Alternator: Description and Operation

I CIRCUIT
The I (ignition) circuit:
- Turns the voltage regulator on when the ignition switch is in the RUN position.
- Turns the charge warning indicator on if there is a problem in the charging system.

A CIRCUIT
The A (battery sense) circuit:
- Senses the battery voltage. The voltage regulator uses this to determine the generator output.
- Supplies current to the generator field coil.
- Is ALWAYS HOT
- Is protected by a fuse in the power distribution box.