TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 286 of 890
WARNING DISCONNECT NEGATIVE BATTERY CABLE BEFORE DISCONNECTING AND RECONNECTING PROTECTIVE CONTROL BOX/DISTRIBUTION BOX HARNESS. 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. TM 9-2320-280-20-1 REFERENCE INFORMATION ALTERNATOR Change 1 2-203 When checking for voltage or continuity in a harness connector (steps A2 and A3), check the wiring at the connector carefully for broken wires. Check to see that the connector pins are not bent, broken, or pushed out of place. Check that the connections are clean and tight. Use the STE/ICE-R in TK mode for this measurement. DO NOT USE THE DCA. Leave the negative battery cable off for the measurement. If there is an open circuit, the STE/ICE-R will measure close to 500 ohms. If you don't have continuity or voltage, and the wires and connections are all ok, then the harness must have a broken wire. In this case you have to replace the wiring harness. Replace harness, notify DS Maintenance. Replace PCB, refer to (para. 4-5). Replace distribution box, refer to (para. 4-5.1). 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”. INTERLEAVE TEST 67 AND 89. BATTERY VOLTAGE AND DC VOLTAGE USE CONTROL FUNCTION 06 TO INTERLEAVE TESTS ON THE STE/ICE-R. DIAL 06, PRESS THE TEST BUTTON. WHEN PROMPTED BY THE VTM, DIAL IN TEST 67 AND PRESS THE BUTTON. WHEN PROMPTED AGAIN, DIAL IN TEST 89 AND PRESS THE BUTTON. VTM WILL DISPLAY RESULT FOR TEST 67, THEN 89 THEN 6789, AND THEN REPEAT. SEE TM 9-4910-571-12&P FOR MORE INFORMATION. INTERLEAVE TEST 67 AND 68. BATTERY VOLTAGE AND DC VOLTAGE USE CONTROL FUNCTION 06 TO INTERLEAVE TESTS ON THE STE/ICE-R. DIAL 06, PRESS THE TEST BUTTON. WHEN PROMPTED BY THE VTM, DIAL IN TEST 67 AND PRESS THE BUTTON. WHEN PROMPTED AGAIN, DIAL IN TEST 68 AND PRESS THE BUTTON. VTM WILL DISPLAY RESULT FOR TEST 67, THEN 68 THEN 6768, AND THEN REPEAT. SEE TM 9-4910-571-12&P FOR MORE INFORMATION. NOTE