Headlamps Inoperative - Left Low Beam. 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 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps Inoperative - Left Low Beam

Step	Action	Value(s)	Yes	No
1	Set the headlamp switch to the HEAD position. Set the headlamp dimmer switch to the LO position. Use a fused jumper from terminal A to chassis ground in order to backprobe the left headlamp. Does the headlamp light?	--	Go to Step 2	Go to Step 3
2	Repair the open in CKT 150 (BLK) between the left headlamp and S105. Is the repair complete?	--	System OK	--
3	Connect a test lamp between terminal C in the left headlamp harness connector and chassis ground. Does the test lamp light?	--	Go to Step 4	Go to Step 5
4	Replace the left headlamp. Refer to Headlamp Replacement . Is the repair complete?	--	System OK	--
5	Repair the open in CKT 12 (TAN) between terminal C in the right headlamp harness connector and terminal C in the left headlamp harness connector. Is the repair complete?	--	System OK	--