Charging System Diagnostics Using The ATech #812c Board [Quick Quiz]

Two technicians are discussing GM’s strategy of including the BCM in the charging system. Technician A says that the BCM controls the voltage output of the alternator. Technician B says that the BCM interacts with the charging system to detect “load dump” when there is a sudden high demand for current. Which tech is correct?*

Technician A Only
Technician B Only
Technician B Only
Neither Technicians A or B

The two wire voltage regulator connectors on later model GM alternators use a:*

“L” terminal to control field operation and “F” terminal to monitor the field
“P” terminal to control stator “Phase” and “S” terminal to monitor the stator
CAN high speed 2-wire communications network
Power to one brush and ground to the other brush

Late model GM charging system schematics may use the exact same alternator terminal labels and circuit descriptions for their newer models as they did for older models even though the circuits work entirely different.*

True
False

The output terminal on an alternator is internally connected to the:*

Positive brush
Voltage regulator’s output
Negative brush
Rectifier bridge

On many late model GM charging systems, the generator “L” terminal (as shown in the wiring diagram) stands for “Lamp” even though the charge lamp in the IPC may have no role in getting the charging system to operate.*

True
False

Charging System Diagnostics Using The ATech #812c Board [Quick Quiz]

December 9, 2020

LBT-399 Charging System Diagnostics Using The ATech #812c Board