My 85 Corvette dash lights sometimes fade out completely. The next day they work fine. Is there a component I need to change? Thanks, Dave

Probably complete failure of the I/P dimmer

There is usually a dimmer switch for the dash lights near the left side of the dash behind the steering wheel. Sometimes that can get bumped when you get in the car and turn the dash lights completely off.

Is it a digital tuning? If it is does it auto search but just not find any stations? If this is the case then as J.D.Browning suggested it is an aerial problem! You said there are 2 aerials.....how are they connected to the radio?

It will be really hard to find the problem is a bad ground ...batterie ground to the body...under dash ground

I don't know about the system, but it would seem like it is working in reverse have you checked to see if some how the wires are switched around.

if u drive for short distance chek your charging system if ok replace cluster

CHECK BATTERY IS CHARRGED OR NOT

Check and replace any blown fuses.

replace your headlight switch

well your in luck i just removed mine today lol. there are 5 1/4 inch screws on the bottom side of the dash on the passenger side of the car remove them pull the plastic cover down and disconnect the light mounted on the piecce you just removed next make sure your battery is disconnected cause it may fry it if power is connected. Next you will need a 10mm look straight up you will see the box it is aluminum with 2 wire harness attached. There is a metal clip holding it attached pull it back and un hook the harness then it will slide right out.