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TM 10-4320-324-14
5-7
Alternator Assembly Testing (CONT).
a.
Testing.
(1) Regulator test (open).
NOTE
Alternator should be mounted in vise, shaft rotating at 3000 RPM, with jumper wire installed between B
and the field terminal.
(a) Measure voltage at terminal A. Meter should read approximately 14 volts.
(b) Increase RPM to 4000. (Clockwise as viewed facing the fan.)
(c)
Measure voltage at terminal A. Voltage should increase to 15 to 16 volts.
(d)
Readings other than these indicate the alternator is open and should be replaced.
5-8
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