TM 5-3805-262-20
3-32. CHARGING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ALTERNATOR NOT CHARGING BATTERIES (Cont).
Step 11. Dial 90 into VTM TEST SELECT.
Press and hold TEST button until CAL appears on VTM display then
release TEST button.
Wait for offset value to appear on display. Offset value should be
between -225 to +225. If it is not, STE/ICE is defective (refer to
TM 9-4910-571-12&P).
Press and release TEST button.
Put vehicle lights switch main switch and auxiliary switch in OFF
3-264
p o s i t i o n s .
Turn ignition key switch to on position (first clockwise position.
At console/cab switch panel, turn on switches listed below, record
VTM display, then return switch to its off position.
SWITCH/POSITION
CURRENT READING
( VTM DISPLAY )
DEFROSTER/ON
(TBD)
HEATER/LOW
(TBD)
HEATER/HIGH
(TBD)
FRONT WIPER/HIGH
(TBD)
FRONT WIPER/LOW
(TBD )
VTM display should indicate current readings specified above.
Turn ignition key switch to off position.
a. If current readings are okay, go to step 12 below.
b. If current readings are higher, refer to wiring diagram, pages
FO-7 and FO-9, and locate component or wire in circuit drawing
too much current.
Step 12. Dial 90 into VTM TEST SELECT.
Press and hold TEST button until CAL appears on VTM display then
release TEST button.
Wait for offset value to appear on display. Offset value should be
between -225 to +225. If it is not, STE/ICE is defective (refer to
TM 9-4910-571-12&P).
Press and release TEST button.
Put vehicle lights switch main switch and auxiliary switch in OFF
p o s i t i o n s.
Turn ignition key switch to on position (first clockwise position).
