Automatic Level Control (ALC) Compressor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12129565 4-Way F Metri-Pack 280 Series, Sealed (GY)
Pin	Wire Color	Circuit No.	Function
A	WH	320	Automatic Level Control Exhaust Solenoid Control
B	D-GN	322	Automatic Level Control Compressor Motor Supply Voltage
C	RD/WH	1340	Battery Positive Voltage
D	BK	450	Ground