1993 corvette will not start

Since the ignition switch has to kill the power to the wipers. Replace the wiper switch. Carbon build up inside the switch is why it won't turn off. You could take the wiper switch apart and clean up the tabs with sandpaper. Beware of springs though..

did you verify fuel delivery?

check your fuel pressure should be 35 to 42 with key on engine off,and about 5 to 7 more with engine running and vacuum line off the regulator,also check your fuel regulator with vacuum off it should be dry if it is wet with gas it is bad

fuel filter-replace or stuff in gas tank clogging up

Assuming you have replaced the fuel filter, you would check the pressure at the fuel rail with a gauge.

Car doesn't turn over,but ignition turns on? Doesn't happen all the time,it just happens.. If I let it sit for a while it all of sudden turns over and starts. Happened twice this year..

fuel regulateur at the end of the fuel rail may be your probleme to isolate block the returne line if run good .replace the regulateur

Are you fully charged though? If you don't have a full charge the clutch will not kick in.

The cooling fan relays are located on the upper radiator support in front of the left front wheelhouse.

you have 2 relays for your fan, primary and secondary
their controled by the PCM according to the temperature

replace blower control module