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 225 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.
1.
Check for voltage to
circuit breakers CB-8
and CB-9. (Refer to
malfunction 35). Leave
circuit breaker bracket
removed for access in
later steps.
2.
Check for voltage at
24-volts dc
Go to step 3.
Repair circuit
circuit 18F-YL terminal
nominal.
18F-YL (para
of ignition switch.
3-127).
NOTE
Ignition switch must be in ON position when doing the following check.
3.
Check for voltage at
24-volts dc
Go to step 4.
Replace switch
circuit 12B-DB terminal
nominal.
(para 3-74).
of ignition switch.
Install circuit
(para 3-114).
4.
Check for voltage at
24-volts dc
Go to step 5.
Repair circuit
circuit 12B-DB terminal
nominal.
12B-DB (para
of relay RY-9.
3-127). Install
bracket (para
3-114).
NOTE
With positive lead on circuit 12B-DG, check ground with negative lead when doing the
following checks.
2-100
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