Air Dryer/Moisture Ejector System Check. GMC Truck GMC C-Series Medium Duty Truck B7 1998

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Air Dryer/Moisture Ejector System Check

Step	Action	Value(s)	Yes	No
1	Turn the ignition switch to RUN Backprobe the air dryer with a test lamp from terminal A to the chassis ground. Did the test lamp light?	--	Go to Step 2	Go to Step 3
2	Repair the open in CKT 150 (BLK) between the S409 and G405. Do both the air dryer and the moisture ejector heater operate?	--	System OK	--
3	Repair the open in CKT 341 (BRN) between the IP fuse block and S408. Do both the air dryer and the moisture ejector heater operate?	--	System OK	--

Step

Action

Value(s)

Yes

Did the test lamp light?

Repair the open in CKT 150 (BLK) between the S409 and G405.

Do both the air dryer and the moisture ejector heater operate?

System OK

Repair the open in CKT 341 (BRN) between the IP fuse block and S408.

Do both the air dryer and the moisture ejector heater operate?

System OK