IMPROPER OUTPUT CURRENT

TM 10-3930-638-24&P

3-9. ALTERNATOR TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. IMPROPER OUTPUT CURRENT

Connect test set-up to alternator as illustrated.

Step 1.

Operate alternator at moderate speed and adjust carbon

pile for maximum indication on ammeter.

Note ammeter indication.

a. If ammeter indicates 27 to 47 amperes, and volt-

meter indicates less than 31 Vdc, alternator

operation is normal.

b. If ammeter does not indicate 27 to 47 amperes,

proceed to step 2.

Step 2.

CAUTION

Tab is within 3/4 inch of casting surface. Do not

force screwdriver deeper than one inch into alter-

nator end frame.

Insert screwdriver into test hole in end frame and

ground tab as shown; then repeat step 1.

a. If ammeter indicates 27 to 47 amperes, check

field winding and regulator (para 3-12).

b. If ammeter does not indicate 27 to 47 amperes,

check the alternator field winding, diode trio,

rectifier bridge and stator (para 3-12).

3-10. STARTER AND SOLENOID TROUBLESHOOTING

1. STARTER TROUBLESHOOTING

NOTE

Compare results of starter no-load test (STARTER CRANKS TOO

SLOWLY, para 2-21) with the following chart and then refer to