TEST OR INSPECTION
Check if non-operating warning light is located on front cab roof lightbar.
If non-operating warning light is located on passenger side or driver side
lightbar, go to Step 24.
Put EMERG MASTER and ROOF EMERGENCY LIGHTS switches to off
position (WP 0004). Turn Service Drive Lights Off (TM 9-2320-347-10). Turn battery
disconnect switch to OFF position (WP 0007). Remove non-operating warning light
from cab roof lightbar (WP 0345). With a test lead set, check for continuity across cab
roof lightbar cable assembly ground wire (white) from non-operating cab roof warning
light connector, terminal 1, to a known good ground.
If there is no continuity, repair ground wire in cab roof lightbar cable
assembly if repairable (TM 9-2320-325-14&P), or replace cab roof lightbar
cable assembly (WP 0371).