I have a 1983 GMC Sierra it has no dash,tail lights an brake lights are very dim
Check for a bad ground
a fuse
if your installed a new radio double check your wiring most likely the ground of the radio isn't wired right Or: The dashboard is wired to the tail light circuit and both are controlled by the same fuse. The 10amp fuse is in under the hood fusebox passenger-side next to the battery and is labeled TAIL, but includes the dashboard running lights.
Brake lights and turn signals are on a separate circuit from the tail lights. Tail lights are on the same circuit with the dashboard lights. If the dashboard lights aren't working either, check the fuse. If they ARE working, check the headlight switch.
have you check the tail light fuse to see if it is blown. other possiblly is the headlight switch.
94 mercury grand marque dashboard, hazard, and tail lights do not work?
Probably a fuse
did you check the fuse?
From my Experience most of the time its a fuse that is blown. The dashboard and tail lights run off the same fuse
Man vehicles have the dash lights and tail lights wired through the same fuse. Check your fuse box for the dash or tail light fuse. Something has most likely caused it to blow.
Dead battery or dirty/corroded terminals
check fuses