TEST OR INSPECTION
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 third and fourth warning lights
on passenger side of cab roof lightbar (WP 0345). Check for continuity across cab roof
lightbar cable assembly from cab roof lightbar flasher unit, terminals 10 and 11.
If there is continuity, replace roof lightbar flasher unit (WP 0403).
If there is no continuity, repair wire 1640 between roof lightbar flasher
unit, terminals 10 and 11 if repairable (TM 9-2320-325-14&P), or
replace cab roof lightbar cable assembly (WP 0371).
Check if there is more than one non-operating cab roof lightbar warning light on front
cab roof lightbar.
If there is more than one non-operating cab roof lightbar warning light, go to