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 231 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
33.
NO POWER AT 12-VOLT CIRCUIT BREAKERS CB-2, CB-3, AND/OR CB-4 (Continued).
15.
Check for voltage at
12-volts dc
Circuit breaker
Go to step
circuit 75-DB terminal
nominal.
CB-4 is OK. Go
16.
of circuit breaker
to step 18.
CB-4.
16.
Remove circuit 76-DB
12-volts dc
Go to step
Replace circuit
from circuit breaker
nominal.
17.
breaker CB-4
CB-4, and reset
(para 3-114).
breaker. Check for
voltage at circuit
breaker terminal.
17.
Reconnect circuit
12-volts dc
Circuit breaker
If circuit
76-DB to circuit
nominal.
CB-4 is OK, Go
breaker trips,
breaker CB-4. Check
to step 18.
circuit 76-DB
for voltage at ter-
is shorted to
minal.
ground. Refer
to wiring
diagram (Appen-
dix D, figure
FO-9) and mal-
function of
inoperative
system. Install
circuit breaker
bracket (para
3-114).
18.
Check for voltage at
12-volts dc
Go to step
Clean and
bus bar terminal of
nominal.
19.
tighten bus bar
circuit breaker CB-2.
connections at
circuit breaker
ers CB-2, CB-3,
and CB-4.
2-106
Back to Top
