Indicator Lamp System

Charging System Schematic:

Normal Charge Indication:
The Integral Alternator Regulator (IAR) has a circuit in the regulator that will indicate a high battery voltage condition. With this IAR system four conditions can cause the charge indicator lamp to come on during vehicle operation:
1. No alternator output: damaged alternator or regulator.
2. Over voltage condition: shorted alternator rotor or regulator
3. No connection at alternator output terminal (B+).
4. No connection at battery voltage sensing terminal (A terminal).

If the system is working normally, the following conditions will be present:
1. With ignition switch in the OFF position: Charge indicator battery symbol lamp is OFF.
2. With ignition switch in the RUN position (engine not running): Charge indicator (alternator) lamp is ON.
3. With ignition switch in the RUN position (engine running): Charge indicator (alternator) lamp is OFF.





Indicator Lamp Testing:
1. If charge indicator lamp does not come on, disconnect wiring connector from regulator.
2. Connect a jumper wire from wiring connector I terminal to battery negative (-) post cable clamp.
3. Turn ignition switch to RUN position with engine OFF. If indicator lamp does NOT light, check for presence of lamp socket resistor. If resistor is present, check for contact of lamp socket leads to the flexible printed circuit. If good, check indicator lamp for continuity and replace lamp if burned out. If lamp checks good, perform Regulator I Circuit Test.
4. If indicator lamp does light, remove jumper wire and reconnect wiring plug to regulator. Connect voltmeter negative lead to battery negative post cable clamp and contact voltmeter position lead to regulator A terminal screw. Battery voltage should be indicated. If battery voltage is NOT indicated, service A circuit wiring.
5. If battery voltage is indicated, clean and tighten ground connections to engine, alternator and regulator.





6. Turn ignition to RUN position with engine OFF. If indicator lamp still does NOT light, replace regulator.