towing a Trailer with Round 6-way on Vehicle and 7-Way on Trailer
  • Yes, check out the Hopkins 6 Pole to 7 Pole Adapter part # 47435. This is an adapter that will go from a 6-way to a 7-way.
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  • 4-Way Recommendation for a 1999 GMC Sierra to Power a LED Bar
  • I would use the Curt Wiring Harness part # C55384. This will plug inline with the 7-way on your 1999 GMC Sierra and will provide you with a 4-way you could use to install your LED bar and would not interfere with your 7-way. If you don't have any trailer connectors on your vehicle you would need to install the Tow Ready Wiring Harness part # 119147KIT.
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  • Troubleshooting Stop/Turn Signals Not Functioning on a 2005 Porsche Cayenne with LED Trailer Lights
  • First thing you want to do is test the 7-way on your 2005 Porsche Cayenne with a circuit tester like our part # 3808 to determine if the lighting functions are working correctly on the connector. See the attached picture to see what pin carries which circuit. You will want to have a buddy apply the different taillight functions of your Cayenne and then using the circuit tester check the appropriate pin for voltage. If this check out then you know the vehicle wiring is not the problem. Have...
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  • 4-Way to 7-Way Adapter For a 2010 Ford Escape
  • We have exactly what you need. Check out part # 37185. This is a 4-way to 7- and 4-way adapter. You simply plug your existing 4-flat connector into the 4-flat connector on this adapter, mount the 7-way and 4-way socket and ground the white wire to the vehicle frame. The additional wires are for 12 volt power (black), electric brakes (blue), reverse lights (purple). If you do not need those functions at this time, then you can just tape those wires out of the way. On the Ford Escape,...
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  • Brake Controller Recommendation for a 2005 Chevy Silverado with Factory 7-Way Connector
  • In order to activate the electric trailer brakes on the trailer you will need a brake controller for your 2005 Chevy Silverado. Since you have a factory installed 7-Way already, installing a brake controller will be easy. First for a brake controller I recommend the P2 # 90885. It is one of our most popular controllers because it is easy to set up and use and because it is reliable. You will also need wiring harness # 3015-P to plug the controller into the junction box under the...
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  • What Type of Trailer Wiring Should I Install on a 2014 Infiniti QX60
  • I am glad to hear our videos helped you install your trailer hitch. Many people want to do their own work themselves and we like to help as much as we can. There are two common types of trailer connectors, the 4-way flat connector like part # 18172 and a 7-way RV style connector like part # PK11893 (see photo). The type of trailer wiring that you would install on your 2014 Infiniti QX60 will depend on the type of connector on the trailer you will be towing. If you do not have a trailer...
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  • How to Charge an Extra Battery in the Truck Bed on My 2012 Chevrolet Silverado While Driving
  • The best option would be to use a charger like part # CTEK56158, and charge the battery when shore power is available, or use the charger in conjunction with an inverter part # 02294 when the truck is running. If you wanted to use the factory 7-way you could use the 12-Volt Power Inverter Adapter, # HM11147650, to provide DC power to the inverter. If the DC outlet in your truck is ran directly off of the trucks charging system, then you could use it to maintain a battery that is fully...
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  • Trailer Wiring to Allow Trailer Battery to Charge from Tow Vehicle
  • The Hopkins 7-Way Molded Trailer Wire Connector # H20046 could be used to connect your trailer's battery to your tow vehicle by using just the black (+12V) and white (ground) wires. However, the wiring in a tow vehicle cannot really deliver enough amperage to charge a trailer battery. These +12V feeds are intended to maintain a charged battery, but not to charge a depleted one. Battery chargers such as the CTEK # CTEK56864 include several wiring harnesses one of which could be installed...
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  • How To Wire In a 7-way to Replace a Boat Trailer 5-Way Flat
  • You definitely could install the 7-Way Molded Trailer Wire Connector # H20046 in place of the 5-way that is installed on your trailer currently. The colors wouldn't match up exactly. White would go to white, you would run both brown wires to the single green wire of the 7-way. Yellow of your trailer would go to the red wire of the 7-way, and green of the trailer wiring would go to brown of the 7-way. Now without knowing where the red wires of the 5-way go it's hard to say for certain....
