TM 10-4320-307-24
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ALTERNATOR TEST/REPLACE (CONT ).
8.
Connect multimeter (7) across alternator AC terminals (8) and (9), (8) and (10), and (9) and (10) and compare each
of the three AC voltage readings.
NOTE
If DC voltage is higher in step 7 than in step 2 and AC voltages are balanced -
Alternator OK, Stator OK. (See Adjustment task b.)
If DC voltage is higher in step 7 than in step 2 and AC voltages are not balanced -
Alternator is malfunctioning. Stator or rectifier(s) is defective. Remove alternator and notify
direct support maintenance.
If DC voltage is lower or the same in step 7 as in step 2 and AC voltages are
balanced Alternator is malfunctioning. Remove alternator and notify direct support
maintenance.
If DC voltage is lower or the same in step 7 as in step 2 and AC voltages are not
balanced - Alternator is malfunctioning. Stator or rectifier(s) is defective. Remove
alternator and notify direct support maintenance.
These statements are true only if the batteries are 95 to 100% charged.
NOTE
Stator is OK if all three AC voltages are approximately the same (balanced).
9.
Remove jumper from output terminal.
10. Remove drill bit from brush holder.
11. Install O-ring and cover plate using four screws.
NOTE
If voltages observed are not within ranges stated, remove alternator and notify direct support.
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