TM 9-2320-289-34
4-2.
ALTERNATOR TESTING AND REPAIR (ALL EXCEPT M1010) (Con’t).
3.
4.
5.
6.
7.
Connect voltmeter (44) and fast
charger (43) to a 12 volt battery.
Connect voltage regulator (12) and
test lamp (46) as shown.
Observe battery (45) polarity. Test
lamp (46) should be on.
Turn on fast charger (43) and slowly
increase
charge
rate.
Observe
voltmeter (44), Test lamp (46) should
go out at voltage regulator (12)
setting.
Voltage regulator setting
should be a minimum of 13,5 volts
and a maximum of 15,5 volts,
Remove
test
lamp
(46),
and
disconnect voltmeter (44) and fast
charger (43).
8.
Using self-powered test light or ohmmeter, check for continuity between slip rings. If continuity is
not present, replace rotor.
9.
Using self-powered test light or ohmmeter, check for continuity between each slip ring and rotor
shaft. If there is continuity, replace rotor.
10.
Check for rotor short circuits or extreme resistance by connecting a battery and ammeter in
series with edges of 2 slip rings. Ammeter reading at 70°F (21°C) should be 4.5-5.0 amps, If
ammeter reading is not with specification, replace rotor.
TA50780
4 - 8
Change 2
