TM 5-3805-262-20
3-32. CHARGING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ALTERNATOR NOT CHARGING BATTERIES (Cont).
S t e p 9 . ( C o n t ).
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).
VTM display should indicate (TBD) amperes.
Turn ignition key switch to off position.
a. If VTM displays (TBD) amperes, go to step 10 below.
b. If VTM displays over (TBD) amperes, a short circuit exists.
Short circuit may be in hydraulic filter switches or height and
return to dig control circuits. Refer to wiring diagram, pages
FO-7 and FO-9 to locate component or wire drawing too much cur-
r e n t .
Step 10. 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 .
Check that fuel SHUT OFF control is pulled out preventing engine
f r o m s t a r t i n g.
Turn ignition key switch to extreme clockwise position and crank
engine for 10 seconds then release ignition key switch. Don’t turn
ignition key switch to off position. You should hear a high pitched
sound indicating auxiliary steering motor and pump is operating.
VTM display should indicate (TBD) amperes.
Turn ignition key switch to off position,
a. If VTM displays (TBD) amperes, go to step 11 below.
b. If VTM displays over (TBD) amperes, a short circuit exists in
auxiliary steering motor and pump circuit. Refer to schematic
diagram and wiring diagram (pages FO-3 through FO-9) to locate
component or wire drawing too much current.
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