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 243 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).
16.
Check for voltage
12-volts dc
Go to step 17.
Clean and
at bus bar terminal
nominal.
tighten bus bar
of circuit breaker
connections at
CB-7.
circuit break-
ers CB-5, CB-6,
and CB-7.
Install circuit
breaker bracket
(para 3-114).
17.
Check for voltage
12-volts dc
Circuit breaker
Go to step 18.
at circuit 30S-DG
nominal.
CB-7 is OK.
terminal of cir-
cuit breaker CB-7.
18.
Remove circuit
12-volts dc
Go to step 19.
Replace circuit
30S-DG from circuit
nominal.
breaker CB-7
breaker CB-7, and
(para 3-114).
reset breaker.
Check
for voltage at circuit
breaker terminal.
19.
Reconnect circuit
12-volts dc
Circuit breaker
If circuit
30S-DG to circuit
nominal.
CB-7 is OK.
breaker trips,
breaker CB-7.
Check
circuit 30S-DG
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).
2-118
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