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Old 12-07-2004, 07:19 AM
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Headlight switch?

The headlights in my 1972 Ford truck have developed a problem lately. After they have been in use for an extended period they will begin to flash on and off. I first noticed this one dark and stormy night as I was hauling a S10 pickup about 14 miles north of Jefferson Iowa. Since it was raining that day I had my lights on all day and when it got dark I noticed my lights were flashing. They would go off for a couple of seconds and back on. I made it into Jefferson and spent the night in a motel room since I assumed that would be safer than try to drive the 50 miles home with intermittent lights.

I have driven it several times at night since but only short distances until Friday night when I got delayed. Once again I was north of Jefferson hauling another pickup, only this time it was an F250 Ford, when it got dark on me. I turned on my lights and drove all the way home without a problem. As I pulled in my driveway the lights began to flash.

Just the headlights flash on and off, all other lights stay on. On my truck the other lights are protected by a separate circuit breaker located under the dash on the passenger side of the cab. I am assuming that the circuit breaker protecting the headlight circuit is getting weak and that is the source of the flashing lights. Does this sound reasonable to you?

I think replacing the switch should cure this problem but I cannot get the knob off. I have never replaced a headlight switch and I just cannot find the magic formula for knob removal. Chilton's is no help and I have searched the knowledge base to no avail.

So how do you get the knob out?

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Old 12-07-2004, 12:23 PM
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headlight switch

you gave to look up into the light switch mounted under the dash. You will see a little silver button which you have to push in, in order to remove the knob. The knob is mounted on a shaft that goes all the way through the switch, and when you pull on the nob, with the button depressed, the shaft will come out with it.

This button is what prevents the knob and shaft from coming out of the switch when you pull it out to turn on your head lights.
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Old 12-07-2004, 07:11 PM
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i would bet money your problem is in your dimmer switch. that is what happens when they go bad. hope this helps. good luck.
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Old 12-07-2004, 08:13 PM
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Ford doesnt use Relays for there lights so quite a few amps go threw the dimmer and light switch. Melted connectors are common causing loss of connection as they heat up....another possibility Put a volt meter on your battery while this is happening your regulator for the alt may be dropping out and on.Be shure to check the grounds to the headlights it should be somwhere near the rad support. Black wire most likley
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Old 12-08-2004, 12:14 PM
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dimmer switch

Its ironic that the dimmer switch being faulty didnt jump out at me as I had that same problem with two different Fords within a month, several years ago.
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Old 12-11-2004, 03:40 AM
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the same problem is happend to me on my 65 mustang.....
so it goes like this....

the problem tends to fix it self this happened to me like 2 years ago, for a week, but then the problem fixes itself....then again another year the same problem headlights flashing......then week later it fixed it self....
and now.. like in dec..of this year (2004) i bought that after market headlamps. . and like a week later i drove it and i noticed it started flashing again they flased then for a while they would stay on.....so i hurryed home.... but i said to myself this has happend before in the years that past,snice the mustang is my project car and i live in a apratment i dident bother working on it and its been like 2 weeks that i havent driven it......and i myself assume if i change the headlamp switch....it will fix it self... anybody else has an input on this mystery? i will go ahead and replace the headlamp switch and give you guys an update..

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