Headlight Switch
WARNING: This page is about a different car, the 1994 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
With headlights off, battery voltage should be present at headlight switch terminals "G" (Gray/Black wire) and "J" (White wire). With headlights on, battery voltage should also be present at switch terminals "H" (Black/White wire) and "F" (Brown wire).