I have 91 corvette backup lights do not work ,bulb & fuse are ok also 3rd brake light does not work,corvette is targa top with 14000 miles.
The backup light switch connected to the transmission is probably the problem.
I had the same problem with a 91 mazda 626. turned out that the wires that ran from the lights along the trunk and back into the harness were broken from opening/closing the trunk. i would check around that area first.
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