Question about 1989 GMC Sierra

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No brake lights or backup lights

Signal lights are working,no brake lights or reverse lights.checked brake switch-working fine.brake light on dash is on,goes out when abs is disconnected.checked brake fuse on panel,power only when ignition is on.checked bulbs ,all working.is it possibly in the signal switch?

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Did you check the back-up switch on the tranny, or the grounds??

Posted on May 27, 2009

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