1970 mach 1 headlight issue
This issue is driving me absolutely nuts. The headlights and sportlamps on my 1970 Mach 1 quit working. Every other light (brake lights, tail lights, parking lights, interior lights, etc.) still works. I've replaced the dimmer switch and the headlight switch to no avail. I can't think of anything other than a wiring problem. Any idea how to test the wiring, and where to start looking? Thanks for the help.