Question about 1999 GMC Suburban
Have you looked under rear of truck for broken wires? Anyone ever installed trailer wiring? Check at brake switch for juice.
Posted on Jan 13, 2015
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Posted on Jan 02, 2017
Check for power out of brake light switch by brake pedal. Of its faulty , the 3rd brake light will still work. Hope this helps
Posted on May 23, 2009
SOURCE: No brake lights on 95 Suburban
Disconnect electrical connector to brake switch brake located near brake pedal. Check for twelve volts or power with a test light on one side. If power, get a piece of wire, strip the ends and plug into each end of connector. If brake lights works, switch is bad. If not, check bulbs and power in the brake light socket. If no power, check to make sure power is leaving the trafficator switch as the brake light switch is depress or bypass. Check for broken or bad connection along circuit. If all good, you could have a trafficator switch problem. Oh, are the hazard and trafficators working in the rear? If they are, the trafficator switch is bad because the brake switch sends power there, then out to the back through the left and right rear trafficator wires.
Posted on Jun 14, 2009
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