CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
B.O. SERVICE CONDITION (IR HEADLIGHTS-Continued
WARNING
Remove all jewelry such as rings, dog
tags, bracelets, etc. If jewelry contacts a
metal surface a direct short may result in
instant heating of tools, damage to
equipment, and injury or death to
personnel.
J
Reconnect headlight and dimmer switch wiring
harness to dimmer switch. Remove three screws (6),
three lockwashers (7), ground lead (8), and flat
washer (9) and release main switch panel (10) from
mounting brackets. Disconnect switch panel to gage
panel and miscellaneous switches wiring harness
from main switch panel. Place red lead of
multimeter on pin N of wire 10 and black lead to
ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, go to step K. If voltage is not present, go to
step S.
K
Place a jumper wire from pin N to socket N of wire
10. Place red lead of multimeter in socket A of wire
514/515 and black lead to ground. Turn MASTER
switch on, UNLOCK and move main lighting switch
to B.O. DRIVE position, B.O. SELECTOR switch to
IR, and check for voltage. Turn MASTER main
lighting, and B.O. SELECTOR switches off. If
voltage is present, go to step L. If voltage is not
present, go to step M
2—
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