Difficulty of Replacing Damaged Trailer Wiring

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Question:

I need to replace my trailer plug harness will it be hard to do drug harness on road

asked by: Jim B

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Expert Reply:

Replacing vehicle- or trailer-side wiring is not difficult as long as you get the correct replacement part. It is often easiest to do this kind of job when you have a circuit tester like # PTW2993 to help you confirm what each vehicle wire does, and to have a 12V battery to test what each trailer wire does. Matching up the functions is important since trailer and vehicle wire colors are not standardized.

If you'll need to splice wires you might want to consider a junction box like # 38656 which makes it easier to make those connections and that also provides those connections with some protection from the elements.

The product you referenced, Mighty Cord 4 Pole to 6 Pole Adapter # A10-6034VP will plug in to an existing 4-pole and require only three other connections: the white ground wire connects to the vehicle frame; the blue brake circuit wire connects to the output from a brake controller; and the black wire connects through a fuse or circuit breaker to the battery for trailer power. Please refer to the linked photo.

expert reply by: Adam R

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Answer 1

First of all did this problem just start happening? If the trailer has always worked fine before on the same truck then it's likely a short on the trailer's brake wiring. I would start by cleaning the connector and make sure it's free of…

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Answer 2

The Hopkins 7-Way RV Style Connector with Molded Cable part #H20046 is an excellent option for a trailer side molded 7-way cable and is flexible. In regards to use in the winter, this won't be a problem though the cord would be stiffer. In order…

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Answer 3

For a 3500 lb Electric Jack, I recommend the Bulldog Powered-Drive Trailer Jack - Drop Leg - A-Frame - 14" Lift - 3,500 lbs - Black #BD500187. This jack uses a 12 volt system, so it is compatible with your 7-way although a battery is always a…

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Answer 4

You can route the grounds from your brakes to your junction box like part #38656 but most people just ground the brakes to the trailer frame. The frame is a ground which is why this can be done, just make sure that it is a secure connection to a…

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Answer 5

Yes, the battery maintainer you have requires a 12 volt power source coming straight from the battery and the center pin of your 6-way is exactly that so it would work very well for you.

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Answer 6

If you take a look at the photos I've attached you can see how the wires from a 7-way connector can be run to junction box #38656. You would also need ring terminals #44-5310A. I've added a link to a video review, as well as an install of…

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Answer 7

If you are experiencing power at the 1 o'clock position on your 7-way, the issue most likely lies with the trailer's wiring. With this situation, it is important that the trailer wiring is correctly inserted into trailer's side 7-way plug…

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Answer 8

If you are wanting to add brakes to your trailer, the correct way to to it would be to remove the 4-pole connector and install a 7-way harness/plug like part #H20046. You would use a junction box like part #38656, and some 10 gauge wire like part…

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Answer 9

The wiring for the Tekonsha breakaway kit #50-85-313 and trailer wiring junction box #38656 is listed below. You can also view the picture to the right. The breakaway kit will have 3 wires to hook up where as the breakaway switch will have 2 wires.…

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Answer 10

Those are the wires for the brake magnets. You will need to connect the black wire to the brake controller output wire on your trailer connector and you are correct the white wire will need to be grounded to a clean metal surface on the trailer. I…

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Answer 11

On a trailer 7-way the pin in the 1:00 position is the 12 volt accessory circuit. You'll need to make sure that pin is active on the truck side of the wiring. But there's no way to carry that charge circuit on just a 4-way so you'll have…

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Answer 12

If the 7-way you are referring to is the trailer side connector you will only need the blue wire in the 7-way if your trailer has electric trailer brakes. I do know that there are several trailers on the road with 7-way connectors for the charge line…

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Difficulty of Replacing Damaged Trailer Wiring

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