High beam headlight flicker

[zr1vp]

While driving after dark last night with the high beams on they all of a sudden developed a flicker. If I only had the low beams on everything was ok. Nothing else (radio, dashlights) was effected, only the high beams. Ideas?

'67 L71 Coupe

 

[IH2LOSE]

could you tell if it was just one bulb or both, I would say a loose conection in the headlight buckets ,Look at the wires where they attach into the plactic connector not just the plastic connedtor to the bulb it self.Clean up good while you have them apart

 

[zr1vp]

It's both headlights. I've checked the bucket extention connections on both headlights and the problem appears to be upstream from there.

 

[Mac]

Could it be that your battery was getting low? Sometimes you'll get flicker when your alternator being pushed.

-Mac

 

[JohnZ]

Since the headlights have no fuse by design, there's a self-resetting thermal circuit breaker inside the headlight switch as a safety feature; if you develop a short in the power feed to the headlights while driving at night, it opens, shutting off the lights, then closes again, opens again, etc., cycling the lights on and off rapidly so you aren't caught suddenly in the dark at speed with no lights at all. You probably have a chafed power feed wire somewhere between the headlight switch and the lamps that's shorted to ground.

 

[zr1vp]

I replaced the headlight switch last night and the problem is fixed.