TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 280 of 890
REFERENCE INFORMATION Change 1 2-197 Cracks, glaze, and frays indicate worn belts, which should be replaced (para. 3-81, all except M1123 and "A2" vehicles) (para. 3-83, M1123 and "A2" vehicles). Use a belt tension gauge to determine if the belts need to be tightened, refer to (para 3-82, all except M1123 and "A2" vehicles). BAD CONNECTIONS ARE THE MOST COMMON PROBLEM ! Sometimes just disconnecting, cleaning, and reconnecting will solve a problem. BE THOROUGH! The time you save may be your own. Refer to the functional flow schematic and check the following; 1. BATTERY - make sure all connections are clean and tight, including the shunt and power stud. 2. STARTER - check the high current (heavy gauge wire 6A) wire at the starter. Don't just check for voltage; a loose connection will have voltage but can't carry much current. 3. PCB/DISTRIBUTION BOX INTERLEAVE TESTS 67 AND 89 BATTERY VOLTAGE AND DC VOLTAGE USE CONTROL FUNCTION 06 TO INTERLEAVE TESTS ON THE STE/ICE-R. DIAL 06, PRESS THE TEST BUTTON. WHEN PROMPTED BY THE VTM, DIAL IN TEST 67 AND PRESS THE BUTTON. WHEN PROMPTED AGAIN, DIAL IN TEST 89 AND PRESS THE BUTTON. VTM WILL DISPLAY RESULT FOR TEST 67, THEN 89 THEN 6789, AND THEN REPEAT. SEE TM 9-4910-571-12&P FOR MORE INFORMATION. Disconnect negative battery cable before disconnecting and reconnecting PCB/distribution box harness. There is battery voltage at the PCB/distribution box at all times. Failure to disconnect battery cable will result in damage to equipment or injury to personnel. WARNING Unscrew BOTH connectors and look for bent or broken pins, pins pushed out of their socket, or dirt and corrosion in the connections. TM 9-2320-280-20-1 NOTE 200 AMP DUAL VOLTAGE NIEHOFF ALTERNATOR 100 AMP DUAL VOLTAGE NIEHOFF ALTERNATOR ALTERNATOR