Why did my headlights kill my car?

Hi Guys/Gals: Here's a strange electrical failure that I've never seen before. About a year ago, I began having some issues with the hi beam/low beam selection on the headlights on my very stock 1974 Duster. All wiring is factory original, but the foot operated dimmer switch was replaced two years ago with a new Echlin part (DS-112 from NAPA). I began to notice a fault that would come and go. When driving at night in high beam, the headlights would go out. When I shifted to low beam, the...

Why did my headlights kill my car?
Author: Cruiser