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Correct Trailer Wiring Harness for 2007 GMC Sierra Classic  

Question:

Good morning I would like to know if there isa adapter to go from a car 4 way plug to trailer 7 way blade plug.

1

Helpful Expert Reply:

You will want the OEM Style 7-Way and 4-Way Trailer Connector, # HM40975, which will allow the use of 7-Way and 4-Way wiring with no additional adapters. You will need to make a few more connections under the hood of your 2007 GMC Sierra Classic to complete the install.

See the FAQ page I attached for how this is done.

expert reply by:
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Chris O

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