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how do I wire my trialer harness on my 4500?

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I just bought a 4500 2 days ago, I am setting it up and it dawnwd on me, there's no trailer plug! The brake conroller plug is there under the dash, but what do I need to hook the rest of this up? I need the big round 7=wire plug setup.
 
I just bought a 4500 2 days ago, I am setting it up and it dawnwd on me, there's no trailer plug! The brake conroller plug is there under the dash, but what do I need to hook the rest of this up? I need the big round 7=wire plug setup.



On the back of the truck is the bundle of wires for the 7-pin trailer plug.

You will need one of the 7-pin connectors and a mounting bracket for it.



This link:

http://www.dodge.com/bodybuilder/2008/docs/wd/dr/dcrrcircdef.pdf



gives you the wire color and its function coming from the truck.



This link:

Trailer Wiring Diagram For 4 Way, 5 Way, 6 Way and 7 Way circuits



(scroll to about 1/2 way on the link) gives you the tow vehicle side of the 7-pin connector and what each pin represents. (be mindfull of the notch in the plug and note its location).



Good luck.
 
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