Brake light troubleshooting

[Marc Rexroad]

Just bought a 79 c30. Taillights and turn signals work but brake lights dont.

Checked the brake light switch and it is working properly with power only when pedal is pressed.

Checked for power thru the firewall and there is none when brake is applied.

Turn signal will not stay on and switch feels all messed up. Hard to engage.

Thoughts?

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[Ricko1966]

I believe that turn signal switch interrupts power to the brake light when the turn signal is on.I would verify that my turn signal switch was operating properly.Fwiw I mounted a momentary contact switch as in universal horn button on my floorboard, wired it to the brakelights and the battery once when I was like 16 it was my choice if my brakelights came on.Arent teenagers clever.But it would get you by temporarily.

 

[Marc Rexroad]

Thanks for the feedback. I am confused on how to check the turn signal switch. I found the main harness with the plug in and verified everything there.....but how do I check it after the switch?

 

[Matt69olds]

Push and pull the hazard switch a couple times, then check your brake lights. Sometimes the hazard switch causes funky light issues.

Check for power at the white wire of the turn signal switch with the pedal pressed. If it’s good, check for power at the green and yellow wires. If you have no power on those wires with the pedal pressed, the turn signal switch is defective.