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 406 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11. TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
87.
MAP LAMPS LIGHT, BUT ARE DIM.
NOTE
•
Blackout toggle switch must be set to NORMAL position and map
lamp switch set to ON position when doing the following checks.
•
With positive lead at known hot circuit, check ground with negative
lead when doing the following checks.
1.
Check for voltage at
12-volts dc
Go to step 2.
Clean and
circuit 98F-BK ground
nominal.
tighten ground
point of instrument
point connec-
panel.
tion.
2.
Check for voltage at
12-volts dc
Go to step 3.
Repair circuit
circuit 98F-BK terminal
nominal.
98F-BK (para
of start switch.
3-127).
3.
Check for voltage at
12-volts dc
Go to step 4.
Repair circuit
circuit 99E-BK terminal
nominal.
99E-BK (para
of voltmeter.
3-127).
4.
Disconnect circuit
98B-BK from 99A-BK at
connector, and go to
step 5.
5.
Check for voltage at
12-volts dc
Connect circuit
Repair circuit
circuit 98B-BK terminal
nominal.
98B-BK to
98B-BK (para
of connector.
99A-BK, and go
3-127).
to step 6.
6.
Remove passenger’s map
lamp (para 3-99).
2-280
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