Charging System: Description and Operation

The charging system is an integral part of the battery and starting systems. Because all these systems work in conjunction, diagnose and test them together.

Circuit All connects to the generator output terminal and splices to fuse F8 and fuse F16 in the [1][2]Power Distribution Center (PDC). Circuit A0 connects the battery to the PDC.

Circuit Z0 provides ground for the generator. Circuit Z0 attaches to the rear of the right side of the engine, and is spliced to the battery negative terminal.

Power for the field terminal of the generator is supplied by circuit A61. The A61 circuit is connected to the contact side of the Automatic Shut Down (ASD) relay.

Power for the contact side of the relay is supplied by circuit A5. This circuit is protected by a 20 amp fuse located in cavity 2 of the PDC.

When the PCM grounds the ASD relay, contacts inside the relay close and connect circuit A5 from fuse 2 in the PDC to circuit A61. Circuit A61 splices to the generator field terminal.

The PCM has an internal voltage regulator that controls generator output. The PCM controls the generator field on circuit K2O. Circuit K2O connects to PCM cavity 20.

When the engine operates and there is current in the generator field, the generator produces a B+ voltage. The generator supplies B+ voltage to the battery through the A11and A0 circuits.