theres a short somewhere most likely bad ground
I believe the relays for the headlights are under the hood on the driver's side fender under a black cover with all the "big" fuses. hope this helps you out
start by checking your fuses.
check the fuses.
You didn't mention if you checked/tested the low beam headlamps or not.
have you checked your fuses?
Check bulbs, fuses, and check for wiring problems
Check the bulbs and check the fuses.
it could be your fuel pump relay. it should be located under the hood in a box marked fuses or relays.
It is possible that both of the fuses are bad for the low beam headlights and the cruise control. A loose ground wire could cause the fuses to blow.
relay in the hood fuse box HDM relay (Headlamp Driver Module)
run a wire from the battery to the radio with an inline fuse... or check ur fuses and see if its blown
If the headlights are not working correctly on a 1990 Corvette, the fuses or lights could be going out. Replace the old fuses and check that all wires connected to the lights are functioning correctly.