Headlight wiring question

[81 prostock mirada]

So when I turn my high beams on it turns off all the lights in the front blinkers included. Any thoughts on why?

 

[Hayzoos]

Just the front? Are the tail lights still on?
Does your car have the foot switch or the stalk switch for high beams?

 

[Hayzoos]

I'm thinking that there is a short in the high beam circuit somewhere. The headlight switch (not high beam switch) has a self-resetting circuit breaker internally.

Try unplugging both high beam headlights and then switch the high beams on. If all the other lights stay on then, yes a short in the headlight (or connector). Then try each headlight separately unplugged. That will narrow it down to which side has the issue.

I have seen both bad connectors and bad headlights cause problems.

 

[Duke5A]

Ground wire on the inner fenders is jacked.

 

[Hayzoos]

@Duke5A - Yeah, probably ground issue, but I have been blaming bad grounds a lot lately.

 

[GregG48213]

turns off all the lights

I had a similar problem with my '88 Diplomat. When I turned on the high beams, the headlights would go out. Pretty exciting on a hilly two-lane blacktop! It turned out the wire going to one high-beam had worn through the insulation and grounded out right behind the headlight.