Dash lights

a couple days ago i had to jump start my 89 sho and then later i came home in the dark and noticed my dash lights werent working. i checked the fuse which is ok. what else could i be missing? also the lights for like the heater control, light control, and theres no power to the aftermarket radio. so i dont know if there is a relay that i may have burned out or what. but any help is appreciated.....tough to see the speedo in the dark..lol

Unfortunately I don't have a manual for the 1989 model year to reference. In lieu of having the diagrams, have you checked to see if power is getting to the headlight switch and if so, is it leaving the headlight switch? Do the parking lights and headlights still work?

-Rod

headlights work with the switch and as automatic but no tail lamps

Unfortunately you're probably going to need to find a wiring diagram for the interior lighting to make much progress from this point.

-Rod

When I had an 89' SHO it had the same problem happen. It was the switch in the dash, but I don't remember exactly how I tested for it. I think I pulled the switch and used a meter to verify what was coming out from each connection.