Regulator A and/or I Circuit Test

Charging System Schematic:

Charging System Tests
When performing charging system tests, turn OFF all lamps and electrical components. Place transmission in NEUTRAL and apply parking brake.

CAUTION: Do not make jumper wire connections except as directed. To do so may damage regulator.

NOTE: Battery posts and cable clamps must be clean and tight to ensure accurate meter indications.





Regulator A and/or I Circuit Test
With ignition switch in the RUN position (Engine NOT RUNNING), charge indicator (alternator or battery) lamp should be ON.
1. Disconnect wiring connector from regulator and connect a jumper wire from wiring connector I terminal to battery negative post cable clamp.
2. Turn ignition to RUN position with engine OFF. If indicator lamp does NOT light, check indicator bulb for continuity and replace bulb if burned out. If bulb checks good repair open in I circuit of vehicle and check for normal operation.
3. If indicator lamp does light, remove jumper wire and connect voltmeter negative lead to battery negative post cable clamp and contact voltmeter positive lead to regulator wiring connector A terminal. Battery voltage should be indicated. If battery voltage is NOT indicated, service A circuit wiring.
4. If battery voltage is indicated, clean and tighten ground connections to engine and alternator.
5. Turn ignition to RUN position with engine OFF. If indicator lamp still does NOT light, service complete alternator/regulator assembly.