My headlights started flickering recently and then shut off. If I drive for 10 to 15 minutes with the lights on, with 15 minutes, the tow headlights will flcker and then go off. The running lights, interior lights intrument lights all remain intact.

Any suggestions what this is and how to solve it.

 

Your headlight switch is failing. There's a built in circuit breaker, and when it overheats it breaks the circuit. Once it's cooled down they work fine again. You might have a dirty ground or connection in the system that's making it happen, but chances are the metal in the circuit breaker is fatigued from age.

 

Thanks for the response. If the running lights, interior, and intrument panel lights are also controlled by the switch, wouldn't they flicker as well? Don't mind replacing the switch, just want to make sure that's the culprit.

 

You said “flicker”, not “turning on and off”.

The circuit breaker in the switch would cause turning on and off.

Does the flickering occur at low RPM only, or all engine speeds?

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Happy Racing!

 

Ok, flicker, off and on... in my case, the same thing, then the lights go off untill I turn them off and wait and turn them back on again, then the cycle begins again.

 

No, because there are multiple circuits running through the switch, and the internal breaker is only between the power source and the headlights. The rest of the lights have their own circuits within the switch.

 

on my 91 firebird. I am having simular issues. the entire lighting system works off of one power source. that of which I can not find. mine only work because the previous owner made a direct bridge to the fuse box from the battery. otherwise they do not work. interior, headlamps tail lights none of it. so to have their own circuts is in correct in my case as well.
Just so you know I am frustrated with the issue Have gone through the entire harness to try and locate the issue.