TM  10-3930-638-24&P 3-9.    ALTERNATOR    TROUBLESHOOTING    (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 2. IMPROPER OUTPUT CURRENT Step  1. Connect test set-up to alternator as illustrated. 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 paragraph 3-13: 3-90