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TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download

Page 373 of 1205

TM 9-2320-387-24-l REFERENCE INFORMATION INSTRUMENTS CIRCUIT 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. RESISTANCE AND CONTINUITY 04,500 OHMS STEIICE-R TEST 91 1. Connect RED clip and BLACK clip to the terminations indicated in the question. RED to the first, BLACK to the second. 2. Start Test 91, 04.500 Ohms. 3. Displayed reading is in ohms. Less than 5 ohms is continuity. If the resistance is over 4.500 ohms, SLUICE-R displays .9.9.9.9. 1: I- f 0 II . . WARNING Disconnect negative battery cable before disconnecting and reconnecting PCB harness. WARNING There is battery voltage at the PC9 at all times. Failure to disconnect battery cable will result in damage to equipment or injury to personnel. Repair harness (para. 4-80). It is important to connect the leads as indicated because you are checking continuity across a diode. The lamp will glow dimly because you are supplying a small amount of power through STUICE-R. You may have to shade the lamp with your hand to see if it glows. A multimeter may not supply enough power to light the lamp. In this case, look for a much greater resistance when measuring with the leads connected in one direction than when they are connected in reverse. BATTERY VOLTAGE MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. Replace lamp (para. 4-20). DC VOLTAGE O-45 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. 54A 458A CONTROLLER WAIT-TO-START LAMP CONllNUlM (RESISTANCE) MULTIMETER 1. Set the voltmeter to an ohms scale of about 1,000 ohms. 2. Connect the RED and BUCK leads to the connections stated in the question. 3. Be sure to read the correct scale. Less than 5 ohms indicates continuity. For an open circuit, the meter should peg full scale (needle all the way to the left). 2-319