1966 Ford Mustang Headlight Wiring Harness Problems

1966 FORD MUSTANG
100,000 MILES • V8 • 2WD • AUTOMATIC
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UTMUSTANG
After having to jump start my 1966 mustang, I noticed that my headlights and blinkers didn't work. When I inspected the wiring I found that a wire going to the left front blinker had completely melted through the its insulation. The melting started at the fire wall where the harness connects to the under-dash wiring. The rubber connector was slightly melted where the affected wire connected. In addition, a ground wire coming from the left headlight was melting. I replaced a blown fuse and replaced the entire headlight wiring harness, but when I started the car back up and tried to turn on the lights the same wire melted again. I am not sure what is causing this so whatever advise can be given I would appreciate. Thanks.
Jun 27, 2010 at 11:27 AM
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RACEFAN966
  • ASE Certified Mechanic
  • 5,029 POSTS
  • ASE Certified Mechanic
Did you replace the head light switch or check it for melting? The head light switch or dimmer switch probably is what is causing this to happen.
Jun 29, 2010 at 11:35 AM
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