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  1. R

    M1078A1 Caterpillar pin outs on computer schematic

    two thumbs up... or you can add a plug to that test light and add a 50w halogen fog light(4A@12V) as a load...:) I have an old 100W aircraft light i keep around for 24v testing(same 4A@24v)... They added a few EMI circuits on these trucks. look at the heater blower, windshield wiper and...
  2. R

    Clunking in drivers dash, foot area or under the floor – M1078A1?

    It is probably A M9 some troop hid in the void space rattling around.
  3. R

    1997 1078 parking and trai.er brakes not releasing.

    I did it. I put in an Isspro dual needle mechanical air gauge(one red, one white needle). The transducers are also the low pressure switches so you will need 2ea 1/8" NPT "T" fittings, two haldex 66PSI low brake air pressure switches and some poly oil pressure gauge install kits.(2ea 1/8NPT to...
  4. R

    M1088A1 Starting Issue

    Well like I said above, what turns on or doesn't turn on with the ign on, when it wont start should point you right toward the issue... oil idiot light: yes or no k26: yes or no k11: yes or no
  5. R

    M1078 no crank blows fuse

    Do you get an oil pressure idiot light when you turn on the ign? K26 and K11 both must energize when you turn on the ign in order to enable the start pushbutton as K11 provides the power to the button when it is energized. K26 is controlled by the transmission neutral start signal. It...
  6. R

    Brakes.. oh my...

    Wow, thats terrible!
  7. R

    M1078 LMTV Fix-up Thread

    yea, I am tempted to build a maintenance trench in its normal parking spot. Its too far from the ground creeper to up in between the frame rails:) I saw an elevating creeper used by aircraft owners, but was a little too rich for my tastes and I will probably not ever have a pad or shop large...
  8. R

    Caterpillar 3126B oil cooler problems

    Yea you could have a perfect oil filter and cooler assembly, but a HEUI pump failure is probably going to wipe the injectors also… our main oil system actually has 2 bypasses in it. One pre-cooler, the other pre-filter..
  9. R

    Caterpillar 3126B oil cooler problems

    And you did a fantastic job! :)
  10. R

    Caterpillar 3126B oil cooler problems

    Maybe the heat tolerance of the cooler portion was a controlling factor in the decisions made...
  11. R

    Air Bag Question

    Leveler air(from the ports on the front of the leveler valve should feed both airbags equally(those 2 ports are tied together in the valve). The check valve is in line to allow flow BACK to the manifold when pressure is removed/vented when the cab suspension valve is released. If that check...
  12. R

    M1088A1 Starting Issue

    K26 should stay on till you shift out of neutral the transmission neutral signal controls its power and its ground is fixed. K11 cannot come on unless K26 is on as k26 provides the power to k11... K11 also cannot come on unless you have an oil pressure idiot light as the oil sw on the engine...
  13. R

    1083A1 Engine Cooling Issues

    So 3126, high temp light should be ~230F either controlled by the ECU or a thermal sw on the thermostat housing… was your fan cycling/did it engage above 205F? With air tanks full(dryer purges), shut down the engine and with the ignition switch off, reach in under the front of the truck and...
  14. R

    What have you done to your FMTV or LMTV today

    Had some friends stop by and help me put up the first wall panel:)
  15. R

    M1088A1 Starting Issue

    K11 does double duty. when energized it provides power from CB77 to the start button. When it de-energizes it provides that same power to the alternator to energize it after start. K26 provides the power to K11s coil and the oil idiot light ckt provides the k11 path to ground. So as soon as...
  16. R

    M1088A1 Starting Issue

    Hmmm well the no clicking is a significant clue. If it were a starter issue you should still get the aux start relay down on the drivers frame rail clicking when the button is pushed... The LD's that are missing are the more significant clue. LD26/K26 neutral start and LD11/K11 alt excite...
  17. R

    What have you done to your FMTV or LMTV today

    Habitat restraint hydraulics installed.
  18. R

    LMTV Caterpillar Diesel Fuel Additives

    I just heard that story from John:) Used to have a real good machine shop here locally, then he retired and no one ever picked up the business. haven't had to search for one in a while... Joys of being rural...
  19. R

    M1088A1 Starting Issue

    No clicks at all with a button press? What relays are powered when you turn on the ignition? What year is this truck?
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