I've got an 84 D-150 short bed. The wiring is really clean. About a year ago I removed the dash cluster to replace the dash lights. (The cigar lighter doesn't work and neither does the radio.) Since then my marker lights/dash fuse keeps popping. Head lights, brake lights, turn lamps all work. But the fuse blades touch the contacts in the fuse block and blow a 20 amp fuse nearly instantly a 30 amp fuse pops after being driven for a while. I've got a new ground strap on the bed as one was broken. I've replaced the headlight switch within the last 3 years. The bed lights are clean and tight as they are new. I believe that the alternator is the original part and I'm wondering if the internal voltage regulator is gone. Any thoughts would be really helpful. Thanks.