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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Wiring Systems (General Information)) >> Diagnostic Information and Procedures >> Testing for Continuity >> With a Test Lamp

With a Test Lamp

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Important:  Only use the test lamp procedure on low impedance power and ground circuits.

  1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.
  2. Disconnect the load.
  3. Connect 1 lead of the test lamp to 1 end of the circuit to be tested.
  4. Connect the other lead of the test lamp to battery positive voltage.
  5. Connect the other end of the circuit to ground.
  6. If the test lamp illuminates (full intensity), then the circuit has good continuity.
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