TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-l REFERENCE INFORMATION STARTER CIRCUIT BAlTERY VOLTAGE STEIICE-R TEST 67 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. Replace batteries (para. 4-74). BAlTERY INTERNAL RESISTANCE STEIICE-R TEST 73 1. Disconnect wire 64A at injection pump to prevent starting. 2. Disconnect glow plug controller and fan solenoid (to keep waveform clean). 3. Start Test 73, Battery Internal Resistance. 4. Wait for the GO message. Crank the engine. 5. Result is displayed in milliohms. Battery resistance should be 25 milliohms max. STARTER NEG. CABLE VOLTAGE DROP STEIlCE-R TEST 69 Replace cables or starter (para. 4-72 or 4-l 1). 1. Start Test 69. Starter Negative Cable Voltage Drop. 2. Displayed reading is in volts. The cable voltage drop should be less than 0.25 volt max. I MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. BAlTERY RESISTANCE CHANGE STE/lCE-R TEST 75 1. Disconnect wire 64A at injection pump to prevent starting. 2. Disconnect glow plug controller and fan solenoid (to keep waveform clean). 3. Start Test 75. Battery Resistance Change. 4. Wait for the GO message. Crank the engine. 5. Result is displayed in milliohms/second. Battery resistance change should be 60 milliohms/second max. DC VOLTAGE O-45 VOLTS STEXE-R TEST 69 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. 2. Start Test 69, DC volts. 3. Displayed reading is in volts. VOLTAGE MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. 2-269