damn , I can,t figure this out driving turn head lites on a few minutes later head lites flashing on and off like I,m using the emergency flasher , any one have this trouble ??
I would think it is likely a ground issue. Something is causing a bit more resistance than the system is designed for. The extra resistance causes something (perhaps the same item, perhaps not) to heat up until it it expands enough to open the circuit. Once the circuit opens, no current is flowing and said part cools back down and contracts until the circuit is once again complete. Rinse and Repeat. Turn your lights on, and start feeling around for something hot, perhaps a switch, relay, connector, ground stud, etc.
Some headlight switches have built in circuit breakers, so when the current is too high, it shuts off, then cools down and turns back on. you could give us a lot more info about the car, so we might be able to help you figure out what's going on.
If it's a stock type headlight switch, GM or Ford, either, the circuit breaker in the switch is bad. Turn them on high beam and it will probably start flashing sooner since it is drawing more amperage. Be careful if you try to touch it. They get hot.
Yes, very likely the circuit breaker doing its thing to protect the wiring...you have something in the lighting circuit to ground
Old pick up I used to have started doing that, on mine it was the floor mounted dimmer switch. Replaced it and problem was gone. ....
I had that problem at one point too. Couldn’t find anything wrong checking the wiring and switches. Added relays and never had the problem again.
I'll bet you got some blinker fluid mixed into your headlight grease. Flush them out and refill with the correct juice.
I just went through this with a slightly off topic GM car. Low beams always were fine, high beams would flicker after they were on for about 4 minutes. I replaced the headlight switch, no change, I did the dimmer switch as well, no change (and I bought an NORS Made in USA one too, I've heard some of the new replacement ones are shit) I changed every headlight bulb with some NORS ones I had, cleaned every connection, etc. I checked grounds and even added a couple more. The wiring in that particular car was comically small gauge for the headlight circuit, and it ran from the engine compartment inside to the switch, then to the floor switch, then back out to the headlights, an awfully long way to go through tiny gauge wire, lots of room to add up tiny bits of resistance until the breaker just couldn't handle it. I got frustrated and added relays, that did fix the problem. I did a proper job, with heavier gauge wiring and inline fuses and whatnot. It did feel like a copout, since at one time, the original system did work, but I couldn't find any other faults. Without knowing what your vehicle is and what parts it uses, it's really hard to say. But those are the things I checked/replaced and that's what eventually cured the issue.
My 64 Olds did this exact thing. The negative battery cable had a smaller 8 or 10 ga wire to the body. It was all frayed away. Of course flashing happens when State Patrol was passing by.
My 54 Buick with halogen bulbs did that after a few miles with the headlights on. The lights would start to go off and on about every 30 seconds. It was the circuit breaker on the headlight switch. I cleaned the points on the breaker and bent the part that the points were attached to just a little, to put more pressure on the points. Fixed the problem. I also put a 30 amp fuse after the switch in line to the dimmer switch as a safety, if the breaker didn't work in case of a short.
Everybody likes to throw shit at the wall , especially big they're clueless . In this case due to lack of info , everyone is clueless .
Had this happen with a brand new headlight switch after just 6 months. I got to a auto parts store and bought a new headlight switch and swapped it out in the parking lot. It was a typical 60's GM style headlight switch, and once replaced the problem never happened again.
My 57 has a block on the fender apron that all the wires for headlights, park lights and signals lead into. Maybe something loose or cracked?
Install relays. I run one for high, and another one for low. I run thermal breakers, but one for each filament. Yes, it's overkill, but I never have problems.
The Jalopy Journal
