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Old 12-11-2008, 11:56 PM   #1 (permalink)
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Rewiring a 7-pin connector (wire colors?)

Hello all you experienced trailering types...

In preparation for towing a 20' cargo trailer, I come to see that the 7-pin connector on my "new-to-me" 97 3500 is right out of Dr. Frankenstein's lab. Chopped up wires with two busted 4 and 3 pin connectors... (see image)


The good news is that there are 7 wires on both sides of the chaos. The not-so-good news is that the colors of the wires do not correspond with the standard wiring diagram I found on the internet.

I was wondering if anyone has a dodge-specific wiring diagram that deals with things like: a purple wire, no yellow, an orange stripe, a red, no white - all departures from the standard wiring diagram. If I know what the colors are for, I can rewire it in no time.

Any help much appreciated.
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Old 12-12-2008, 12:01 AM   #2 (permalink)
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You can get the back half of that harness from dodge if thats an OEM harness. My service truck blew an inside tire and took out that harness in the same place yours is spliced and I got the back half of the harness for like twenty bucks.
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Old 12-12-2008, 12:07 AM   #3 (permalink)
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Looking at plug on the truck from the rear of the truck. Wire trailer plug accordingly.
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Old 12-12-2008, 12:08 AM   #4 (permalink)
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Just to be clear, the issue is not with the hardware, just learning what the color codes of the wires mean - black (12V) and blue (elec brakes) are clear, the other colors are non standard and I am hoping to understand what they control. Really no need to buy anything, because I'll have to wire it up in any event.
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Old 12-12-2008, 12:12 AM   #5 (permalink)
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So the diagram that I show is not what you're looking for??
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Old 12-12-2008, 12:31 AM   #6 (permalink)
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How about a test light and see what each wire does?
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Old 12-12-2008, 12:38 AM   #7 (permalink)
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test light will get you working and use the diagram. my old truck was brown running light yellow and green turn lights red was aux wire blue brakes white ground. but i always use test lite to get right on diff model trucks
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Old 12-12-2008, 01:40 AM   #8 (permalink)
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Quote:
Originally Posted by dieseltracks View Post
So the diagram that I show is not what you're looking for??
I have that diagram. I also have a wiring harness that has colors (many colors) not shown on the diagram. Thus my original post.

I have found a chart on etrailer.com that shows he Chrysler colors and it looks closer to what I have, but has dual purpose and single purpose bulb systems totalling 7 wires - even more confusing...
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Old 12-12-2008, 01:52 AM   #9 (permalink)
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Ahhh, I see. You were looking for the wiring diagram/colors for the truck connectors instead of the trailer plug wiring.
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Old 12-12-2008, 03:03 AM   #10 (permalink)
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Quote:
Originally Posted by dieseltracks View Post
Ahhh, I see. You were looking for the wiring diagram/colors for the truck connectors instead of the trailer plug wiring.

Yes, that is my quest.

Perhaps with some stare-at-the-wires time and the above chart, I can get it to make sense.

I plan to cut out the spaghetti and splice in a piece of 7-wire trailer lead (all standard colors) so I want to know where I'm going both sides of the new piece as I will be in "rainbow-land" and I want it to work after all that splicing...
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Old 12-12-2008, 07:58 AM   #11 (permalink)
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I think this is what you're looking for.

Dark green/Red stripe is your left turn signal and brake light
Brown with pink stripe is your right turn signal and brake light
Light blue is the trailer brake output from the connector under the dash
Black is ground (can always run your own if needed)
Brown with Orange stripe is your marker/running lights
Red with a tan stripe is your +12V power
Violet with a black stripe is your reverse lights.

Make sure your 40 Amp fuse in Fuse#7 in the fuse block under the hood is good, or else you won't have 12V back at the back, nor running lights back there.

Also, make sure you have a relay in the "Trailer tow relay" or else you won't have running lights either.

Hope that helps :thumbsup
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Old 12-12-2008, 08:01 AM   #12 (permalink)
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dieseltracks thanks for the info!
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