Hazards feeding on to brake lights

If you are probing you test light at the tail lights know that there are only 3 wires. Ground, clearance and stop/turn. Turn and stop feed through the same wire.

Other than that little useless information I'm not much help. Other than check your ground wires. A missing or bad ground can do funny things

 

On older stuff with the signal stat turn signal switch on the column the override of brake lights by the turn/4 ways occurs in that switch. So the brake light signal goes into that switch from the brake air sendor, and then out of that switch to brake lights. When the turn signal or hazards are on different contacts make the connection. I'm not explaining this well, but it may be as simple as installing a new turn signal switch.

I'm with Lester on checking grounds, and I have no idea where this is done on your WS, but it would be worth testing the wires in and out of your turn signal switch if you can locate the pigtails going to it.

 

Thanks for that explanation oxbow, I thought that all happened in the signal stat but wasn't sure. A 14 may have some sort of module but thats way newer than my stuff.

If ALL of your blinkers and clearance lights are working I wouldn't expect a ground issue. But if you have any lights not working fix them first. I've often had blinkers act strange and It is almost always a broken ground wire.

 

All the 73-87 Chevy pickups did this exact thing .

I think it’s based on where the brake light power feeds into the harness , if it’s after the turn signal switch , then it over rides the turn signal .

 

By god you're right, I remember that now.

Maybe that's just the way his Western Star is wired and nothing is wrong?

 

Does this happen on truck and trailer?
Disconnect pigtail, checking to see if problem is in tractor or trailer.

Disconnect all tail lights and check wire harness. Could be a short in a tail light.

My first guess is a grounding issue.

 

So your front and side turn lights stay on solid with the brake pressed also?

 

I'm looking thru my notes and can't find it.
Take the bottom cover off the signal stat.
If I remember right, there is a red wire that you need to cut and that will cure the problem.
There is a tech bulletin on this.
This will fix the problem.
I'll keep looking for it.

 

DONT CUT THE RED WIRE!!!!!!