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  • Parts Needed To Convert Trailer Surge Brakes To Electric Brakes
  • There are a few things to consider when converting the surge brakes to electric on your trailer. I have attached a helpful article that explains what is needed to add electric brakes to a trailer. The first thing you will need to know is the weight rating of your axle. This should be on a sticker or plate. Next you will want to select hub/drum assemblies that use the same bearings as you are currently using. The best way to find that information is to remove the bearings and seals from...
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  • Trailer Adapter to Convert 4-Pole Flat to 7-Way RV-Style Blade Connector
  • You found the correct adapter to convert your F-150's 4-pole flat trailer connector to a combination 4-pole and 7-pole to allow you to tow two types of trailers with different wiring connectors. Your existing 4-pole will simply plug in to the female connector on the Hopkins # 37185. The included mounting bracket and hardware will allow you to install this where you prefer. If you ever want to add a trailer brake controller for use with trailers that have electric brakes the extra wire...
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  • Trailer Lights are Dim Just on One Side of the Trailer
  • This is likely a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
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  • Instruction Manual for Tekonsha Trailer Wiring Circuit Tester # 8010
  • We can certainly help you with that. I've placed a link to the instructions off to the right hand side of this page. I'll also send you a .pdf copy in a separate email.
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  • Replacement 5-Way Recommendation to Replace a 5-Way that Had 7-Wires Run to It
  • What you have is a 5-way trailer connector with a wishbone running light circuit and 5th auxiliary circuit. The closest thing we have would be the Wishbone 5-way Part # A25W5B. This has a wishboned running light circuit, but the 5th circuit is not. You can still make this work though. You just need to run both of the red wires from your trailer wiring into one butt connector and then run the other side of the butt connector to the blue wire of the # A25WB.
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  • Will the Tow Ready Euro LED Trailer Light Adapter Work on a Trailer with Mixed Incandescent and LED
  • Yes, the 7-Way to 5-Way and 4-Way Trailer Adapter for VW, Audi and Porsche Towing Trailers with LED Lights # TR20141 will work on a trailer with a mix of incandescent and LED tail lights so it should work well for you.
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  • Why Won't a Cam Am Trailer for a Spyder Work with a Honda Goldwing
  • Motorcycles typically have separate turn signals and brake light circuits. The Spyder might have combined brake lights and turn signals which could explain why the trailer made by the same company that makes the Spyder works with it and not the Honda. It could also be that there isn't enough load from the LED lights for the wiring harness on the Honda to recognize that something is drawing power. In this case you would need to add load resistors, # P230004A-2, on each affected circuit....
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  • Tail Light Wiring Harness Recommendation for a 2003 Mercedes-Benz E500
  • I have a tail light wiring harness that should work with your 2003 Mercedes-Benz E500, but Curt does not have any recommended harnesses, so you do not want to use part # 56146KIT. According to my contact at Tow Ready, their Heavy-Duty Modulite Wiring Harness, # 119190KIT, should work. They have not specifically tested this harness with the 2003 E500, but he said the tail light wiring in that vehicle is not very different that other Mercedes models and part # 119190KIT is the harness...
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  • Troubleshooting Right Turn Lamp Circuit on Trailer Towed By 2004 Chevy Silverado
  • If everything but the right turn signal on the trailer works, you'd start by using a circuit tester like part # 40376 on the trailer connector on the tow vehicle as each lighting function, right turn, left turn, running light and brakes are activated. This will help you determine if the problem is in the vehicle or the trailer wiring. The wiring help article will show you which pin on a trailer connector controls which function. If the pin for the right turn signal on the trailer connector...
