TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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REFERENCE INFORMATION INSTRUMENTS CIRCUIT TM 9-2320-387-24-l -I -1 I DC VOLTAGE O-45 VOLTS STMCE-R TEST 89 1. Connect RED clip to the indicated test point, BLACK clip to negative or ground. The easiest way to reach the circuit breaker and gauge wiring is to remove the gauge panel screws and pull the panel out far enough to work with the wiring. 2. Start lest 89, DC Volts. 3. Displayed reading is in volts. Replace harness or repair wiring (para. 4-90). Connect the BLACK test lead to a good engine ground and connect the RED test lead to each gauge ground terminal (the uninsulated screw) one at a time and note each reading. You have checked all the wiring that is common to all the gauges and warning lamps. Reconnect wires and return to step 2. page 2-306. and continue testing. BAITERY 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. I STE/lCE-R TEST 91 1. Connect RED clip and BLACK clip to the indicated terminals in the question. RED to the first, BLACK to the second. I 2. Start Test 91,0-4,500 Ohms. 3. Displayed reading is in ohms. Less than 5 ohms is continuity. If the resistance is over 4,500 ohms, SWICE-R displays .9.9.9.9. RESISTANCE AND CONTINUlTY O-4.500 OHMS I CONTINUITY (RESISTANCE) MULTIMETER I 1. Set the voltmeter to an ohms scale of about 1,000 ohms. I 2. Connect the RED and BLACK 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). 2-315