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  1. OPCOM

    M818 battery switch acting up, voltmeter

    wow. they have all kinds of other interesting lamps as well! I need one to find out if the glow plug heater/igniter is working. I replaced the plug some time ago and read 6V on it, but despite confidence it is squrting diesel in, I can't say I have ever known if it is lighting off the fuel...
  2. OPCOM

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    Please post pics how the pyro is installed in the manifold!
  3. OPCOM

    M818 battery switch acting up, voltmeter

    The new control box fixed it. Also straightened up the fuel gauge which had been acting funny, reading high. I might as well say where I got it, because it was the right part, works perfectly, and was at the best price I found or was offered for an apparently brand new part in the original box...
  4. OPCOM

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    The talk about running up hills and the EGT going through the roof.. With the stock PT pump and stock settings, all 'to spec' will this happen or does the PT pump limit the fuel rate, by virtue of its pressure-time RPM-dependent operation? I have not noticed any issues after putting a T1138...
  5. OPCOM

    Spin on conversion DONE !!! M809 NHC 250

    It's a fleetguard. see earlier in the thread for PN.
  6. OPCOM

    M818 battery switch acting up, voltmeter

    A dead box should be cheap enough to find. There's the plug. I don't know how hard it is to cut open, but the plug might come off with rivets and come far enough out to cut the wires off, then you can clean up the connector and reuse it. For my part I do want to keep the...
  7. OPCOM

    M818 battery switch acting up, voltmeter

    A brand new control box protective should be here this week. The prices are sure all over the map on these things. It's black and new production surplus, but I can live with that I wonder if it is the little relay that went bad.. not to blame it because it's small though. My guess from the...
  8. OPCOM

    will these 10 lug rims fit a 5 ton?

    semi tractor Budd-type wheels will fit. The aluminum ones have thick centers and you might have to put in longer front studs.
  9. OPCOM

    Deuce driving tips

  10. OPCOM

    M35 Alternative Transmissions?

    There is no known trans to replace that size, at least not discovered yet. If getting rid of the 'hole' between 3rd and 4th gears is wanted, put the gasser trans in a multifuel but the speed will be reduced to "4th" speed, no OD. Then there is the higher OD kit for the multifuel, be sure it...
  11. OPCOM

    M818 battery switch acting up, voltmeter

    I'll place a want ad in the classifieds for a new one. I'd take a known good one from someone I know. The rebuild can wait on my pleasure.. I have to do the Veterans day parade. I have a box of those solenoid type relays from aircraft surplus.
  12. OPCOM

    M818 battery switch acting up, voltmeter

    I see the two big relays, but there appear to be three in the schematic.
  13. OPCOM

    Dash Panel LED Bulbs

    if you do your own electronics, STMicroelectronics makes many LED power supply, DC-DC converter, and PWM-able integrated circuits. I had been using a buck converter (normally these convert example 24V to 12V, etc.) with a resistor in the GND leg of the LED to provide the feedback voltage, which...
  14. OPCOM

    regular battery chargers

    Here is the file as a PDF.
  15. OPCOM

    M818 battery switch acting up, voltmeter

    The schematic shows that it is a box full of relays and maybe two diodes, hard to see on the diagram. I suspect they are more like aircraft style contactors inside, but the box does not seem to have screws on it (it was dark when I was looking) It makes sense because today it cranked...
  16. OPCOM

    M818 battery switch acting up, voltmeter

    In the 818, I turn the battery switch ON and there is something odd going on. This is the main power switch for the truck I assume. Normally, when on, the voltmeter should read in the low green, and after starting, the voltmeter should read higer in green, as it is charging. What I am...
  17. OPCOM

    Mack engine advice, swaps?

    My brother is still trying to get the truck transported. It weighs 12K LBS and is in Mansfield. Must go to Sanger. There is a pro that quoted $300 for the move, I think he better say yes.
  18. OPCOM

    ***Fraud Warning***

    My eBay ads always say: "Ships to USA street address (no P.O. boxes) by FedEx ground/home only." Why?
  19. OPCOM

    Mack engine advice, swaps?

    These are not the truck in question, just ones like it. I'll post a pic or two once I get to see it. too bad he can't keep it but at least it won't get scrapped since he already bought it!!
  20. OPCOM

    Mack engine advice, swaps?

    here's a video of a 1964 being started. His is not a dump like this, it has a 5th wheel. Would make a nice 'giant pickup truck' https://www.youtube.com/watch?v=Sj6nI4U0AR0 1951 model https://www.youtube.com/watch?v=5wh5tkDV3ik&feature=related...
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