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 239 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
34.
NO POWER AT 12-VOLT CIRCUIT BREAKERS CB-1, CB-5, CB-6, AND/OR CB-7 (Continued).
8.
Check for voltage at
12-volts dc Go to step 9.
Repair circuit
circuit 100G-RD ter-
nominal.
10G-RD (para
minal of circuit
3-127). Install
breaker CB-6.
circuit breaker
panel (para
3-114).
9.
Check for voltage at
12-volts dc
Circuit breaker
Go to step 10.
circuit 40-PP terminal
nominal.
CB-6 is OK. Go
of circuit breaker
to step 12.
CB-6.
10.
Remove circuits 40-PP
12-volts dc Go to step 11.
Replace circuit
and 21-PP from circuit
nominal.
breaker CB-6
breaker CB-6 and,
(para 3-114).
reset breaker. Check
for voltage at circuit
breaker terminal.
11.
Reconnect circuits
12-volts dc
Circuit breaker
If breaker
40-PP and 21-PP to
nominal.
CB-6 is OK. Go
trips, circuit
circuit breaker CB-6.
to step 12.
40-PP or 21-PP
Check for voltage at
is shorted to
terminal.
ground. Refer
to wiring dia-
gram (Appendix
D, figure FO-8)
and malfunction
of faulty
system. Install
circuit breaker
bracket (para
3-114).
2-114
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