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 241 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).
12.
Check for voltage at
12-volts dc
Go to step 13.
Clean and
bus bar terminal of
nominal.
tighten bus bar
circuit breaker CB-5.
connections at
circuit breakers CB-5, CB-
6, and CB-7. Install circuit
breaker bracket (para 3-
114).
13.
Check for voltage at
12-volts dc
Circuit breaker
Go to step 14.
circuit 35-LG terminal
nominal.
CB-5 is OK.
Go
of circuit breaker
to step 16.
CB-5.
14.
Remove circuits 35-LG
12-volts dc
Go to step 15.
Replace circuit
and 42-LG from circuit
nominal.
breaker CB-5
breaker CB-5, and
(para 3-114).
reset breaker.
Check
for voltage at circuit
breaker terminal.
15.
Reconnect circuits
12-volts dc
Circuit breaker
If circuit
35-LG and 42-LG to
nominal.
CB-5 is OK.
Go
breaker trips,
circuit breaker CB-5.
to step 16.
circuit 35-LG
Check for voltage at
or 42-LG is
terminal.
shorted to
ground.
Refer
to wiring dia-
gram (Appendix
D, figure FO-8)
and malfunction
of faulty
system.
Install
circuit breaker
bracket (para
3-114).
2-116
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