Boeing 737 NG Systems Review
Forward Overhead Panel  700/800/900
Display Selector
Generator Drive and Standby Power Panel
Left Drive Light
Right Drive Light
STBY Power Off Light
Left Generator Drive Disconnect Switch
Right Generator Drive Disconnect Switch
Generator Drive Disconnect (DISCONNECT) Switches

Disconnects the IDG if electrical power is available and engine
start lever is in IDLE.

NOTE: IDG cannot be reconnected in the air.