TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 233 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
33.
NO POWER AT 12-VOLT CIRCUIT BREAKERS CB-2, CB-3, AND/OR CB-4 (Continued).
19.
Check for voltage at
12-volts dc
Circuit breaker
Go to step 20.
circuit 52-LB terminal
nominal.
CB-2 is OK.
of circuit breaker
CB-2.
20.
Remove circuit 52-LB,
12-volts dc Go to step 21.
Replace circuit
89-DB, 44E-LB, and
nominal.
breaker CB-2
44-LB from circuit
(para 3-114).
breaker CB-2, and
reset breaker. Check
for voltage at circuit
breaker terminal.
21.
Reconnect circuits
12-volts dc
Circuit breaker
If circuit
52-LB, 89-DB, 44E-LB,
nominal.
CB-2 is OK.
breaker trips,
and 44-LB. Check for
circuit 52-DB,
voltage at terminal.
89-DB, 44D-LB,
or 44-LB is
shorted to
ground. Refer
to wiring
diagram (Appen-
dix D, figure
FO-9) and mal-
function of
inoperative
system. Install
circuit breaker
bracket (para
3-114).
2-108
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