Hazards don't work with headlights on

[Aljohnsonii]

All my lights work but the hazards with headlights on if you cut headlights off they work anyone had this problem

[Aljohnsonii]

all lights work hazards work with headlamp off when i turn them on the hazards stop working anyone had this problem

[VetteVet]

I would check all the battery to frame grounds, and add some if necessary.

[Aljohnsonii]

I did that and changed the headlight switch it's just when I turn headlights on when they stop working

[LockDoc]

Originally Posted by Aljohnsonii

All my lights work but the hazards with headlights on if you cut headlights off they work anyone had this problem

Most problems like that at ground related (or lack of). Read this thread.

http://67-72chevytrucks.com/vboard/s....php?p=4200642

LockDoc

[VetteVet]

Do the brake and rear turns work when the headlights are on? They use the same filaments as the hazards.

[Aljohnsonii]

I redone all the grounds at turnsignals and still no turnsignal with light on

[Wrenchbender Ret]

Try a different flasher. The voltage drop may be enough to cause it not to flash.

[Aljohnsonii]

I sanded all the grounds and changed all fuses and bulbs the passenger side turn signal works with lights on but the driver side doesn't work with the headlights on and the flashers work with headlights off and don't when it's on

[Classic Heartbeat]

Do you have trailer wiring? If so, I suspect thats your problem. WES

[Aljohnsonii]

No trailer wiring

[Aljohnsonii]

This is what I have working :
Turnsignals with headlamp off both side front rear
Hazards with headlamp off front and rear
Parking lights work passenger turnsignal work with headlamp on

Don't work:
Driver side turn signal with headlamp on front or back
Hazards with headlamps on

What I've done :
Added ground to cab removed all lighting grounds and sanded and cleaned ground to tail light housings
replaced flasher relays
sanded fuse panel connections and changed all fuses

[Aljohnsonii]

This is what I have working :
Turnsignals with headlamp off both side front rear
Hazards with headlamp off front and rear
Parking lights work passenger turnsignal work with headlamp on

Don't work:
Driver side turn signal with headlamp on front or back
Hazards with headlamps on

What I've done :
Added ground to cab removed all lighting grounds and sanded and cleaned ground to tail light housings
replaced flasher relays
sanded fuse panel connections and changed all fuses

[LockDoc]

Originally Posted by Aljohnsonii

This is what I have working :
Turnsignals with headlamp off both side front rear
Hazards with headlamp off front and rear
Parking lights work passenger turnsignal work with headlamp on

Don't work:
Driver side turn signal with headlamp on front or back
Hazards with headlamps on

What I've done :
Added ground to cab removed all lighting grounds and sanded and cleaned ground to tail light housings
replaced flasher relays
sanded fuse panel connections and changed all fuses

Do you have ground straps from battery to engine, back of engine to cab, engine to frame, frame to core support, frame to bottom of cab, frame to bed? All ground connections to bare metal? Is the small black ground wire still clipped onto the pinch weld behind the instrument cluster? (It should be on the bottom right hand side)

Couple of other things you might check is the bulb socket contacts. I had one that was rotated in the housing once and the socket contacts were shorting out on the base of the bulb. Also, unplug both headlights, turn on the headlight switch and try the turn signals and hazards again to see what happens. Report back.

LockDoc.

[Aljohnsonii]

Ok I put a ground from bed to frame I didn't have one there because bed was bolted directly to frame metal on metal contact. I unplugged the headlamps and same problem hazards or driver turnsignals not working with head lights on

[Aljohnsonii]

Ok have another thing I just noticed to ad also I turn the truck off leave headlams on and turn the driver turn signal on the flasher blinks/ clicks and the turn lights come on but don't flash. The hazards still don't work in this situation

[LockDoc]

Originally Posted by Aljohnsonii

Ok have another thing I just noticed to ad also I turn the truck off leave headlams on and turn the driver turn signal on the flasher blinks/ clicks and the turn lights come on but don't flash. The hazards still don't work in this situation

What year is your truck? Are the turn signals in the bumper by any chance?

LockDoc

[Aljohnsonii]

1968 gmc the lights are in the grill don't have the a bumper on it

[imjeff]

Corroded headlight switch? It might have power out issues when it's in the headlight on position.

[Aljohnsonii]

New headlight switch new dimmer switch and cleaned all the fuse holders

[kentucky_smith]

I had a similar problem, changing the turn signal switch on the column cured it.

[Aljohnsonii]

I had hooked a new one up and it still done the same thing with the new one but I'll buy another and try it

[Aljohnsonii]

I put a new turnsignal switch in the column and still same probl everything works until I turn headlights on then the driver side turn signals don't work and the hazards don't work if I turn headlight switch off everything goes back to working

[LockDoc]

Originally Posted by Aljohnsonii

I put a new turnsignal switch in the column and still same probl everything works until I turn headlights on then the driver side turn signals don't work and the hazards don't work if I turn headlight switch off everything goes back to working

I'm out of ideas. I'm still thinking it is ground or connection related though. What do you think of having the thread moved to the electrical forum to see if anyone there can come up with a solution?

LockDoc

[Aljohnsonii]

I have one and no one responded