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JA
DESCRIPTION AND OPERATION
CHARGING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION
CHARGING SYSTEM
The charging system is an integral part of the bat-
tery and starter systems. Since these systems work
together, any diagnosis and testing should be done in
conjunction.
The charging system is protected by a 12 gauge
(2.5L) or a 10 gauge (2.0L, 2.4L) fusible link located
in the A11 circuit. The fusible link is spliced into the
A0 circuit. The A0 circuit is connected to the battery
feed terminal of the Power Distribution Center (PDC)
and the engine starter motor.
The generator is case-grounded through its attach-
ing bracket. This generator uses a voltage regulator
internal to the Powertrain Control Module (PCM).
When the vehicle is running, battery voltage is
applied to the generator field terminal through the
A142 circuit, on all engine applications. This circuit
is controlled by the contact side of the Automatic
Shut-Down (ASD) relay. The ground, or voltage reg-
ulated side, of the generator field is controlled by the
K20 circuit. Circuit K20 connects to cavity 4 of the
PCM.
8W - 20 CHARGING SYSTEM
8W-20 CHARGING SYSTEM
INDEX
page
When there is current present in the field, and the
rotor is turning, the stator in the generator produces
a B+ voltage that is supplied to the battery through
the A11 and A0 circuits. The A11 circuit is connected
to the output terminal of the generator and spliced to
the A0 circuit. The A0 circuit is a direct battery feed
from the PDC to the engine starter motor.
Grounding for the system is accomplished at the
battery negative terminal. These grounds go to the
engine and body.
HELPFUL INFORMATION
• Inspect for a blown fusible link in the A11 cir-
cuit between the generator and the battery positive
terminal.
• For additional information on charging system
diagnosis, refer to the appropriate group of the Ser-
vice Manual.
8W - 20 - 3
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