TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 311 of 890
2-224.2 Change 1 TM 9-2320-280-20-1 ALTERNATOR DIAGNOSTIC FLOWCHART F.1-1 TEST OPTIONS Visual REASON FOR QUESTION Must know model of alternator to perform proper tests. TEST OPTIONS STE/ICE-R TEST 10, (interleave with control function 01 of page 2-734 then 89, page 2-750) REASON FOR QUESTION Determine if high or low output voltage. F.1-2 NO YES See note on opposite page IS THIS A NIEHOFF 100 AMP DUAL VOLTAGE ALTERNATOR? START ENGINE AND ALLOW TO IDLE AT 1200 - 1500 RPM FOR 2 - 3 MINUTES. NO YES If output volt- age is over 30.5 volts, replace reg- ulator (Para. 4-5.6). F.1 FROM B1 Page 2-204 TEST OPTIONS STE/ICE-R TEST 10 AND 90 (pages 2-734 and 2-751) REASON FOR QUESTION This connection applies full current loading to field coil. Alternator current output should be near maximum. F.1-3 DISCONNECT ALTERNATOR-TO- REGULATOR CABLE. START ENGINE AND SET IDLE 1200 - 1500 RPM. USING 15-AMP CAPACITY JUMPER WIRE, MOMENTARILY CONNECT TO ENGINE GROUND. DOES CURRENT AND VOLTAGE RISE DURING CONNECTION? NO YES Replace regulator (Para. 4-5.6). Then go to 5, page 2-198 Replace regulator (Para. 4-5.6). Then go to 5, page 2-198 KNOWN INFO Voltage Incorrect POSSIBLE PROBLEMS Wiring Alternator Regulator KNOWN INFO Voltage Output Incorrect Regulator has Energizing Voltage POSSIBLE PROBLEMS Alternator Regulator Wiring