headlight problems
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Freshman User
Joined: Apr 2006
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headlight problems
Hello all,
I have a '66 F100 custom cab long bed, my problem is that the headlights blink. When the truck is cold they are fine for about 15- 20 minutes, then they blink very evenly like they are hooked to a flasher. I have had the truck for about 7 years. The truck did this at first, but not very often. I replaced the hi-lo switch with only slightly better luck, still fashing but less often. After letting the truck sit for 2yrs it is as I described above. The ignition switch has been replaced somewhere along the line, but the headlight switch is unknown, if it has been replaced it is with one that looks stock. the only other thing that has been changed is it has an electrical brake light switch that I have replaced since then. different problem, same status on the headlights. I just don't want to chase parts if at all possible. And i did check the connections.The brake lights don't blink when this happens. I think thats all. Any ideas? Need more info?
Thanks, kris
I have a '66 F100 custom cab long bed, my problem is that the headlights blink. When the truck is cold they are fine for about 15- 20 minutes, then they blink very evenly like they are hooked to a flasher. I have had the truck for about 7 years. The truck did this at first, but not very often. I replaced the hi-lo switch with only slightly better luck, still fashing but less often. After letting the truck sit for 2yrs it is as I described above. The ignition switch has been replaced somewhere along the line, but the headlight switch is unknown, if it has been replaced it is with one that looks stock. the only other thing that has been changed is it has an electrical brake light switch that I have replaced since then. different problem, same status on the headlights. I just don't want to chase parts if at all possible. And i did check the connections.The brake lights don't blink when this happens. I think thats all. Any ideas? Need more info?
Thanks, kris
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Sounds like you have a weak Circuit Breaker in your Lighting Switch.
I would replace the Lighting Switch unless you have extra lights added to your Headlight circuit. In that case I would remove the extra load and use a relay.
I would replace the Lighting Switch unless you have extra lights added to your Headlight circuit. In that case I would remove the extra load and use a relay.
Senior User
Joined: Jan 2006
Posts: 434
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From: Little Falls,New York
I have the same problem w/ my '73.I replaced the headlight switch,but no improvement.Could be wires getting hot-I've heard sometimes this problem creates fires.Sorry,don't know the fix,but I would love to.
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
The problem is the older head lamp switches are not designed to take the load of the newer halogen lamps. What you need to do is rewire your head lamps with a relay drawing directly from teh battery.
See the tech article "brighter whites" or buy a head lamp harness from Summit. Though they use only 18 ? gauge wire, I would use a min of 14.
See the tech article "brighter whites" or buy a head lamp harness from Summit. Though they use only 18 ? gauge wire, I would use a min of 14.
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Freshman User
Joined: Apr 2006
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thanks
Thanks everyone for the help. I bought the new switch and am going to put it in on my day off this week. I will let you know how it goes. Bill(subford) small world, I did not see where you were from when i first read your reply. I am originally from Leavenworth. My mom lives in easton about a block from the post office. Thanks, Kris
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