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Electrical 3rd Gen Dodge Ram Electrical Problems and Questions.

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Old 05-16-2012, 09:33 PM
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Default Trailer wiring harness


The 7-pin trailer socket on my 04 Ram 3500 wasn't behaving properly, so I bought a new Reese 7-pin socket to replace it. I cut the wires at the back of the factory original to install the new one.

After I cut the wires, I realized two problems: 1) there are 8 wires in the factory harness, 2) the colours don't seem to match any standard I can find.

Can someone tell me what each wire is? I'm assuming the green and yellow are the turn signals, but I can't figure out what the rest are.

There are:
2 black wires
1 yellow
1 grey or brown (hard to tell, it's dirty!)
1 green
1 white/green
1 red/purple
1 dark green

I hope someone can help me with this.


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Old 05-17-2012, 09:57 PM
Crispy's Avatar
Crispy Crispy is offline
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Join Date: Apr 2012
Location: Queens NY and Sullivan County NY
Age: 31
Posts: 89
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Vehicle: 2003 Dodge Ram
Trim Level: SLT Laramie Quad Cab
Color: Black
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
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Trailer tow connector-add on - 10 way

1 - -
2 white/pink trailer tow right turn relay output
3 violet/black backup lamp feed
4 white/red fused b(+)
5 black/orange park lamp relay output
6 - -
7 light blue trailer tow brake b(+)
8 black ground
9 black ground
10 yellow/pink trailer tow left turn relay output

This is from my 03 service manual. Obviously different from your 05 but you can test the wires at the plug and take it from there. Keep in mind theres also a trailer tow turn signal relay up from in the integrated power module. You can download your service manual here:

Good luck.
03 Ram Hemi | 99 Trans Am LS1 | 99 Cherokee 4.0
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