If all you want to do is change a bulb, you pull the license plate off to gain access to the wiring harness. After you twist the harness counter clockwise to loosen the harness, let it drop down and access it to change the bulb from underneath the car.
I believe it's located behind the passengers side dash panel.
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On a 1999 C5 corvette manually put the flip up headlight in the up position, remove the plastic headlight trim around the headlight with three screws... put your bare arm under the raised headlight and remove the turn signal bulb with a careful twist.
pull the steering wheel
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The AC power relay is located behind the right side of the dash on a 1991 Chevy Corvette. It is on top of the plenum.