How to replace a light switch in a 98 corvette

You have major wiring problems or bad switches. I would replace the headlight switch before testing for any thing else. if it's the switch you got lucky, if not, it will be a lot of wire testing.

Are you looking for a wiring diagram or a head light switch with a vacuum diaphragm to operate the light covers or to bring up your lights when you turn them on,like a corvette,if like a corvette,I had a 1971 corvette that didn't open and I used the vacuum parts on the light switch off of a 1968 Pontiac GTO,the light switch was the same as the corvette

If you can verify current going out of the main dash switch towards the headlamps, then I would go relay hunting. My guess is the switch, since the brights and fog lamps work on demand (dimmer switch pulled).

It is a blown fuse,or the dimmer on the headlight switch,the headlight switch would have to be replaced,if nothing else is lighting up.if so.the bulbs are blown,or the connector to the cluster is not making contact.

Those are vacuum actuated headlights and the vacuum leaks down when the engine is off. Probably have a leak in the headlight actuators, will need to replace or rebuild one or both of them, not a big problem for them to pop up some people just do not like for them to pop up while parked.

Raise the headlights, either with the switch or manually by turning the knob on the headlight motor counter-clockwise.
Unplug the lights NOW to avoid an accidental closing on your fingers,
Remove the 3 philips screws holding the black plastic surrounding the headlights, and slide it forward, there is a small clip on the top that helps hold it to a corresponding clip at the top of the headlight,
Look inside the cavity and you can see the 5 nuts/bolts ( 6 on later years ) that need to be removed,
If you are on the driver's side you can now remove the whole assembly, on the passenger's side you must first unplug the headlight door control module.

why not just disable the motors while in up position?

Maybe this infromation can help you:
- 1997 - 2003: Headlamp Actuator Replacement Procedure

Good luck (remember rated this help).

I would check your headlight relay switch that is located in your steering colum

Maybe a relay but maybe and more probably a broken wire Get a diagram Chilton or Haynes manual