Electrical issues

[Hummerboy]

I have a weird problem.... My turn signals/flashers wont work. When I go to replace the fuse the fuse gets blown immediately. Also not sure if these are connected but my dome lights and mirror light on inside of car do not work either. I took the HUMMER to AAA and they worked on it for 6 hours and they could not find the problem. Any help would be greatly appreciated!

 

[alrock]

Dome lights - can you turn them on manually inside, or do they just not work when you open the door?

Turn signals - well, there's likely a frayed wire somewhere. You might actually want to start with the trailer wiring harness at the rear bumper, below the door and above the bumper. It's known to get frayed or corroded due to it's exposure.

 

[Hummerboy]

No the dome lights will not come on manually or when I unlock the doors. Will I still have trailer wiring even though I don't have tow package?


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[alrock]

Yes, there's wiring on all H3s though I believe the actual set may vary between towing equipped and non-equipped. Either way you've got a bit of a potential nightmare tracking this down. I would also try checking the sockets on the taillights as I believe they've been known to fail, and could cause the blown fuses.

 

[4speedfunk]

Check the wiring harness near the left rear of the vehicle....behind the bumper close to the license plate. The wires commonly chafe against the body seam. Adding the tow package is a simple add-on harness...the plug is already there on the main harness.
Blowing a fuse means a short and that's comparatively easy to find. It's the ones that don't blow a fuse that are hard to track down.