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98 Chevy farm truck no brake lights

M

morgan in ar

Member
It's got me stumped. I have both turn signals, and my brake controller works. The brake light relay clicks, but I also swapped it with the Ac relay to check. Still no brake lights.... what do you think?
 
Under the box where the wires branch to left and right side just in front of the rear bumper.
If I remember I had geese one time that did it to
 
(quoted from post at 13:47:25 10/02/16) But then my brake controller shouldn't be working?
Click to expand...

Ok. How about bulbs?
Does your model have separate bulbs for the turn signals?

Is this a pick up or larger truck?

Tom
 
Just a thought could there be two wires back there ? One that works for the turn signal and one that works for the brakes. It's been a while but just thinking on your trailer hook up there is a different pin for each function I think.
 
Does the centre brake light work, the one on the cab?? If it does I'd put money on a bad turn signal switch... had to do the one on my dodge... turn signals worked but no brake lights...
 
Those trucks have 4 wires. Left right tail and ground. If you hit the brakes with the 4 ways on, then the lights go solid(no more flashers). To the OP, see what happens if you hit the brake pedal with the 4 ways on. Do the 4 way indicators on the dash go solid?
 
try blowing air in turn signal switch. work turn signals back and forth, if brake lights do not work you need new turn signal switch with info you supplied. david 40 year ase mastertech
 
Did you check the fuses. You have not answered that. Also that single wire farmer mentioned is for real. I had mine break and had intermitend brake lights and it will blow the fuse under the hood.
FYI you can have turn signals and no breaks on that series of truck I had a 97 3500
 
Agreed. Mine failed with the same symptoms. I added a microswitch with a long lever to the brake pedal and jumped the wiring across the old switch as a temporary fix. That was 3 years ago and it still works fine.
 
On my 1989, there is a ground wire back by the bumper, got pulled out- I had nothing on the back at all. Seems it made something act funny on the dash, too, like the heater controls panel flashed with the turn signal, or something.

Blew the fuse for the brake lights on my 1986 Chevy- it made the dome light come on all the time. I didn't know better, so I removed the bulb. Got pulled over on the way home on my very first date with my future wife that night. Cop let us off- how much better things might have turned out if only he had locked me up...for her that is.
 
(quoted from post at 20:55:29 10/02/16) Those trucks have 4 wires. Left right tail and ground. If you hit the brakes with the 4 ways on, then the lights go solid(no more flashers). To the OP, see what happens if you hit the brake pedal with the 4 ways on. Do the 4 way indicators on the dash go solid?
Click to expand...
I have a Ford Dump Truck (LT9000) that if you hit the brakes with the 4 ways on the brake lights stay on but no more flashing. What would be the cause of that?
DWF
 
I'm here, and your there, but --- I'm leaning in the direction of your turn signal light switch with a bad connection or contact.
Tim in OR
 
Yes. I checked the fuse. I'm pretty sure this one has 4 wires in back: tail, left, right and ground. There is a fifth wire, but that is from the controller for trailer brakes.
 
The tail light housings go bad in those trucks, there are printed circuit boards between the connector and the bulb sockets. This is why NAPA stocks new ones. Pin out the connector to the sockets, you'll probably find that they're bad. If by chance they're good, the brake lights run through the turn signal switch in cars that share brake lights with turn signals. I've seen the switch go bad inside.
 
The 4 ways (and blinkers) use the same bulbs as the brake lights. The brakes lights would take precedence
over the 4 ways, and obviously the lights can't blink and be solid at the same time, so they go solid. I
have no idea how the blinkers and brake lights work. Just the way it's set up, the blinkers take
precedence over the brake light.
 
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