RAM 2500 Van V8-5.9L VIN Z (1997)
Alternator Lamp/Indicator: Description and Operation
SYSTEM OPERATION
The generator warning lamp gives an indication of a charging system problem. One side of the bulb is connected to an ignition-switched battery
feed. The other side of the bulb is switched to ground by the Powertrain Control Module (PCM).
The lamp should light when the ignition switch is turned to the On position, but should go out whenever the engine is running. If the lamp comes
on and stays on while the engine is running, it indicates that the PCM has detected a charging system malfunction and/or that the charging system
has become inoperative.
Refer to Starting and Charging/Charging System for diagnosis of a charging system problem. Refer to Powertrain Management/Computers and
Control Systems for more information on the PCM generator warning lamp control output.
