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 265 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
42.
ONE HEADLAMP NOT WORKING (Continued).
6.
Check for voltage at
12-volts dc
Replace
Repair circuit
circuit 16-GN terminal
nominal.
headlamp
16-GN (para
of headlamp connector.
(para 3-91).
3-127).
43.
BOTH HEADLAMPS NOT WORKING IN EITHER HIGH OR LOW BEAM POSITION.
NOTE
Headlamp switch must be set to ON position
when
doing
the
following checks.
1.
Set blackout toggle
Blackout
Go to step 4.
Go to step 2.
switch to BLACKOUT
headlamp
position.
lights.
2.
Check for voltage at
12 volts dc
Go to step 3.
Refer to mal-
circuit 26-GY terminal
nominal.
function 44.
of headlamp switch.
3.
Check for voltage at
12-volts dc
Go to step 4.
Repair circuit
circuit 26-GY terminal
nominal.
26-GY (para
of blackout toggle
3-127).
switch.
4.
Set blackout toggle
12-volts dc
Go to step 5.
Replace black-
switch to NORMAL
nominal.
out toggle
position.
Check for
switch (para
voltage at circuit
3-79).
26A-DB terminal of
blackout toggle switch.
5.
Check for voltage at
12-volts dc
Replace dim-
Repair circuit
circuit 26B-DB terminal
nominal.
mer switch
26B-DB (para
of dimmer switch.
(para 3-82).
3-127).
2-140
Back to Top
