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7-Way Wiring Harness Installation on a 2004 1500 Chevrolet Silverado


I need to know If this will fit my truck. I dont see the round plug in my wiring harness. does that mean I need to get more hardware?


Expert Reply:

You can use the Pollak 7- and 4-Pole Trailer Connector Socket, item # HM40975, if you are replacing an existing 7-way connector on the rear of your 2004 Chevy Pickup.

If you need to install the 7-Way connector for the first time the factory connection point is going to be on the left side of the vehicle above the spare tire. If there is a plug on the end of the wiring harness located above the spare tire, it will simply plug into the rear of the HM40975. If the harness ends in bare wires, you will need # PK11998. The pigtail would plug into the rear of the HM40975 and wire up to the existing harness.

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Follow up Questions

Matthew V.
I have a 2004 Silverado 1500 Z71 with factory install tow package that has a 7 PIN trailer connector already installed. Will the HM40975 bracket be a bolt to bolt swap or will have drill new holes in my bumper for it?
Etrailer Expert
Reply from Chris R.

The Hopkins # HM40975 should be a direct replacement but just to be sure you can compare the existing bolt spacing on your bracket to that of this unit. On the Hopkins bracket the two bolts are spaced apart by 2-3/8" (center to center).

Reply from Matthew V.

@ChrisR Thank you for the response @ChrisR but I found out that my stock tow package bracket is welded to the round tube of the tow bracket.

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