Headlight Switch
WARNING: This page is about a different car, the 1995 Buick Skylark. However, it is still accessible from the selected car via links, so may be relevant.
With turn signal/headlight switch connectors still attached, battery voltage should be present at connector terminals "A" and "F" (Orange wires). With headlights on, battery voltage should be present at connector terminal "C" (Tan wire). Activate headlight high beams. Battery voltage should be present at connector terminal "B" (Light Green wire).