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  • Adapter to Convert Vehicle 4-Pole Flat Vehicle Connector to 7-Way RV-Style Trailer Connector
  • We do offer adapters to allow a vehicle with one type of connector (in this case a 4-pole) to connect to a trailer that uses a 7-way RV-type blade connector. TowReady offers their # 30717 which includes a 4-pole flat connector that will plug in to your vehicle harness and a surface-mount 7-way connector intended to accept the 7-way plug on your pop-up. If you prefer a bracket-mount connector you can instead use # C57674 from Curt, which includes a mounting bracket for the 7-way and also...
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  • Installing Trailer Wiring Harness Part #119190 on a 2013 VW Tiguan
  • Some vehicles combine stop and tail light functions onto 1 circuit and then also have an additional tail light function wire that is independent of the stop (such as your 2013 VW Tiguan). These vehicles will require that you attach the trailer light power module red “stop” wire to the same combined circuit on the vehicle and then attach the brown “tail light” circuit to the independent circuit on the vehicle.
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  • 7-Way Trailer End Connectors
  • We have a few 7-way trailer side connectors that may work for you. If you are looking for a 7-way round pin adapter, I recommend an adapter like the Pollak 7-Pole Round Pin Trailer Wiring Connector, part # PK11700. If you are looking for the 7-way like the Pollak 7-Pole RV-Style Trailer Connector, you would order part # PK12706. I have attached a link to our product page that has the trailer side connectors you can choose from. Just use the filters on the left side of the attached page...
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  • Wiring New 7-Way Trailer Plug on Trailer That Used Wishbone Harness on 4-Pole
  • The easiest way to wire in a 7-way plug on your trailer that currently has a 4-pole wishbone harness is to use a junction box like # 38656 from Spectro. Your trailer that has a wishbone harness has two separate running light wires (dual brown wires) that allow you to connect both sides' running lights without need to run a running light jumper wire between the two sides of the trailer. The junction box will provide a handy and weatherproof connection point to wire together the trailer's...
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  • Wiring US 4-Pole Trailer Connector to For Trailer with European 7-way
  • I am not aware of the existence of an adapter, but one could be easily constructed. You will need to find a vehicle-side socket to receive the plug from your trailer. We do not carry them, so you will need to obtain one locally. You will also need a vehicle to vehicle taillight converter like part # 118158 and a trailer side 4-pole like part # 18004. You would then wire the converter as shown in the diagram I provided. Using this adapter will separate the turn signal back out so that...
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  • Trailer Brakes Only Work when Interior Light Switch is On on Horse Trailer
  • With trailer wiring, you can't make any assumptions. The wires have to be tested to determine the functions. An easy way to do this would be to use a separate 12 volt battery and apply power to each wire on the trailer and then see what turns on. Then wire up the trailer connector accordingly. There may be breakaway system that is wired in with the 12 volt circuit from the trailer connector so when the switch is off it basically closes off that circuit. That would explain why the brake...
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  • Can Power Wire for Trailer Wiring Harness be Connected to 12 Volt Outlet on 2013 Volkswagen Tiguan
  • No. The issue is that wiring harnesses # 119190 or # 119190KIT are tested and rated for a connection to the battery only. Installing them using any other method could cause undesired operation. Also, if connected to a 12 volt outlet, you will lose that level of circuit protection between your 2013 Volkswagen Tiguan and the trailer. Routing the wire is just time-consuming but not really difficult. I have included a link to a help article with tips on routing the power wire for you.
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  • Troubleshooting Trailer Running Light Circuit Fuse Blowing with Trailer Connected 2005 Chevy Tahoe
  • Sounds like the running light circuit is drawing more power than the trailer running light circuit of your 2005 Chevy Tahoe can handle. The best solution for this is to swap some(or all) of your running lights on your trailer for LEDs. LEDs draw a fraction of what an incandescent bulb draws. I attached a page that has all of our LED trailer lights for you to check out. There could also be a short on the running light circuit of your trailer. Start at the connector and clean/fix any...
