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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the stop lamp switch.
  2. Verify that a test lamp illuminates between the voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, also test the signal circuit for a short to ground.
  3. Install a 3-amp fused jumper wire between the signal circuit and the voltage supply circuit. Verify that the stop lamps are ON.
    • If the stop lamps are not ON, test the signal circuit for an open/high resistance. If circuit tests normal, test or replace the brake lamp bulb.
  4. If all circuits test normal, test or replace the stop lamp switch.
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