Sable V6-3.0L VIN U (1999)
Alternator: Description and Operation
Generator Circuit Description
GENERATOR CIRCUIT
Battery Positive Voltage (B+) Output
The generator output is supplied through the battery positive voltage (B+) output connection to the battery and electrical system.
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.
S Circuit (If equipped)
The S (stator) circuit:
^
Is used by the voltage regulator to sense the generator (stator) output.
^
Voltage is typically one-half of battery voltage when the Generator (GEN) is operating.
NOTE: If the S circuit is open or disconnected, the charge warning indicator will turn on, even if the generator (GEN) is operating normally.
The charging warning indicator will turn on if the S circuit voltage is zero. The warning indicator will turn off if the S circuit voltage is greater
than 5 volts.
The set voltage will vary with temperature and is typically higher in the winter than summer, allowing for better battery charging.
