Brake/Signal Light Problem

[Hack Richards]

1982 K1500
Front Parking, running and signal lights work front Hazard Lights work

Rear Parking lights and running lights work and Back up lights work

Rear signal, rear hazard, and rear brake lights DO NOT WORK bulbs are good

What do the rear signal and brake lights have in common that would cause this? Brake light switch or something with the signal switch??

Thanks in advance

 

[Ricko1966]

1982 K1500
Front Parking, running and signal lights work front Hazard Lights work

Rear Parking lights and running lights work and Back up lights work

Rear signal, rear hazard, and rear brake lights DO NOT WORK bulbs are good

What do the rear signal and brake lights have in common that would cause this? Brake light switch or something with the signal switch??

Thanks in advance

The turn signal switch and the signal/brake wires them selves wires them selves. Signal and brake use the same wire and bulb filament. Have you checked the bulbs?

 

[TotalyHucked]

Have you checked the grounds at the back of the truck? Things start going funky when there's a ground issue

 

[Ricko1966]

Have you checked the grounds at the back of the truck? Things start going funky when there's a ground issue

He's got working taillights,they use the same ground

 

[TotalyHucked]

He's got working taillights,they use the same ground

I've had a not-so-ideal ground cause a similar issue. Same circuit but only one function out of 3 would work.

Could be a weird combo of problems. Brake light switch and both the turn signal and hazard relays are dead?

 

[Matt69olds]

Push and pull the hazard switch a few times. Sometimes that gets rear turnsignal/brake lights going again.

Check for power on the WHITE wire at the turn signal switch connector while pushing the brake pedal. If you have power on the white wire, check for power on the yellow and green wires, while pushing the brake. If you have power on those, the problem is somewhere between the turn signal connector and the rear of the truck. If you have no power, replace the turn signal switch.

 

[Jgonick]

The turn signal switch supplies power to the green & yellow wires running to your brake lights. The power can come from one of three wires. White - for brakes. Purple- turn signal, or Brown - hazards. So, since none of those work, it is likely a turn signal switch problem or both the green (right) & yellow (left) wires running to brakes lights are the problem- disconnected/not making connection from turn signal switch to brake lights for some reason. same as what @Matt69olds pointed out