Brake, but no blink

SentandBent4x4 · Oct 16, 2023

Howdy Ya'll,
I got a 1992 Chevy Silverado, and I am having issues with the rear and front blinkers. the rear blinkers don't work at all, and I'm not sure if the brake lights do either. The front blinker on the driver's side works in the parking light, but not the little side light, and the passenger side is exactly opposite. Then, if the lights are on, only the left blinker works. It's safe to say I'm baffled. I don't even know what to try first!

Drunkcanuk · Oct 16, 2023

Check ALL your grounds. That will be the most common answer by far. There was a post not long ago that had "sections" of the truck and where they were located.

fancyTBI · Oct 16, 2023

Off the top of my head (consult the FSM):

-Ground for each headlight on the core support near the radiator (passenger side might be by the battery, I’ve seen them both ways, not sure which is OE)

-Ground on the rear of the frame by the tail lamp harness plug. If you have a trailer harness between those two plugs, it is probably suspect.

- There are others (cylinder head to firewall/frame, battery/intake, CTS ground, filler neck to bed (frame?)

It is also worth your time to inspect the head/tail light housings for corrosion in either the socket or on the circuit boards for the tail lights.

31 years old and probably original wiring. I believe you’re in the rust belt? Stuff is bound to degrade where we live. If it feels like a wet noodle, replace it. Bad grounds can cause weird issues.

GoToGuy · Oct 17, 2023

No kids, significant other to step on brake pedal? Check at night close to a flat surface , if one brake light does not come on you'll know. What lights are illuminated with headlights on?

Schurkey · Oct 17, 2023

Perhaps a moderator will move this thread out of "Engines" and into "Audio + Electronics".

FIRST, pull all the bulbs out and look for broken filaments. Some bulbs have TWO filaments, if one is broken the other still lights up.

When one light goes out in your house, do you change the bulb or start dissecting the circuit-breaker box and tearing down sheetrock?

SwaggyT · Feb 8, 2024

fancyTBI said:
Off the top of my head (consult the FSM):

-Ground for each headlight on the core support near the radiator (passenger side might be by the battery, I’ve seen them both ways, not sure which is OE)

-Ground on the rear of the frame by the tail lamp harness plug. If you have a trailer harness between those two plugs, it is probably suspect.

- There are others (cylinder head to firewall/frame, battery/intake, CTS ground, filler neck to bed (frame?)

It is also worth your time to inspect the head/tail light housings for corrosion in either the socket or on the circuit boards for the tail lights.

31 years old and probably original wiring. I believe you’re in the rust belt? Stuff is bound to degrade where we live. If it feels like a wet noodle, replace it. Bad grounds can cause weird issues.

-Ground on the rear of the frame by the tail lamp harness plug. If you have a trailer harness between those two plugs, it is probably suspect.

THANK YOU FOR THIS. I was wondering why it looked like the last person spliced all those wires and grounded them all.

Brake, but no blink

SentandBent4x4

I'm Awesome

Drunkcanuk

I'm Awesome

fancyTBI

Some of my trucks run and drive

GoToGuy

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Schurkey

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SwaggyT

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