Component Tests and General Diagnostics: Diagnosis and Testing

Refer to PDU User Guide
Refer to the PDU User Manual for detailed instructions on testing the charging circuit.

When diagnosing the charging circuit, the PDU indicates only whether the generator is charging or not charging. The reason for this is that the PDU cannot handle the potential full charging current and that the voltage control circuits are located within the generator assembly, making them inaccessible by the PDU directly.

It is possible that the battery has failed. In this case, the voltage output at the generator could be correct, but the voltage at the battery terminals, and therefore the rest of the vehicle system, will be adversely affected by the faulty battery.

The same result is given by the PDU if the battery is faulty (generator not faulty), wiring fault (damaged or severe corrosion at the terminals) or if the generator is at fault.