TM 9-2320-280-20-1 REFERENCE INFORMATION Change 1          2-333 CONTINUITY (RESISTANCE) MULTIMETER 1. Set the voltmeter to an ohms scale of about 1000 ohms. 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). INSTRUMENTS CIRCUIT Replace harness or lamp, refer to (para. 4-17). 0-4500 OHMS STE/ICE-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, 0-4500 ohms. 3. Displayed reading is in ohms. Less than 5 ohms is continuity.  If the resistance is over 4500 ohms, STE/ICE displays “9.9.9.9.” 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. 0-45 DC VOLTS STE/ICE-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. 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 thru STE/ICE-R.  You may have to shade the lamp with your hand to see if it glows.                                           NOTE 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. There is battery voltage at the PCB/distribution box at all times. Failure to disconnect battery cable will result in damage to equipment or injury to personnel. Disconnect negative battery cable before disconnecting and reconnecting protective control box/distribution box harness. WARNING 6 3 A B E ENGINE CONNECTOR BODY CONNECTOR WAIT-TO-START  LAMP 27 27F 27P 27D 27L 27K 571 571A 459B 569C 583B 54A 458A PROTECTIVE CONTROL BOX/DISTRIBUTION BOX GLOWPLUG CONTROLLER 569A/583A