7-Way Trailer Wiring Functions and Adding a 7-Way to a 2007 Chevy Silverado 2500 Classic

Updated 10/11/2013 | Published 10/09/2013

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4' Pigtail Wiring Harness for Pollak Replacement 7-Pole RV Socket

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Question:

2007 chevy classic silverado deisel 2500hd 4wd ext I need to know how the truck wiring is done for the trailer hookup in the back

asked by: Carter

Expert Reply:

I have included pictures of diagrams for both a trailer side and vehicle side 7-Way for you. A 2007 Chevy Silverado 2500 Classic would either have a 7-Way trailer connector or no trailer connector at the back. If it does not have a 7-Way the wiring should already be under the truck, normally located above the spare tire. To add the connector, you would use # HM40975 to add the connector.

If your wiring harness under the truck is a bundle of wires use # HM40975 and # PK11998. For the bundle of wires models you will have to test the wiring on the truck side with a circuit tester, # PTW2993, to determine the functions and then attach the wires by function, not color, to the back of the 7-Way using the diagram I have included. I have also linked some typical installation videos that should help.

To add a brake controller, you would use plug and play wiring harness # 3015-P. For a brake controller I recommend the P2 # 90885 that you have referenced because of its ease of use and reliability.

There may be some connections you will need to make under the hood to make everything fully functional. I have included a link to an FAQ article that should help.

expert reply by: Michael H