You most likely need to replace your headlight switch. Can you hear a small click when they flicker too? Listen carefully by your headlight switch next time that happens and if that's the case, then the switch is bad. The circuit breakers are switch back and forth between open and close. Is it the original switch? You can get the switch at autozone or somewhere for cheap. Less than $20.
Flickering headlamps
The headlamps on my '66 coupe began flickering along with my dash lights and courtesy lights. When
I test the voltage with the lights off, the reading is a pretty steady 14.5v at the battery. When I test it with the lights on, the voltage seems to fluctuate between 13.0v and 15.5v. Does this seem like a regulator problem or maybe a grounding problem somewhere in the wiring? :scratchchin
I test the voltage with the lights off, the reading is a pretty steady 14.5v at the battery. When I test it with the lights on, the voltage seems to fluctuate between 13.0v and 15.5v. Does this seem like a regulator problem or maybe a grounding problem somewhere in the wiring? :scratchchin
1 - 7 of 7 Posts
This happened also on my '70 years ago, the switch is the fuse/relay also and as it gets old it can't carry the load so the lights will go off until the switch cools and come back on until it gets hot again. The switch gets hot to touch from what I remember also.
Jon
Jon
Rectify the whole problem by upgrading it to the Relay system and take the heat off the HL switch
Daniel Stern Lighting Consultancy and Supply
Daniel Stern Lighting Consultancy and Supply
Mine was a weak ground along the radiator wall. Caused a weak flickering passenger side headlamp. Simple check.
I had a problem like that, but it was the high beam switch on the floor. The connections to it were loose and oxidized. All I did was clean it up and squeeze the sta-kon connector tighter. It's been fine ever since.
one of my '68 Mustangs had headlights + interior lights that would surge from dim to bright. The issue was especially noticeable at idle. I simply replaced the voltage regulator and the problem was solved.
1 - 7 of 7 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Ford Mustang Forum
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
