TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
9.
LHS ENGAGED INDICATOR LIGHT DOES NOT OPERATE (MODEL A ONLY).
INITIAL SETUP
Tools and Special Tools
Equipment Condition
Heater, Gun-Type (500A)
Engine turned off (TM 9-2320-279-10)
Multimeter (ANURM105C)
Parking brake applied (TM 9-2320-279-10)
Tool Kit, General Mechanic's: Automotive
Wheels chocked (TM 9-2320-279-10)
(SC 5180-90-N26)
START
1.
KNOWN INFO
TEST OPTIONS
None.
Visual inspection.
Is circuit breaker
CB 15 OK (not
REASON FOR QUESTION
tripped)?
POSSIBLE PROBLEMS
The main power supply
CB 15 tripped.
for the LHS electrical
L.H.S. ENGAGED
system is from CB15. If
indicator bulb faulty.
this breaker is tripped,
Cab control box faulty.
the LHS indicator light,
Supply harness faulty.
as well as the rest of the
Cab control box wiring
LHS system, will not
faulty.
function.
LHS MODE SELECT
switch faulty.
Reset circuit
NO
breaker.
YES
Change 1
