Generator Load Test
NOTE:
In order to check the charging system, the use of Rotunda Starting and Charging Tester (VAT-40) 078-00005 or equivalent tester is suggested. Refer to the Rotunda Starting and Charging Tester VAT-40 Test Procedure Manual for complete directions on checking out the charging system. Battery posts and cable clamps must be clean and tight to ensure accurate meter indications.
NOTE:
When performing charging system tests, turn OFF all lamps and electrical components. Place transmission in PARK and apply parking brake.
CAUTION:
Do not allow any metal object to come in contact with the housing and internal diode cooling fins with key on or off or short circuit will result and burn out diodes.
- Switch the Rotunda Starting and Charging Tester VAT-040 (078-00005), or equivalent, to the ammeter function.
- Connect the positive and negative leads of the Rotunda Starting and Charging Tester, or equivalent, to the battery.
- Connect the current probe to the generator "B+" output lead (Black/Orange wire).
- With the engine running at 2000 RPM, adjust the Rotunda Starting and Charging Tester (VAT-40) 078-00005 or equivalent load bank to determine the output of the generator. Generator output should be greater than the graph. See Fig 1. If output is not as specified, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.