TM 9-2320-280-20-1 ALTERNATOR 2-224.6           Change 1 DIAGNOSTIC FLOWCHART G FROM B1, Page 2-204 REPLACE REGULATOR (Para 4-5.10). THEN GO TO 5, Page 2-198 KNOWN INFO POSSIBLE PROBLEMS WIRING ALTERNATOR REGULATOR VOLTAGE OUTPUT   INCORRECT TEST OPTIONS REASON FOR QUESTION STE/ICE-R TEST 10, (interleave with control function 01 of page 2-734 then 89, page 2-750) Determine if high or low output voltage. G2 START ENGINE AND ALLOW  TO IDLE AT 1200-1500 RPM FOR 2-3 MINUTES. RECHECK VOLTAGE OUTPUT. IS ALTERNATOR OUTPUT LESS THAN 26 VOLTS? YES IF OUTPUT VOLTAGE IS OVER 30.5 VOLTS, REPLACE REGULATOR (Para 4-5.10) NO TEST OPTIONS REASON FOR QUESTION Visual Must know model of alternator to perform proper tests. NO SEE NOTE ON OPPOSITE PAGE G1 IS THIS A NIEHOFF 200 AMP DUAL VOLTAGE ALTERNATOR? YES KNOWN INFO POSSIBLE PROBLEMS ALTERNATOR REGULATOR VOLTAGE  OUTPUT   INCORRECT REGULATOR HAS   ENERGIZING VOLTAGE TEST OPTIONS REASON FOR QUESTION STE/ICE-R TEST 10 AND 90 (pages 2-734 and 2-751) This connection applies full current loading to field coil. Alternator current output should be near maximum. G3 DISCONNECT ALTERNATOR- TO-REGULATOR CABLE. START ENGINE AND SET IDLE 1200-1500 RPM. USING 15-AMP CAPACITY JUMPER WIRE, MOMENTARILY CONNECT PIN A OF ALTERNATOR CONNECTOR TO ENGINE GROUND. DOES CURRENT AND VOLTAGE RISE DURING CONNECTION? YES REPLACE ALTERNATOR (Para 4-5.7). THEN GO TO 5, Page 2-198 NO