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  1. Keith_J

    Preventive maintenance, now big sparks at rear battery.

    Continuity will work just fine. Test black lead of multimeter to negative, red to red. Then the other way.
  2. Keith_J

    Preventive maintenance, now big sparks at rear battery.

    Use diode test on the digital multimeter. Test the positive and negative terminals forwards and back per the video I posted. You have eliminated any isolator fault. Do not worry about the external capacitor, it is only for radio frequency interference suppression.
  3. Keith_J

    Preventive maintenance, now big sparks at rear battery.

    You need to test again, this time using only the negative and positive terminals on each alternator. These are the terminals on the back, the positive is in the recessed portion and should have a red isolator. The drivers side will have a black 6 gauge wire from negative terminal to one of...
  4. Keith_J

    IP rebuild

    If you are storing an injection pump, do not leave diesel in it as diesel with biodiesel will varnish. Rinse and flush with paint thinner with a few ounces of engine fogging oil. Plug and cap all openings, then seal in a heavy bag. When shipping a rebuildable core, be sure to drain all...
  5. Keith_J

    Preventive maintenance, now big sparks at rear battery.

    The passenger side alternator could have damaged isolators on either positive or negative connections. See this video, test between the positive and negative terminals..
  6. Keith_J

    M1010 will not start.....

    Ballast resistors only fail open and they don't fail often. Ballast resistors limit current and function as voltage divider but only when there is current.
  7. Keith_J

    IP rebuild

    The core must be rebuildable, meaning the rotor turns freely. It is possible for the drive tang to break if the rotor seizes. Take the home plate shaped cover off the left side, two screws. You can see the governor basket and a shiny ring with a hole. Through this hole, you can see if the...
  8. Keith_J

    M1009 10 bolt rear

    Stock 1009 rear are 28 spline. GM 14039547. Pull the donor 6 lug axles. If lucky, it will be an open differential which are easier to remove the C clips. G80 are busier to pull apart.
  9. Keith_J

    M1010 will not start.....

    Glow plugs are burned out. No way to cycle faster than the refresh rate on that Klein multimeter. Ballast resistors cannot fail short, they fail open.
  10. Keith_J

    M1010 will not start.....

    Resistors only drop voltage as a proportion to current. With no current, there is no voltage drop. Resistors don't fail short, they fail open. The controller will interrupt glow plug current if voltage is above 16.4 as measured on the thin orange wire going to the controller. This thin wire...
  11. Keith_J

    M1008 wheels

    2011 was the new bolt circle for GM 8 lug, earlier are 6.5 inch bolt circle, 2011 are 180mm bolt circle.
  12. Keith_J

    M1009 Starter Sparks

    Very easy to replace the brushes and bushings on a 27MT. The solenoid contacts can be flipped, the contact plate can only be cleaned as it is riveted on. The plate should rotate to spread wear.
  13. Keith_J

    IP Question

    Stanadyne no longer makes this pump so rebuilt is all that are available. Seals and gaskets are made by various manufacturers, most seem to last at least 10 years. The supply chain has not been contaminated by knock off suppliers. Rubber compounding is still a tightly controlled trade...
  14. Keith_J

    M1009 air intake cleaner

    Welcome to the club. Been running quieter since 2019
  15. Keith_J

    Battery and electric questions.

    Properly functioning and connected glow plug system senses voltage at the glow plugs and shuts off at 16.2 volts. Failure of one or more glow plugs will cause a reduction of pre glow time along with delayed start. The voltage sense wire is the thin orange wire at the glow plug solenoid...
  16. Keith_J

    M1008 rear universal joints

    7801640 is the part number for universal joints. For finding part numbers, the -34P TM has all. I use it on electronic version. Find the figure number from the index, it is broken down by group, this being figure 93. For a M1008, the UOC is 208 so make sure this UOC number is on the...
  17. Keith_J

    Battery and electric questions.

    Stock CUCV charging system is two batteries in series, charged by two isolated negative alternators, also in series. Only the starter is 24 volts, the glow plugs draw off both batteries with a large ballast resistor in series. This ballast resistor is on the firewall, shielded by a black metal...
  18. Keith_J

    My M1009 has died new curve ball thrown Updated

    Do you have a hand vacuum pump? Like Mity Vac? Try to draw diesel into the filter housing. You can also draw fuel through the IP.
  19. Keith_J

    M1009 Starter Sparks

    Brush commutated motors spark, you shouldn't see it as this is a splash and drip sealed motor. Sparks can come from the contacts in the solenoid too. Sparks from the main connection lugs are a problem as this shows poor connection. Simple to swap, disconnect batteries front to back, negative...
  20. Keith_J

    My M1009 has died new curve ball thrown Updated

    IP has a transfer pump which can draw fuel, it doesn't pull air as efficiently. Stock lift pump only moves the quantity of fuel needed, with a new and empty filter, it draws its maximum volume so this can cause debris in the tank to overload the pickup sock.
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