TM 5-3805-262-20
3-32. CHARGING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ALTERNATOR NOT CHARGING BATTERIES (Cont).
Step 8.
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.
Turn ignition key switch to accessory position (first counterclock-
w i s e p o s i t i o n ) .
Put vehicle lights switch auxiliary switch in OFF position
switch in following positions. Record VTM display for each
p o s i t i o n .
MAIN SWITCH
CURRENT READING
POSITION
(VTM DISPLAY)
B.0. MARKER
(TBD)
B.0. DRIVE
(TBD)
STOP LIGHT
(TBD)
(depress brake treadle
and main
switch
valve )
SER DRIVE (flood lights
SER DRIVE (flood lights
on)
VTM display should indicate current
o f f)
(TBD)
(TBD)
reading indicated above for each
position of vehicle lights switch main switch.
Turn ignition key switch to off position.
a. If current readings are okay, go to step 9 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 9.
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.
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