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 237 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).
6.
Reconnect circuits
12-volts dc
Circuit breaker
If circuit
59-OR, 25-OR, and
nominal.
CB-1 is OK. Go
breaker trips,
15D-OR to circuit
to step 7.
circuit 59-OR,
breaker CB-1. Check
25-OR, or
for voltage at
15D-OR is
terminal.
shorted to
ground. Refer
to wiring dia-
gram (Appendix
D, figure FO-8)
and malfunction
of faulty sys-
tem. Install
circuit breaker
bracket (para
3-114).
7.
Check for voltage at
12-volts dc
Go to step 8.
Repair circuits
circuit 10F-RD
nominal.
10-RD and/or
terminal of ignition
10F-RD (para
relay RY-9.
3-127). Install
circuit breaker
bracket (para
3-114).
2-112
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