No 12-Volt Power for Trailer Connector Battery Power on 2004 Chevrolet Silverado

Updated 07/16/2025 | Published 11/17/2016

Question:

I am missing the 12 volts on charge line to trailor connector

asked by: Tom

Expert Reply:

If you are not getting 12-volt power for the battery charge line coming out of your vehicle's 7-Way wiring connector, you might need to check the fuse and wiring located under the hood. If the fuse is installed, it would be located in slot 68 of your fuse box. A 40 Amp fuse is required for the battery power. I recommend using # PTW2993 to check the wire connections for power.

Check first if a fuse is installed. The fuse that Chevrolet states should be used in this slot is a 40 Amp fuse. You will need to check if the fuse is blown or not. If the fuse is okay, you will need to move to the wiring.

The Chevrolet Owner's Manual states that the wires at this fuse slot may not be connected and will have to be connected to the fuse block before this circuit will work. If the fuse is okay and the wires are correctly connected, then you may have a problem with the wire leading to the connector or the wire connection at the 7-way connection.

If the fuse and wiring for the fuse checks out fine, let me know and we will walk you through further troubleshooting.

I have attached two articles on trailer wiring questions and wiring on 1999-2006 Chevy/GMC Trucks.

expert reply by: Jared P

Ross G.

7/16/2025

My 2004 does not have slot 68 for a fuse 40 amp. It’s a diesel so I don’t know if that makes any difference.

Jameson C.

7/16/2025

@RossG It sounds like you are trying to activate the charge circuit of your 7-way on your 2004 Silverado. If you check out the attached help article you can see exactly what is required to do this. It is more than just inserting a fuse.

Helpful Links

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