Head lights flashing

[JEF199]

I replaced light switch and hi/low switch but the head lights(only) flash after being on for a while. It will even do it w/ the engine off and truck stopped. I tried moving wires and checked grounds the only thing I noticed is that the switch gets warm but the wire conections look good. And they work fine for the first hour or so. Anyone have any ideas? Thanks

[DGrant09]

This sounds similar to an issue I had with a 7 pin trailer harness except that all my lights would flash on and off. I learned there are breakers in the system which are somewhat light duty and easily overloaded. Thunderfoot provided me some good trouble shooting points and a solution. Just as a shot in the dark, but is the wiring for this circuit in good shape and nothing tapped off of it? Sounds like there could be a good current draw somewhere.

[fordman]

yea it sounds like something is heating up the breaker in the headlight switch and making them blink. possibly a crossed wire or a bulb gone wrong some how. and somehow i seem to remember something about the regulator. could also cause this. i cant remember what i read about it but i do remember it being discussed as a possible problem.

[fmartin_gila1]

Replace the Headlight switch and install a Relay system to forever eliminate the blinky problem.

Fred

[71 LONG BED]

I've got the same problem. The power for the lights travels through the switch, heating it up. If you change to a relay system, then the switch only turns the relays on and off and will eliminate all those amps traveling through the switch, thus leading to a cooler switch and eliminating the blinking.

[Dragon]

Go see http://www.fordification.com/forum/view ... =8&t=37158

[Chaseman]

Whoa this sounds familiar , to simply agree with everybody . that the headlight switch is overheating form a combination of higher output modern lamps and aging wiring. Solutions are to buy a headlight harness from 390nut or LMC which have relays that take the power instead of the actual switch. Or if your handy with wiring you can set up your own relay set up.