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Recent content by Ronmar

  1. R

    Transfer Case Lock Health Check

    Well C7 pressure still isn't a "health check" it just means it is trying to send pressure... You could also look at the diff-lock indicator signal, which it alters when the difflock is commanded by the transmission via the mode indicator signal. These trucks use that signal(trans wire 125) to...
  2. R

    Just won an auction - M1088A1

    there are a couple unused plugs under the pax dash. The trucks use a generic wire harness that supports different options that may or may not be installed in a particular vehicle... The A1 schematic table is not as complete as the A0(doesn’t show all the Plugs in the list) Message me and I...
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    Just won an auction - M1088A1

    well the A1 schematics are in the tech manual section here on SS. Forget what year your truck is?
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    Just won an auction - M1088A1

    All the flasher power passes thru the hazard switch(its powered all the time) the flasher output passes thru the turn signal switch. Here is a condensed lighting diagram I drew once upon a time:) if the hazard sw gets unplugged the TS wont flash… The cable should have a metal tag with a...
  5. R

    WTECIII display shows “X” with mode light illum

    No VIM on a wtec3, they separated the TCU from the controller on the 3 and put the TCU in that same place under the passenger dash… They moved the relay functions provided by the VIM up into the main power panel…
  6. R

    WTECIII display shows “X” with mode light illum

    so TCU under the passenger dash or the wiring between the two?
  7. R

    WTECIII display shows “X” with mode light illum

    well if it won't even enter diag mode, it sounds as if the pushbutton controller and TCU are not communicating, so an issue with one or the other or the cables in between... i wonder if Allison doc or a scantool can talk to the TCU?
  8. R

    WTECIII display shows “X” with mode light illum

    What year truck? this is a WTEC3 controller. This looks like it is missing something major for basic operation. The system gets battery voltage all the time, and switched ignition power to activate. Are both these present(2 separate fuses/breakers). Next would be to check interconnect...
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    Just won an auction - M1088A1

    When I was young and learning to ski, my brother, a ski instructor, once told me, "if you are not falling down, you are not learning anything"... Applicable wisdom to a lot more than skiing...
  10. R

    What is the history of A/C in FMTV vehicles?

    I believe it is txv and the valve is in the evap unit…
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    Just won an auction - M1088A1

    The tank vent typically runs up to the cab suspension arch and is loosley folded over and zip tied with the latch hydraulic line. on the A0 they use an electric pressure sensor for the pri and sec gauges. It also incorporates the low air switch set for ~85PSI the park/emergency lights in the...
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    LMTV ECU Voltage Regulator location?

    electrically controlled/electronic transmission, so the power system must be correct for proper operation. clean all the connections between batts and power panel. The grounds are trash on al these vehicles. Clean all the grounds... starter to drivers frame, alt to frame, cab to frame...
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    LMTV ECU Voltage Regulator location?

    nevermind
  14. R

    Looking for TMs for the early A1 trucks

    Well beyond the wiring, engine and ABS they are basically the same truck, and the A1 and A1R electrical drawings are also available here in the TM sections… the core mechanical info for chassis, transmission and axles are pretty-much the same(A1R uses high pinion rear axles)… The military...
  15. R

    Lmtv CTIS PCU Solenoid PN

    I missed the zero ohms report...
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