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  1. NDT

    M1078 4x4 non existent

    Take a look at the schematic and correct me if I am wrong. The only circuit specific to the MD3070 is the "N" solenoid, and per the hydraulic schematic, it controls a valve and not a locking collar.
    • NDT
    • Post #51
    • Forum: FMTV
  2. NDT

    M1078 4x4 non existent

    The interaxle differential mentioned by snotrack is actuated hydraulically, there is a special solenoid for it.
    • NDT
    • Post #48
    • Forum: FMTV
  3. NDT

    M1078 4x4 non existent

    On mine, there is a noticeable clunk that occurs shortly after hitting mode.
    • NDT
    • Post #45
    • Forum: FMTV
  4. NDT

    M1078 4x4 non existent

    The solenoids are powered by "pulse width modulation" so you can't simply disconnect the harness and expect battery voltage to be there. The diagnostic manual I posted will help you, there is info there specifically for the FMTV. You will have to do some learning about this transmission in...
    • NDT
    • Post #19
    • Forum: FMTV
  5. NDT

    M1078 4x4 non existent

    Code 13 13 is ECU input voltage medium low. Is your alternator working correctly? The Allison can't stand working with just battery voltage. Here is the useful WTEC II manual:
    • NDT
    • Post #14
    • Forum: FMTV
  6. NDT

    M1078 4x4 non existent

    In Mode, the WTEC controller commands the transfer case interaxle differential to lock. This does not appear to be happening based on what you describe.
    • NDT
    • Post #5
    • Forum: FMTV
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