Jan 212015

when headlamps on, brake lamps come on. when brake applied, taillamps come on. replaced brake switch at pedal, no change. removed trailer light pigtail at bumper, no change. Please help. This is my daily driver.

  One Response to “2004 chevy silverado 1500”

  1. Sounds like the wrong bulbs have been installed. 3057 instead of 3157. See this often. May not be the case but would be the first thing I would check.

    If it has any wiring for a trailer left, check for a short at that location.

    If that is not the case, grab a wiring diagram and start tracing the wires.

    How to Use a Multi-meter

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