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 3 . ( C o n t ).
Install current probe around battery positive cable with arrow on
current probe pointing towards battery.
Dial 90 into TEST SELECT.
Press and hold TEST button until CAL appears on VTM display then re-
lease 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).
Dial 01 into TEST SELECT and press and release TEST button.
When PASS appears on display, dial 03 into TEST SELECT and press and
release TEST button.
When pass appears, dial 90 into TEST SELECT and press and release
TEST button.
VTM will alternately display maximum charging current and engine
rpm.
Depress accelerator to obtain 1700 to 1900 rpm.
Turn all loader driving lamps, flood lights, and accessories on to
load charging system.
VTM display should indicate 65 amperes.
Turn off loader driving lamps, flood lights, accessories, and en-
g i n e .
a. If VTM displays over 65 amperes, a circuit or battery is drawing
too much current. Go to step 5 below.
b. If VTM displays less than 65 amperes, go to step 4 below.
c. If VTM displays 65 amperes, charging system is okay.
Step 4. Check alternator drive belts tension (page 5-2).
a. Adjust drive belts tension as necessary (page 5-5). Replace worn
or damaged belts as a matched set (page 5-4).
b . I f b e l t t e n s i o n i s o k a y , r e p l a c e a l t e r n a t o r ( p a g e 5 - 1 0 ) .
Step 5.
Check batteries (page 3-286, battery system troubleshooting, MAL-
FUNCTION 2).
a .
b .
Replace or charge batteries as indicated in battery system
t r o u b l e s h o o t i n g .
If batteries are okay, go to step 6 below.
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