mudmaker
Iowa
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I spoke earlier about a 2003 Dodge truck 3500 that I got recently and today I tried to install 7 pole round outlet on the back. It had a 6 pole round on it from the previous owner. Apparently someone tried to get by on the cheap and because of that they cut off the accessory plug under the bed and hard wired it to the 6 pole plug.
I guess I would like to find out what like wires went where in the factory plug that is now missing.I dont seem to have any rt turn signals for the trailer and in just backing up close to a trailer and hooking the wires we still dont have any trailer lights at all.My thought is more than one wire make up the amperage for each function. Does anyone have any idea what wires would go to the same locations? There are roughly 12 wires in the loom and obviously I only need the six that go to the trailer.
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donn0128
Pronounced Ore-gun
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Do you have the correct wiring diagram for the 6/7 pin plugs? If not you can download them. Just do a web search for the Bargman 7 pin wiring and it will pop up at you. It is the standard that has been used for almost ever for trailer wiring.
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mudmaker
Iowa
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Yes I have a wiring diagram. My biggest problem is trying to find out where all the wiring that was left hanging in there goes. everything has such small guage wire that its not clear to me how they can all can the proper amount of power.
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Old-Biscuit
Across the USA
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4,5,6 & 7 pin wiring diagrams/info
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donn0128
Pronounced Ore-gun
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Make yourself a test light. Solder a couple wires to a 12 volt light bulb. Add alligator clips and it becomes a one person job to trace the wires.
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tkcrawford
Edmonton, Alberta
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I assume you are saying that the previous owner cut off the end of the factory harness and hardwired a 6 pole plug onto the ends of the wires. If so, I have the service manual for my truck with the factory wiring diagrams. My truck is an '04 but I'd bet the wiring harnesses are the same as yours.
The factory wiring harness did not run directly to the 7 pin trailer connector. Instead, it ended at a small, square, 10 pin connector. Then there was another short harness that went from the 10 pin connector to the 7 pin trailer connector. This smaller 10 pin connector is used to break into the factory harness if you were going to install a T-connector to put another 7 pin connector in the bed, for example.
At any rate, the wiring/pinout for the 10 pin connector is as follows:
1 - unused
2 - right turn, light green, 18 gauge
3 - backup lamp, white w/light green tracer, 18 gauge
4 - + 12vdc, red w/violet tracer, 14 gauge
5 - parking lights, brown, 18 gauge
6 - unused
7 - trailer brake signal, dark green, 14 gauge
8 - ground, black, 14 gauge
9 - ground, black, 14 gauge
10 - left turn, yellow, 18 gauge
If this isn't the information you were looking for, I apologize for taking up everybody's time.
* This post was
edited 01/24/12 02:35pm by tkcrawford *
2004 Dodge Laramie 3500 Dually, CTD 305/555, Quad Cab, 4x4, NV5600
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mudmaker
Iowa
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thank you tkcrawford. That is what i need. Unfortunately the colors on my truck are different. The ten pin is gone and apparently the right turn wire is shorted out somewhere. I hooked everything up that I could and plugged into a utility trailer and all the lights on the left side were very bright and all the right side were dimmer. none of the turns worked. Even if I tried jumping off the turn in the box tail lamp it wouldn't work. Probably too much draw for the computer in the truck.
After checking all the fuses I will ask if there is a relay that could go out, (relays usually don't go bad but...) or something else I should look for.
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tkcrawford
Edmonton, Alberta
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Do you know if your truck came from the factory with the trailer tow package? If it did not, it wouldn't have had that 10 pin connector and the associated harnesses and 7 pin connector. That may explain why the wire colors are different. In that case, the previous owner must have simply spliced into the wiring for the truck turn signals and parking lights, etc. Do all the lights on the truck work correctly when it is not connected to the trailer?
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tkcrawford
Edmonton, Alberta
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I have found the pinout and wire colors for the 10 pin connector for your 2003 truck. They are quite a bit different than mine. They are:
1 - unused
2 - right turn, white w/pink tracer, 18 gauge
3 - backup, violet w/black tracer, 18 gauge
4 - 12 vdc, white w/red tracer, 14 gauge
5 - park lamps, black w/orange tracer, 18 gauge
6 - unused
7 - brake signal, light blue, 14 gauge
8 - ground, black, 14 gauge
9 - ground, black, 14 gauge
10 - left turn, yellow w/pink tracer, 18 gauge
Hope this helps.
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mudmaker
Iowa
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Yes that is the color combination that I have. I am still puzzled why there is three ground wires, two tail wires, two left and two right turns all in this harness that should go to the 10 pin connector. (none of these have anything to do with the lights on the truck box.) also, I can't get any power thru the right turn at all. Is there any other connections from the back to the front?
Honestly I never thought I would have these kinds of problems with trailer wiring. Heck, I used to install truck accessories for a living. That was long ago, a little to long I guess. I have forgotten anything there ever was to remember.
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