on a 94 with a 3800 engine there are some underneath dash and in engine compartment near intakes for fresh air into cabin by the windshield, you have to remove a plastic cover to access
its shy?
Did you check the bulbs?
A short to ground causes all fuses to blow. If you have a trailer connecter then start there first.
checked fuses, or checked for voltage to interior light socket?
Sounds like resistor in key is bad
All '60s era vehicles used leaded gasoline. Unleaded requirements are a product of the '70s era Pollution Controls.
did you check the fuses first? Do you have power to the master switch?
check all fuses. there are 2 fuses that can prevent engine from firing if they are blown
check all the fuses.
Check all your fuses inside the car. The horn fuse is usually labeled.
If you haven't already check all your fuses and the flasher relay.
I would check the fuses. if all fuses look okay then check the wiring. if the wiring looks fine i would recommend taking it to a shop.