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Author Topic:   Headlight wiring question
cali289
Journeyman

Posts: 8
From: Davis, CA
Registered: May 2001

posted 05-19-2001 02:49 AM     Click Here to See the Profile for cali289   Click Here to Email cali289     Edit/Delete Message   Reply w/Quote
Sigh... it looks like this will be the weekend I tackle the electrical problems.

Okay, I should have noticed this particular problem sooner, but I'd honestly never driven my '65 coupe at night before!

Pull the headlight switch out one notch, dash lights come on, but nothing else, i.e. no other lights of any kind.

Pull headlights out two notches, and everything goes on, tail lights, headlamps, and the hi-beams light on the dash.

Problem with this of course is that the hi-beams aren't really meant to be running for long periods of time (Or at least I guess, something overheats.. not sure if it's the bulb, a fuse, a wire?) and so the headlamps (and dash lights, and hi-beam light) start failing intermittantly... at first just fading, then blinking randomly, then are just mostly off.

What should I be looking at first to fix this? Just the switch? Since the tailights don't go on until the hi-beams do, is it a deeper wiring issue?

Thanks for any ideas.

--Matthew

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Doc
Gearhead

Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001

posted 05-19-2001 04:31 AM     Click Here to See the Profile for Doc   Click Here to Email Doc     Edit/Delete Message   Reply w/Quote
The switch is either bad or someone has changed the wiring so that everything is on one pole of the switch. I'd look the wiring over and see if some modifications have been made. If the wiring looks stock just throw a switch in it and maybe it'll cure it.

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richard bohm
Gearhead

Posts: 373
From: tucson,az-luray,va
Registered: May 2001

posted 05-19-2001 04:58 AM     Click Here to See the Profile for richard bohm   Click Here to Email richard bohm     Edit/Delete Message   Reply w/Quote
i would be willing to bet the wiring has been modified(and likely screwed up!). you can get a new under dash harness from most of the mustang parts sellers. a new switch is also a good idea. you may even consider using relays to power the headlights. that will take the pressure off the switch and put it on the relay where it belongs. if you do this use 30 amp relays and 30 amp fuses near the power tap.

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