Brake lights

Asked by GuruT4ZK4 Jun 06, 2018 at 01:24 PM about the 1990 GMC Sierra 1500

Question type: General

I have a 1990 Chev p/u brake lights don't work . Fuses / Bulbs and Brake light switched replaced still nothing .Turn signals and running lights work also no 4 way flashers ?

Any thoughts ?

1 Answer
27,570

oilyspill answered 6 years ago

Did you use a test lite and check voltage at stop fuse? At the stop lamp switch, orange wire is voltage to stop switch for stop lamp. When switch is activated white wire carries voltage to turn signal switch for stop lamps. The lower brake lites are wired through the turn signal switch. At the rear, the stop and turn use the same bulb filament, just, not at the same time. Anything electrical check voltage and ground, first. Because turn works, I think ground is ok. My wiring diagrams on this model year aren't great.

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