Regulator Power Source Test
NOTE:
Alternator wiring plug must be disconnected for the following test.
- Disconnect alternator wiring plug. Turn ignition switch to "ON" position (engine not running). Connect positive voltmeter lead to alternator wiring plug terminal "S". See Fig 1. Connect negative voltmeter lead to alternator rear housing.
- If reading is same as battery voltage, proceed to ROTOR FIELD COIL TEST. If reading is less than battery voltage, problem is indicated between terminal "S" wire and battery.