Generator Circuit Description
BATTERY POSITIVE VOLTAGE (B+) OUTPUTThe 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.