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Old 01-15-2008, 04:32 PM
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1966 mustang electrical

thank you for all the ideas. does the hot wire for the lights go into the fuse box or does it go to a fusable link??? I didn,t find a fuse for lights but they are hard to read only 5 fuses acc. htr. dome lite,lighter and i think the 5 one is a instrument panel . tried new fuses also made sure the power is coming in and out also sanded all plugins on firewall all wiring under hood a little ruff i will replace this thank you!!! didn,t know what color wire i was looking for thanks again also will look at the light switch does the power run to this switch direct also have been checking grounds .

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Old 01-15-2008, 05:52 PM
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Generally the head lights in older cars did not have a fuse, they ran through a fuse link, running lights and blinkers usually had a fuse. I would start at teh switch and see if you can find power there. If there is power my guess would be the switch is no good since everything you mentioned that doesnt work is feed by that switch. If there is no power at the switch then you need to start tracineg back to find out why. Again a wiring diagram would be very helpful and be a real common car there has to be one on the internet or maybe even right here on thi site. The electrical systems in the old cars are not very complex so it should be fairly easy to find with a meter or a test light.
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Old 01-16-2008, 05:12 AM
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Like was just said about the older cars not having a fuse for "headlights"...

Most older cars have a built-in fusable link that is an internal part in the headlight switch. That was designed to pop if the car was in a front end crash (and that type of crash would short-out the main light wiring).

I'd check to see if the HL switch has power going in, but nothing coming out in the wire that should feed the dimmer switch.

See if you can find an online wire diagram for that car. Those older cars are pretty easy to diagnose.
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Old 01-16-2008, 07:02 AM
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Download complete wiring diagrams here (and free too! )

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Old 01-16-2008, 08:54 AM
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get's confusing if you have multiple threads on one question.....

yesterday I answered your no lights question on this (your other) thread


no lights or blinking headlights is a very common early stang problem due to a overworked and failed breaker inside the headlamps switch...usually caused by the main power lead (black yellow) down thru the radiator support is shot...it was a stupid original design flaw.....having the main power feed wire exposed to rubbing and dirt and moisture in the lower rad crossmember

the lamps curcuit is this simple:
black/yellow main power from the alt/batt into the car
black/yellow splits to a black/orange which goes directly to the headlight switch safety breaker inside the headlight switch

no lamps at all= thermal safety breaker in the switch will not close= the breaker is worn out and/or the main power wire into the car is worn out/shorted/bleeding voltage causing a overload (voltage drops and amps increase=heat=breaker won't close)

ps: the trick to removing the headlights switch handle-shaft is there is a spring loaded "release" button on the body bottem of the switch....turn the shaft full left(?) or right(?)(can't recall which), then press the button and pull the shaft out....to put the shaft into the new switch just push it in,

repeating from the other thread:
pull and inspect the black/yellow main power wire and clean the connect at the firewall....it supplies power to everything in the car (ignition/fuses/brake lights/etc).....if it is "compromised" nothing will work as it should.......the lamps breaker failure is a good indicator that it is shot
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