Starting and Charging: Description and Operation

STARTING AND CHARGING

CIRCUIT OPERATION

Starting System
When the Ignition Switch (X274) is switched to position III, the BeCM (Z238) grounds the starter solenoid relay inside the Engine Compartment Fuse Box (P125) which then energizes, applying battery voltage to the Starter Solenoid (K136) and Starter (M134).

Charging System
When the Ignition Switch (X274) is in position II, the BeCM (Z238) turns the charge warning light on via the datalink connection to the Instrument Pack (Z142)

When the Generator (Z106) starts to produce power, the BeCM (Z238) gets an input signal on Pin 15 and turns off the charge warning light.

For the Diesel engine this signal is also used as an input signal for the fuel pump relay inside the Engine Compartment Fusebox (P125) to make sure that the Fuel Pump (M109) is only supplied with power when the engine is running.

If the Generator (Z106) fails to produce power, the charge warning light remains illuminated.