Headlights flickering. What gives?

[FrankR]

I have a 76 Itasca 20'. It is a Chevy van frontend. After the lights have been on a while, they started to flicker very bad going completely off at times. We have replaced the headlight switch and the dimmer switch, but the problem is still there. We have tried jiggling wires around each when this happens but we just can't seem to nail down where the problem is.

[n9iui]

Headlights run through a relay. It could be wearing out. Trace your wiring back from the headlights. If the lights are rapidly flashing, it may be possible that you could hear the relay clicking? Maybe? I've never tried finding one with my ears but it might be worth a try.

[TXiceman]

Bad relay, loose or corroded wire or bad ground.

ken

[FrankR]

Does anyone know if these have a relay on the inside? I traced wires under the hood and they go straight to the lights.

[Gary - K7GLD]

Quote:

Originally Posted by FrankR Does anyone know if these have a relay on the inside? I traced wires under the hood and they go straight to the lights.

Maybe inside on the firewall - near the main engine fuse panel?

[ronspradley]

The auto parts store should have a schematic of where the relay is located..................but I would surely check the ground and connections first...............ronspradley

[bigskymt]

Is it only the headlights or do the dash, tail and park lights flash also? Hi/Lo Beam identical?
If it's only the headlights you can trace the wires back to the junction block mounted on the engine side of the firewall just to the L (drivers side) of the steering column.
I'm unaware of any relay in your model. The headlight switch has an auto reset circuit breaker incorporated in the switch. The output runs to the dimmer switch on the floor then off to the headlights.
On your model both headlight ground wires run to one which is bolted to sheet metal ground......I think on the radiator support.