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Page Title: 3. LOSS OF INTERFACE POWER 12 VDC
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TM 9-2320-364-20-4 2-3108 3.  LOSS OF INTERFACE POWER 12 VDC. INITIAL SETUP 1. Repair wire 1785 (see schematic Fig 2-76) or notify DS Maintenance. Verify repair, go to Step 7 of this Fault. START YES NO 12 vdc present at polarity protection terminal B. Wire 1785 from 12 vdc polarity   protection to connector   MC136 terminal B faulty. Wire 1785 from MC136 to   CB27 faulty. Circuit breaker CB27 faulty. Wire 1785 from CB27 to   MC136 faulty. Wire 1785 from MC136 to   MC129 faulty. Wire 1785 from MC136 to   MC130 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89 If wire 1785 from polarity protection device to connector MC136 is loose, faulty or shorted, 12 vdc will not be present at powerbox 2-37. INTERFACE TROUBLESHOOTING (CONT) Tools and Special Tools Tool Kit, General Mechanic’s:  Automotive (Item 74, Appendix G) STE/ICE-R ((Optional) (Item 3, Appendix G) Multimeter (Item 44, Appendix G) Jumpwire Equipment Condition Engine OFF, (TM 9-2320-364-10) Parking brake applied, (TM 9-2320-364-10) Wheels chocked, (TM 9-2320-364-10) Are 10 to 14 vdc measured at connector MC136 terminal B? WARNING Read   WARNING on Page 2-3109

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