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  • Replacement 7-Way Vehicle Socket for 2005 GMC Sierra
  • The 7-way socket you referenced, Pollak # PK11893, connects to your vehicle with a round standard U.S. Car connector. This is an exact OEM replacement for the GMC Sierra. If you wish to have flexibility to connect to trailers that use a 4-pole flat connector you can instead consider one of the 4- and 7-way connectors shown on the link provided. These plug in to the truck in the same way but provide two connector options. Several include a length of wiring, such as Tow Ready # 20119, which...
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  • Troubleshooting a Weak Ground Issue on a Tent Trailer
  • First thing you need to do is thoroughly clean the trailer connector on your tow vehicle and trailer. Next, what I would recommend you do is check the ground strap that runs from the trailer connector to the trailer frame. I would make sure that wire is also making good contact to an unpainted metal surface. If you can't get your lights to ground decently to the trailer frame you can also run them both back to the main ground wire I just mentioned. I attached an FAQ on trailer wiring...
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  • Will Tow Ready Adapter w/ Lamp-Out Sensor Bypass # 20142 Work on 2005 Land Rover LR3
  • The Tow Ready Adapter # 20142 is intended to work on a range of European import vehicles including your Land Rover LR3. It is not a vehicle brand-specific item. According to my contact at TowReady this item should operate as intended on your LR3 to prevent low-current draw LED trailer lighting from triggering bad bulb error messages on your LR3's dash display. My contact has had no reports of issues with this item used in Land Rovers. Before installing this adapter it is suggested...
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  • Options for 16 Gauge Wire to Power a 12 Volt Spot Sprayer in Bed of 2012 Ford F-150
  • We carry different types of 16 gauge wire. We have bonded 4-Wire, # 16-4B-1, jacketed 4 wire, # DW03240-1, bonded 3-Wire, # 16-3B-1, and single wire # 16-1-1. Each of these are available in increments of 1 foot. So if you needed 8 feet you would enter 8 in the quantity box for an 8 foot length of wire. I would over estimate it because it is better to have too much wire than not enough. You also might be interested in some heat shrink tubing # DW05744-10 to keep the splices water tight.
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  • Old Trailer Wiring 5-Way had 6 Wires But New 5-Way Has 5 Wires
  • The trailer connector that you had is what is called a wishbone harness. It has 2 running light wires so you do not have to run a jumper wire for running lights from one side of the trailer to the other. Wesbar harness # W002290 is an example of a wishbone 5-Way. All you have to do is connect the 2 running light wires from the trailer wiring together and then to the brown wire on the new harness. Or, if you are replacing all the wiring, you would run a jumper wire from one side of the...
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  • Brake Controller Has Power But Trailer Brakes Do Not Work
  • There are some tests you can do to determine where the problem is: brake controller, truck, or trailer. First, in the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # 3808 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override or brake pedal. If it shows power at idle then there is something wrong with the controller and it will need to be...
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  • Installation Instructions for Tow Ready Custom Fit Vehicle Wiring Kit # 119179KIT on 2014 Kia Soul
  • I do not any vehicle specific instructions for the installation of the 119179KIT wiring kit. However, I do have a video showing this kit's installation on a 2013 Kia Soul (see link). That said, I would recommend a custom harness like the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56220 for the 2014 Kia Soul with LED lights. If you do not have LED tail lights you will need harness # 118431. This custom-fit T-connector plugs into your Soul's wiring...
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  • Using 6-Way Round to 7-Way Adapter and Trailer Lights Flash when Brake Pedal is Released
  • On a 6-Way round trailer connector the brake lights and turn signals should already be combined on the same circuit, one for each side of the trailer. So it would not matter if the RV had separate turn signals and brake lights. That is unless someone wired one in and didn't know that trailers use combined brake lights and turn signals. Also, if the hazards are turned on then the brake/turn signals on the trailer will just flash. Use a circuit tester such as # 3808 to test the functions...
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  • Installing a Trailer Brake Controller on a 2006 Ford F-150 without Factory Tow Package
  • The 2006 Ford F-150 should have that port under the dash for a brake controller even if it doesn't have the factory tow package. You just have to make sure that the fuses related to it are in place. Use the truck owners manual to find the locations of any fuses and relays that may be required. Relays will need to be obtained from a Ford dealer if required and not present. If the truck has a factory 4-Way connector but not a 7-Way you will also need # 37185. I have included a link to...
