Under the hood on the drivers side, pull the lid off the fuse/electrical box. I sold the '04 over a year ago but from memory I think there should be a 40 amp fuse in the inboard forward position. I believe this is for trailer charging current. It may be marked Stud #1. This fuse is not installed from the factory.
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Leo and Janice
2007 MS 36 TK3 Glide Ride pin box
2012 GMC 3500HD D/A CC 4X4 DRW AirSafe Hitch
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