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Home >> GMC >> 1990 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> DISC & DRUM (C, G, K, P, R & V Series) >> Testing >> Brake Warning Light System Testing >> Electrical Circuit

Electrical Circuit

Disconnect wire from switch terminal and ground wire to chassis. Turn ignition on. Warning light should come on. If light does not operate, bulb or wiring circuit is defective. Replace bulb or repair wiring as necessary. If light operates, turn off ignition and connect wire.