84 quad lights, pass low beam works only with high beam
 

Hello,

I've tried to search but have found no answers, I swear I read it last year while looking at headlight threads.

The passenger side low beam light does not go on. It will only come on with the high beams on.

I've done nothing recently to change anything electrical, I also checked to be sure the ground was good and it was.

Any help would be great, I know it's not the bulb. Thanks in advance!

Rob

Re: 84 quad lights, pass low beam works only with high beam
 

I'll bump this one back up. I recently had the same issue after installing an aftermarket headlight harness. I never did figure out the problem. Maybe someone with an idea on this issue will lead to a solution on mine too.

Re: 84 quad lights, pass low beam works only with high beam
 

Check your connection at the headlights. Could just be a loose connection or wire

Re: 84 quad lights, pass low beam works only with high beam
 

It could also be that the low beam bulb is burned out. Might just need new headlights. But check the connections first.

Re: 84 quad lights, pass low beam works only with high beam
 

My wires are all good, the connections are solid.

I know the bulb works because it comes on when I switch to high beams. I inspected the three prong male side of the bulb and can only see that it might be an internal issue.

All wires are good, connections are good. Just an odd scenario, and seeing how xs-style also has the same issue at least makes me feel like I'm not crazy!

For now I just unplugged the high beams and run the lights on high beams so the low beams can function.

Thanks for the help!

Re: 84 quad lights, pass low beam works only with high beam
 

I would try a new switch, or borrow one that is working, the one that switches from high to low, they cant be that expensive,

Re: 84 quad lights, pass low beam works only with high beam
 

The beams are two completely independent filaments, so one can work while the other doesn't. And I would still fill the connector plug with electrical grease, it wouldn't hurt regardless

Re: 84 quad lights, pass low beam works only with high beam
 

For another weird twist, my lights will work as they should without the harness. They only have the symptoms you have with the relay harness installed.

Re: 84 quad lights, pass low beam works only with high beam
 

The low beam bulbs have two filaments? This would be surprising to hear since there's four lights and I thought there were just single filament bulbs each.

Re: 84 quad lights, pass low beam works only with high beam
 

You guys aren't using LED bulbs by any chance? I know I tried changing all my bulbs over to LED's. Talk about weird issues, I had all kinds of issues. Switched them back and everything was fine.

Re: 84 quad lights, pass low beam works only with high beam
 

Duh, that's right, you have quad headlights. That would only be for a single headlight, they have two filaments.

Re: 84 quad lights, pass low beam works only with high beam
 

I dunno about the op, but I'm just using standard Sylvania bulbs in my case

Re: 84 quad lights, pass low beam works only with high beam
 

In this thread (great thread by the way) look at X8430 and find the quad headlight diagram. There are three pins and two elements in the lowbeam (even in a quad light system). Your one element is burned out, the other is still good.

http://67-72chevytrucks.com/vboard/s...d.php?t=545416

Re: 84 quad lights, pass low beam works only with high beam
 

Thanks for that link, I keep forgetting that hatzie posted all of those schematics. And I'm happy to see I wasn't being a ding-a-ling after all.:metal:

Re: 84 quad lights, pass low beam works only with high beam
 

I also have standard Sylvania bulbs

Awesome thread for sure, thanks for confirming my problem!

Looks like you were right after all!

I ordered another bulb and will post once it's in and hopefully working again.

Thank you everyone for your help!

Rob