Completing the 12 Volt Power Circuit for Trailer Wiring on a 2006 GMC Sierra 2500HD
Updated 07/08/2025 | Published 01/24/2014
Question:
2006 GMC 2500HD 6.0L Is the fuse that is talked about in the power distrubution box for chargeing trailer batterys have a red plug in it. Every thing works at the 7 way plug except the charge pin. I didnt what to mess something up by putting a fuse in it. Thanks
asked by: Mel P
Helpful Expert Reply:
Yes, GM sometimes uses a red plug or dummy fuse in place of an actual fuse for the trailer battery charge circuit. I have attached a video on a 2004 Chevrolet Silverado that shows the red dummy fuse. You can move to the 2 minute and 20 second mark to see our installer replace the dummy fuse. You will want to replace the plug with a 40-amp fuse.
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Rich M.
7/8/2025
I read through this Q&A. However, I have a 2006 Silverado 2500HD Duramax - having the HD trailering options (except HD brakes). My manual states the following Fuse: Stud #1 Usage: Auxiliary Power(Single Battery and Diesels Only) / Dual Battery (TP2) Do not install fuse. I temporarily installed a 30 Amp in the PDC at the Stud #1 location, for trouble shooting purposes. Doing this completed the Aux power circuit at the rear trailering wire harness as well as at the blunt-cut wire harness installed on the frame (between the box and cab). I removed the fuse afterwards. So, do I permanently install a fuse at this location or not - since the manual says not to.