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Author Topic: Damaged trailer wiring harness  (Read 1662 times)


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Damaged trailer wiring harness
« on: March 16, 2014, 01:52:47 AM »
While backing up my 2004 Wilderness TT, I had to nearly jack knife the rig to get it into the trailer storage spot. Unfortunately, the big wiring harness that plugs into my suburban got caught in the trailer hitch and was nearly pinched in half, blowing a couple of fuses in the truck but I think the trailer circuits weren't shorted out. We'll see once I repair it. Rather than attempting to patch it up, I thought I should just replace this harness. It's about 4-5' long and goes into a rectangular box bolted up under the frame of the trailer. Doesn't look like a big job but any suggestions where I can buy a new cable? I've also heard that not all of these 7 wire cables are color coded to a standard, and might not match up the original colors. Anyone have knowledge of this?

Rene T

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Re: Damaged trailer wiring harness
« Reply #1 on: March 16, 2014, 06:56:50 AM »
I always thought that they were standardized but maybe not. You can buy them at any RV store. You can check the new one against the old one by taking continuity checks with a meter. Make yourself a picture of the end of the old plug and figure out what color wire goes to each hole on the end of the plug. Then compare it to the new one. Shouldn't be difficult to do.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL


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Re: Damaged trailer wiring harness
« Reply #2 on: March 16, 2014, 07:42:23 AM »
Also look here if you need instructions

Jerry & Patsy Potter, Taz & Jake Jr.
2000 Winnebago Journey
2006 Ford Explorer 4X4
Home: Milledgeville Ga.

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Re: Damaged trailer wiring harness
« Reply #3 on: March 16, 2014, 07:54:06 AM »
Dig in, you're thinking too much. Peel back all the tape and see whats what. Maybe you don't need anything but a roll of the GOOD electrical tape, not the cheap stuff that cost half what the Scotch/3M does.
The pinched spot needs to be repaired or cut out anyway. I doubt you can find enough slack in the remaining harness to make up the difference, if much has to be cut out. You pull slack out of the trailer harness, you tighten wire runs, they may chafe more on surfaces and edges they didn't lay against before, and you may be just a wee short and have more binding when turning. If you splice new wires in make it long enough to hang down with the safety chains. Cross it around the chain closest to the T/V outlet so the pigtail has to get by the chain to get near the tongue. Unhook the pigtail when jacking it into tight spots. 

Bill & Nan
93 bounder 34, chevy chassis
couple of aircooled vw's, 1 fast(sold), 1 reliable(sold).  Dubless : (
USN '76-'80, 1 boat, USS Blandy, DD 943.
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