Generator Circuit Description

BATTERY POSITIVE VOLTAGE (B+) OUTPUT THE B+ CIRCUIT (CIRCUIT 38):
- Supplies the generator output current to the power distribution box.
- Is always hot.

I CIRCUIT
The I circuit, circuit 904 (LG/R):
- Turns the voltage regulator ON when the ignition switch is in the RUN position.
- Turns the generator warning lamp ON if there is a problem in the charging system or associated wiring.

A CIRCUIT
The A circuit, circuit 36 (Y/W):
- Is used by the voltage regulator to sense battery voltage (B+).
- Supplies current to the generator field coil.
- Is always hot.
- Is protected by a fuse in the power distribution box.

S CIRCUIT
The S circuit, circuit 4 (W/BK):
- Is used by the voltage regulator to sense the generator (stator) output.

Voltage is typically one-half of battery voltage when the generator is operating.

NOTE: If the S circuit is open or disconnected, the generator warning lamp will turn ON, even if the generator is operating normally.

The generator warning lamp will turn ON if the S circuit voltage is zero. The warning lamp will turn OFF if the S circuit voltage is greater than 5 volts.