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Circuit/System Testing

CAUTION: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
  1. Disconnect the 3-phase cables from the SGCM. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  2. Test each of the 3-phase cables for a short to ground.
    • If all circuits test normal, replace the SGCM.
  3. Disconnect the 3-phase cables from the MGU. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
  4. Test each of the 3-phase cables individually for a short to ground.
    • If all circuits test normal, replace the MGU.
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