TM 5-1940-277-34ALTERNATOR REPAIR INSTRUCTIONS(Continued)LOCATIONITEMACTIONREMARKSd.Increase drivespeed to 3000RPM.e.Turn batteryselector to24V.CAUTIONDo not exceed 28 vdc on the DC voltmeter. Damage to alternator rectifiers will result.f.While watchingDC voltmeterslowly turnfield currentrheostat clock-wise until28 volts areobtained.CAUTIONAs test stand batteries are charged, reading on DC voltmeter will rise. Field current rheostat mustbe turned slightly counterclockwise to maintain 28 volts until battery charging rate has stabilized.g.Turn onmaster loadswitch.h.Turn on 50Aand 0-25A loadswitches.2-89
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