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  • Connectors to Power an Electric Trailer Winch from a Vehicle Battery
  • Pollak 7-Way to 12 volt adapter # PK11896 can handle a 20 to 30 amp power draw but the limiting factor will be if the 7-Way on the vehicle is rated high enough as well. Check the fuse for the 12 volt circuit for the tow package trailer connector to make sure it is also rated high enough. Using an adapter like this is not traditionally how an electric winch is powered. It should have its own connector separate from the trailer connector. We have a help article that covers the different...
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  • Trailer Lights Do Not Work When Headlights Are Turned On on a 2011 Jeep Compass
  • Yes, I believe that that corroded bulb is something that is affecting the lights on the trailer. There is definitely 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...
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  • Troubleshooting Trailer Running Lights Not Functioning on a 2009 Honda Pilot
  • Depends on the amperage draw of your trailer running lights and what the license plate light circuit or running light circuit of your 2009 Honda Pilot is rated for. If the taillight circuit of your Pilot can handle the additional draw of your trailer running lights you might be okay for a temporary situation like getting back home so that you can fix it. But I would not recommend this as a permanent solution as you could blow some fuses or damage wiring. You might first check the trailer...
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  • Wiring Up a 7-Way # 20246 to a Trailer without a Reverse Light Circuit
  • The center pin of the 7-way is the reverse light circuit, if your trailer does not have the need for a reverse light circuit then you do not have to use it. You would just connect all of the other wires and leave that one unused. To see how a 7-way typically gets wire up check out the picture I attached. You will want to wire the leads of the # 20246 by function to the trailer wiring. The yellow wire of the 7-Way # 20246 would not be used as it goes to the center pole.
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  • Right Side Brake Lights and Turn Signal Do Not Work on the Trailer
  • It sounds like your problem may be limited to just one circuit - the wire that carries the right turn signal and brake light. To begin testing, I recommend checking the vehicle side and trailer side connectors for any signs of corrosion or damage and repair as needed. If the connectors look fine, I would test the vehicle side trailer connector with a circuit tester, like part # 40376, to make sure the vehicle is sending power to the trailer (see video). I would test each pin as a helper...
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  • Troubleshooting Trailer Taillight that Stays Dimly Lit When Connected to Tow Vehicle
  • It sounds like your converter has shorted out like you suspected. Typically when a converter is used for trailer wiring and then one of the circuits stays on all the time the problem is that the converter has gone out. To test this you can use a circuit tester like our part # 3808 to test the input side of the converter for the correct voltage and then test the output side of the converter to see if everything is going in and out of the converter like it is supposed to. I suspect that...
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  • Troubleshooting Trailer Wiring Harness # 56146KIT Installation in 2014 Dodge Grand Caravan
  • Thank you for your purchases from etrailer. I suggest you re-check your ground wire connection. It can happen that a weak ground will pass enough current for some light functions but not others. Turn signals that blink on and off will draw less power than the brakes, which remain illuminated as long as you step on the pedal. You can try sanding off any paint/primer that may remain on the grounding point to enable a better connection, or you can relocate the ground terminal to a new spot...
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  • Troubleshooting Running Light On Trailer Hooked Up To 2007 Toyota RAV4
  • Since you said recently this problem has been happening, I suspect the problem may be as simple as a loose ground wire or one that has a short. I would first check all of the wire connections on the trailer to make sure there is no build-up of corrosion or a broken wire. If everything checks out okay I would unplug the harness from the vehicle and using a circuit tester like part # 3808, check all of the pins on the vehicle harness for function to see if there is an issue on the vehicle...
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  • Installing 7-way Adapter on Lexus Hybrid to Install Tekonsha RF Brake Controller part # 90250
  • I checked your order notes and it looks like you bought the # 30717 as well as the Tekonsha Prodigy RF Brake Controller part # 90250. Since you bought the # 30717 to let you install and use the # 90250 brake controller the only wire you need to run to install the 7 way adapter is the power wire. All you need to do is run that black wire from the 7-way to the positive battery post of the battery through a 40 amp breaker like the part # 9510 on your vehicle. This will bypass all the wiring...
