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LY7 Engine

  1. Verify that a test lamp illuminates between the G13 generator B+ terminal + X2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  2. Ignition OFF, disconnect the harness connector at the generator.
  3. Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Engine running, test for greater than 3.5 V between the control circuit terminal 1 and ground.
    • If less than the specified range, test the control circuit for a short to ground, an open or a high resistance. If the circuit tests normal, replace the K20 ECM.
  5. If the circuit tests normal, test or replace the G13 generator.
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