TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 REFERENCE INFORMATION STARTER CIRCUIT Replace batteries, refer to (para 4-79). BATTERY VOLTAGE STE/ICE-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 glowplugs turn on. Replace batteries, refer to (para 4-79). BATTERY INTERNAL Resistance STE/ICE-R TEST 73 1. Disconnect wire 54A at injection pump to prevent starting. 2. Disconnect glowplug controller and fan solenoid (to keep waveform clean). 3. Start Test 73, battery internal resistance. 4. Wait for the GO massage. Crank the engine. 5. Result is displayed in milliohms. Battery resistance should be 25 milliohms max. Replace cables or starter, refer to (para 4-77 or 4-8). STARTER NEG. CABLE VOLTAGE DROP STE/ICE-R TEST 69 1. Start Test 69, starter negative cable voltage drop. I 2. Displayed reading is in volts. The cable voltage drop should be less than 0.25 volts max. I BATTERY 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. BATTERY RESISTANCE CHANGE STE/ICE-R TEST 75 1. Disconnect wire 54A at injection pump to prevent starting. 2. Disconnect glowplug 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 milliiohms/second. Battery resistence change should be 50 milliohms/second max. 0-45 DC VOLTS STE/lCE-R TEST 89 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. 2. Start Test 89, DC volts. 3. Displayed reading is in volts. VOLTAGE MULTIMETER l. Set the voltrneter to a DC volta 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. 2-283