TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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REFERENCE INFORMATION BAD CONNFCTIONS ARF THF MOST COMMON PAOPt FM ! 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 wire (heavy gauge wire 6A) at the starter. Don’t just check for voltage; a loose connection will have voltage but can’t carry much current. A 0 11 . . WARNING Disconnect negative battery cable before disconnecting and reconnecting PCB harness. WARNING I There is battery voltage at the PCB at all times. Failure to disconnect battery cable will result in damage to equipment or injury to personnel. 1 3. PROTECTlVE CONTROL BOX - Remove BOTH connectors and look for bent or broken pins, pins pushed out of their socket, or dirt and corrosion in the connections. 4. ROTARY SWITCH - Check the wires at the switch. Don’t just look Feel the connections to make sure they’re snug. Many problems can be solved by seeing with your fingers, not just your eyes. A cold engine should crank at least 100 rpm. A warm engine should crank at least 180 mm. 3EEN - RED TM g-2320-387-24 -1 STARTER CIRCUIT I BAlTERY VOLTAGE STEIICE-R TEST 67 I 1. Start Test 67, Battery Voltage. 2. Displayed reading is in volts. Batteries should be 23-25.5 volts. Batteries voltage will drop when glow plugs turn on. I BAlTERY VOLTAGE MULTIMETER I I 1. Set the voltmeter to a DC volts scale of at least I 40 volts. 2. Connect the RED lead to positive and the BLACK lead to negative. I 3. Be sure to read the correct scale. I VOLTMETER 2-249