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 247 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
35.
NO POWER AT 24-VOLT CIRCUIT BREAKERS CB-8 AND/OR CB-9 (Continued).
8.
Check for voltage at
24-volts dc
Go to step 9.
Clean and
bus bar terminal of
nominal.
tighten bus bar
circuit breaker CB-9.
connections at
circuit breakers
CB-8 and CB-9.
Install circuit
breaker bracket
(para 3-114).
9.
Check for voltage at
24-volts dc
Circuit breaker
Go to step 10.
circuit 18B-GY termi-
nominal.
CB-9 is OK.
nal of circuit breaker
CB-9.
10.
Remove circuit 18B-GY
24-volts dc
Go to step 11.
Replace circuit
from circuit breaker
nominal.
breaker CB-9
CB-9, and reset
(para 3-114).
breaker.
Check for
voltage at circuit
breaker terminal.
11.
Reconnect circuit
24-volts dc
Circuit breaker
If circuit
18B-GY to circuit
nominal.
CB-9 is OK.
breaker trips,
breaker CB-9.
Check
circuit 18B-GY
for voltage at ter-
is shorted to
minal.
ground.
Refer
to wiring dia-
gram (Appendix
D, figure FO-8)
and malfunction
of faulty
system.
Install
circuit breaker
bracket (para
3-114).
2-122
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