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 229 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).
12.
Remove circuits 38-LG,
12-volts dc
Go to step 13.
Replace circuit
50-LG, and 31-LG from
nominal.
breaker CB-3
circuit breaker CB-3,
(para 3-114).
and reset breaker.
Check for voltage at
circuit breaker
terminal.
13.
Reconnect circuit
12-volts dc
Circuit breaker
If circuit
38-LG, 50-LG, and
nominal.
CB-2 is OK. Go
breaker trips,
51-LG to circuit
to step 14.
circuit 38-LG,
breaker CB-3. Check
50-LG, or 51-LG
for voltage at ter-
is shorted to
minal.
ground. Refer
to wiring
diagram (Appen-
dix D, figure
FO-9) and mal-
function of
faulty system.
Install circuit
breaker bracket
(para 3-114).
14.
Check for voltage at
12-volts dc
Go to step 15.
Clean and
bus bar terminal of
nominal.
tighten bus bar
circuit breaker CB-4.
connections at
circuit breaker
ers CB-2, CB-3,
and CB-4. In-
stall circuit
breaker bracket
(para 3-114).
2-104
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