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Check how many volts/amps in your interior lights, and check also how many volts/amps on your fuses it suposed the fuses has a twice higher amps than the lights. Or it might you have electrical shorted on your electrical, check on the diagram ang follow the lines for the open wirings connections
1st common area is trailer wiring,2nd is shorted bulb,3rd is corroded/damaged wiring.Replace fuse with circuit breaker which fits in fuse position and first check for a bulb that's out and shorted,shake and move any trailer wiring,if that didn't find a problem,temporarily install a signal light flasher into the tail light fuse connections and slide a compass along wiring and compass will flick/change reading as the flasher flashes until you hit the shorted area.(an old trick to fine a short)
There is an electrical fault that causes the fuse to blow. Maybe a wire has chafed against the metal body and vibrations causes it to short out the fuse. This requires checking the wiring from the instrument cluster to the fuse box for worn insulation etc.
No interior dash lights and no tail lights on a GM usually means it's time for a new headlight switch. To check the fuse, it's in the middle of the fuse box marked instrument cluster. If the fuse is good, buy the switch. Lights blowing fuses means you either have a bare wire running down the driver's side of the truck or up into the tail light assemblies. There is also a plug in under the box on the driver's side near the bumper that may be getting wet. Hope this helps.
Not sure but I advised you before!!
Any way last time!
You have to t/s the moment the fuse blows and elimate the systems (short) connected to that fuse, for sample, dis connect the interior light, install fuse, if it blows than it is NOT the interior light, keep going till you find the short!
The problem is probably a blown fuse. Check the owner's manual for location of the fuse panel, find the fuse marked instrument panel (or similar), and put in a new fuse. If the new fuse blows, there is a short which will have to be located and repaired.
Pinched, worn, or otherwise damaged wire somewhere. You will need to investigate further to find the problem.
Get a continuity tester and check for continuity to ground with each wire.
I would suspect a door wire before the dome light wire.