Alternator Testing

TM 9-2320-279-20-1

Electrical System Maintenance Instructions (Cont)

7-2 ALTERNATOR TESTING (CONT).

Alternator Testing.

(1)

Connect voltmeter to negative terminal (1) and positive terminal (2). Meter should be between

26 and 28 volts at 1200 to 1500 rpm.

NOTE

If truck is equipped with 65 or 100 amp alternator, perform step (2).

If truck is equipped with 130 amp alternator, perform step (3).

(2)

If output is not between 26 and 28 volts, adjust regulator (3) (para 7-6).

(3)

If output is not between 26 and 28 volts, adjust regulator (3) (para 7-6.1).

NOTE

Perform step (4) for Model A voltage regulator. Replacement of Model B voltage regulator is

done at Direct Support. Model A voltage regulator is used on 65 and 100 amp alternators.

Model B voltage regulator is used on 130 amp alternator.

(4)

If output is still not between 26 and 28 volts, replace regulator (3) (para 7-5).

(5)

If output is still under 26 volts, replace alternator (para 7-3).

Follow-on Maintenance.

(1)

Shut off engine (TM 9-2320-279-10).

(2)

Install engine side panel (TM 9-2320-279-10).

(3)

Close engine cover (TM 9-2320-279-10).

END OF TASK

7-4

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