TM 5-3805-262-20
3-8. CHARGING SYSTEM TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ALTERNATOR NOISY.
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. If belt tension is okay, replace alternator (page 5-10) and for-
ward noisy alternator to next higher maintenance level for re-
p a i r .
2. ALTERNATOR NOT CHARGING BATTERIES.
B a t t e r y e l e c t r o l y t e i s t o x i c a n d c o r r o s i v e . U s e p r o t e c t i v e g o g g l e s a nd
g l o v e s w h e n p e r f o r m i n g t h e f o l l o w i n g.
Avoid contact with skin, eyes,
clothes, and don’t breathe vapors.
Step 1.
Check battery specific gravity (page 5-144).
a . I f c o r r e c t e d s p e c i f i c g r a v i t y o f e a c h b a t t e r y c e l l i s a t l e a st
1.225, go to step 2 below.
b . I f c o r r e c t e d s p e c i f i c g r a v i t y o f a n y b a t t e r y c e l l i s l e s s t h an
1.225, charge battery using external charger (page 5-146). Then
go to step 2 below.
Step 2.
Remove engine side panels (page 9-14).
Connect multimeter between alternator BAT terminal and chassis
frame.
Multimeter should indicate 24 volts.
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