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 209 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
29.
DIFFERENTIAL LOCK LAMP NOT WORKING.
1
Remove circuit breaker
bracket far enough to
access circuit breaker
CB-2 (para 3-114), and
go to step 2.
NOTE
Ignition switch must be in ON position and battery power connected when doing the following checks.
2
Check for voltage at
12-volts dc
Install cir-
Reset circuit
circuit 44E-LB ter-
nominal
cult breaker
breaker CB-2
minal of circuit
bracket (para
and/or trouble-
breaker CB-2
3-114), and go
shoot CB-2
to step 2
circuit (Refer
to malfunction
33).
3
Check for voltage at
12-volts dc
Go to step 4
Repair circuit
circuit 44E-LB ter-
nominal
44E-LB (para
minal of low air
3-127).
pressure switch.
4
Check for voltage at
12-volts dc
Go to step 5
Repair circuit
circuit 44F-LB ter-
nominal
44F-LB (para
minal of park brake
3-127).
pressure switch.
5
Check for voltage at
12-volts dc
Go to step 6
Repair circuit
circuit 44G-LB ter-
nominal
44G-LB (para
minal of differental
3-127).
lock pressure switch.
NOTE
.Lock pressure switch must be in LOCK position
when
doing
the
following checks.
.With negative lead connected to a good ground, use positive lead to check for voltage.
2-84
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