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 207 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
28.
LOW AIR PRESSURE INDICATOR AND/OR BUZZER NOT WORKING (Continued).
7
Check for voltage at
12-volts dc
Replace buzzer
Repair circuit
circuit 99E-BK
nominal
(para 3-110),
99E-BK (para
terminal of buzzer
and go to step
3-127).
8.
NOTE
With negative lead connected to a good ground, use positive lead to check for voltage.
8
Check for voltage at
12-volts dc
Go to step 9
Repair circuit
circuit 53-DB ter-
nominal
53-DB (para
minal of low air
3-127).
pressure indicator
lamp socket.
NOTE
With positive lead on circuit 53-DB, check for ground with negative lead.
9
Check for voltage at
12-volts dc
Go to step 10
Clean and/or
circuit 53C-BK ground
nominal
tighten ground
point of air pressure
point connec-
gage
tion.
10
Check for voltage at
12-volts dc
Replace bulb
Repair circuit
circuit 53C-BK ter-
nominal
(para 3-84)
53C-BK (para
minal of low air
3-127).
pressure indicator
lamp socket.
2-82
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