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  • How to Determine the Functions of Wire Colors on a 1997 Chevy C/K 3500 Series Pickup Truck
  • You are going to have to use a circuit tester such as # 3808 if needed to determine the function of each of the wires in order to install the new connector. Manufacturers can use any color wire they want because there is no standard to follow. Black could be 12 volt power but it is not always. And green could be right turn and brake lights, but not always. The only way to know for sure is to test the wires.
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  • Trailer Connector for 2012 Jeep Wrangler Unlimited with 4-pole round Trailer Connector
  • I'd begin by installing the Tow Ready T-One Vehicle Wiring Harness, part # 118416. From that point, you can construct an adapter using the following parts: Pollak Vehicle Side 4-Pole Round Trailer Connectors, # PK11410 4-Pole Flat Trailer End, # 18004 4-Pole Trailer Connector Mounting Bracket # HM48605 Or, you could simply cut off the 4-pole flat plug of the # 118416 and use the # PK11410 and the # HM48605 bracket. However, this option wouldn't let you tow a trailer with a normal...
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  • Trailer Wiring Harness Recommendation for a 2006 BMW 33ci Coupe
  • I spoke to my contact at Curt and he said there are 3 potential solutions for your vehicle, but you will need to test the taillight wiring to determine what you would need. If all three of the circuits are on the same wire then you would want the Curt Wiring Harness part # C56201KIT, if the stop and turn are on the same circuit but the taillights are on a different wire then you would want the Curt Wiring Harness part # C56200KIT, and if all three of the circuits are on different wires...
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  • 2-Pole Male and Female Connector Needed for a Powerwinch RC30 Boat Trailer Winch
  • The Pollak 2-Pole Trailer Side Connector, # PK12800, and the Pollak 2-Pole Vehicle Side Connector, # PK12801, are made for each other and they would be excellent connectors for your Powerwinch RC30 trailer winch. If it is possible, I would recommend running 8 gauge wire because it will provide less resistance on the circuit and electric winches typically require thicker gauge wire. These are zinc die-cast connectors that are very durable. They are commonly used in heavy-duty applications...
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  • Converting 7-Way on VW Touareg to Tow Motorcycle Bunkhouse Camper w/ Separate Turn Signals
  • The problem you're having is that the signals coming out of your 7-way on the vehicle are converted. This means that the right turn/brake, two functions are combined on one circuit, and the left turn/brake is combined on another. Your trailer, however uses one wire for brake lamps, one for right turn and one for left turn. In order to get the taillights on that trailer to work they way you want them to, you'll need to use a Vehicle to Vehicle Taillight Converter, part # 118158 to 'split...
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  • Adding a 7-Way Trailer Connector to a 2008 Toyota Sequoia
  • Since you have the 4-way flat installed, I would recommend you install the brake controller 7 & 4 way installation kit, part # ETBC7. This kit includes all of the extra wires, circuit breakers and connectors needed to complete the installation of a 7-Way at the rear of your Sequoia while still retaining the use of the 4-way flat. The 4-way will plug into the back of the # ETBC7 and there will be 4 wires left to hardwire to the vehicle. White grounds to the vehicle frame. Purple goes...
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  • Availability of Complete Replacement Trailer Wiring Harness for 1989 Wells Cargo Enclosed Trailer
  • We do not offer complete OEM-style trailer wiring harnesses for specific trailers but we do carry all of the various connectors, plugs, sockets and other components required to re-wire a trailer from stem to stern. I have provided two links to our main pages for trailer connectors as well as two comprehensive articles on trailer wiring and troubleshooting.
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  • Would the Deluxe Round Electrical Cable Hatch part # 65841 fit in a 15-Amp Power Inlet # 14149
  • We do not carry the door in the picture that you referenced, but I did pull both the Deluxe Round Electrical Cable Hatch part # 65841 and the 15-Amp Power Inlet # 14149 and found that they are compatible. The # 14149 would fit in the # 65841. I took a couple pictures to show you that they are compatible.
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  • Wiring Harness for 2005 Land Rover LR3 to Provide 5-Flat Trailer Connector
  • You will first need to install a tail light converter like Curt # 56146KIT on your Land Rover LR3. The link provided will show you all options. Converters vary slightly in the amount of current they can deliver, so if your trailer uses many incandescent lights you might want to choose a converter with higher current capacity. All will install in essentially the same manner. With a 4-pole installed you will simply add TowReady 4 Pole to 5 Pole Trailer Wiring Adapter # 20036. This includes...
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  • Curt Trailer Wiring Harness on a 2012 Subaru Forester Has Stopped Working
  • Usually when something like this happens it is due to a blown fuse but since your fuse is good and because the wiring harness has power, this is not the issue. Instead you will want to make sure that the ground connection is still good. You may need to move the ground to a different location. Ground issues typically show up when there is more load on an electrical system. You would connect your trailer, that creates more load and that is when the bad ground would show up. It is...
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  • 4-Way Wiring Recommendation On 2007 Hummer H3 Without Tow Package
  • To install a 4-way connector at the back of your 2007 Hummer H3, I recommend the Draw-Tite Custom Fit Vehicle Wiring, part # 18252. This kit will give you the items needed to hardwire a 4-way connector to your Hummer wiring. The kit includes the wires which have the functions printed on them, along with a circuit tester, and the instructions for installing. To secure the trailer connector to the back of your H3, I recommend using a mounting bracket like part # 18144. I have attached...
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  • Are Additional Relays Needed to Install Trailer Wiring Harness 119190 on a 2014 Acura MDX
  • The note you mentioned about possibly needing a relay should not apply to wiring harness # 119190KIT on your 2014 Acura MDX. This is because the harness does not use any of the factory installed tow package wiring connections. The # 119190KIT harness gets the signals it needs from splicing into the vehicle tail light wiring and from the connection to the vehicle battery. No additional relays are needed. The instructions are linked on the product page, and on this page, on the right hand side.
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  • Troubleshooting Weak Trailer Brakes
  • I would check the main ground for the trailer. This is the wire that runs from the trailer connector to the trailer frame and provides the ground for the entire trailer. The ground strap may have come loose and now may not be strong enough to fully apply the trailer brakes. This could be a magnet wiring problem. It is unlikely that the magnets are bad on new assemblies, but if the wiring is not properly connected, it could cause problems. Check to see that the magnets are properly grounded...
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  • Wiring Kit Installation Instructions For 2003 Volkswagen Passat
  • I am sorry the installation instructions were missing from the Tow Ready Custom Fit Vehicle Wiring, part # 119178KIT you received. I am attaching the installation instructions for you. I have attached a link showing this kit being installed. The vehicle is different from yours, but it may give you an idea how this kit is installed.
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  • Will Tow Ready 4-Pole Trailer Wiring Harness # 119190KIT Fit 2011 Mercedes-Benz GLK350
  • The Tow Ready 4-Pole Trailer Wiring Harness # 119190KIT is a specified fit for your 2011 Mercedes-Benz GLK350 with multiplex wiring. This kit includes a circuit tester to simplify the process of identifying the correct wires on your GLK350 to connect to the module. All necessary connectors are included along with the required fuse and fuse holder. For reference I have linked both the written instructions and an installation video showing use of this item in another vehicle. I also included...
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  • Troubleshooting the Wiring and Pollak Adapter on New Jet Ski Trailer
  • I would start off by checking the ground for the jet ski trailer as well as the ground for the right tail light. Make sure that these have a good, solid connection to a clean metal surface on your trailer. If the right tail light still isn't functioning, I recommend using a circuit tester like # 40376 to check the functioning of the Pollak 7 Pole to 4 Pole Adapter, # PK12742. If everything is functioning as it should on the adapter, I would check the trailer connector to make sure...
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