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Subject: Installing options(?) for an 8N10000 generator on a 1941 9N

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Lou Puls    Posted 10-18-2021 at 16:38:54 [URL] [DELETE]        [Reply] [Email]  
  • Installing options(?) for an 8N10000 generator on a 1941 9N
  • I need to replace a 9N-10000-C generator on a (6 volt) 1941 9N tractor. I bought a new 8N-10000 that I understand is the available upgrade. It has the same 3rd-brush screw-adjustment and the same (A)rmature-terminal as on the old 9N-10000-C. It also has in the barrel side near the (A)-terminal what I understand to be two threaded holes for the (G)round-terminal and the (F)ield-terminal.
    My interpretation (after reading through the fine but incomplete onsite-documentation that I was able to find) is that there are two options for installing the replacement/upgrade 8N-10000-C : First option, install it as a single-wire, 3-brush generator with the (A)-terminal connected to a new 9N-10505A Cut-Out (regulator), such as was installed the first upgrade 2N-10000 in 1945. The second option would be to install it as a three-wire, 2-brush generator with the (A)-,(G)-,(F)-terminals connected to a new 8N-10505-C Voltage Regulator. My question : Is this interpretation of the two options correct? Any guidance would be highly appreciated by this Newbie.

    Carl    Posted 10-19-2021 at 13:02:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • There is a Service Bulletin saved here somewhere that diagrams the switch over from a 9N/2N GEN & Cutout to the 8N10000 and VR. You delete the old CUTOUT and replace it with the newer 8N Voltage Regulator with the 8N- GEN. You don't use the cutout with the 8N GEN. Must have a belt tension device as well or you'll never charge the battery. Your tractor but I'd stay with the 9N-B or 2N-10000-C GEN and Cutout myself.

    Lou Puls    Posted 10-19-2021 at 20:21:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • Thanks for the response, Carl. I have not yet found the subject of the mysterious reference on page 19 below FIG. 15 (of the remarkably helpful onsite N-History document a.k.a. THE FORD 9N TRACTOR GENERATOR, VOLTAGE REGULATOR, & CUTOU...) that "...there was a Service Bulletin which detailed the procedure to install an 8N-10000-B 3-brush generator on 2N and 9N tractors..." but I have indeed found the April 30 1940 Service Bulletin 71 (page 13) in regard to the changeover to the (early 3-brush) 9N-10000-B generator (and its 9N-10505-B Cut-Out) from the even earlier 30April-deprecated 2-brush generator 9N-10000 (and its voltage regulator 9N-10505-A). As I understand it (and perhaps Deano would agree), the 8N-10000 (and its essentially-equivalent 8N-10000-A, according to page 49 of the FO-4 Manual) are generators that have three brushes and also three terminals [the usual (A)rmature-terminal connection at the oil-cup end, and a thread-tapped hole in the barrel for the (G)round-terminal wire and another thread-tapped hole for an allegedly-insulatable feed-through for the (F)ield-terminal wire connection to a three-terminal Voltage Regulator, allowing its function as a 2-brush generator]. Convincingly from Deano, for its function to actually be a 3-brush generator, the (G)- and (F)-connections need to be jumpered in common for the ground wire to the Cut-Out's grounded base, while the (A)-connection wire leads to the Cut-Out's GEN-terminal. I doubt that my remote and presently-limited resources could help me make a competent insulated (F)-connection feed-through for the 2-brush/Voltage Regulator option at this time, so I think my choice must be to go with the 3-brush/Cut-Out option.
    Thanks again, Deano and Carl, for your responses.
    Lou

    deanostoybox    Posted 10-18-2021 at 21:18:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • If you choose the first option (cutout) you need a jumper from F to G on the generator.
    Otherwise your interpretation is correct.

    Lou Puls    Posted 10-18-2021 at 23:54:51 [URL] [DELETE]        [Reply] [Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • The first option is what I would prefer for the time being, just to get it going soon for driveway work. The jumper sounds like a doable connection I should hope I can manage. So it seems obvious the then-common (F)-(G)-wire is connected to the grounded base of the 9N-10505A Cut-Out and the (A)-wire to its GEN-terminal opposite to its BAT-terminal.

    deanostoybox    Posted 10-19-2021 at 04:44:15 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • "So it seems obvious the then-common (F)-(G)-wire is connected to the grounded base of the 9N-10505A Cut-Out and the (A)-wire to its GEN-terminal opposite to its BAT-terminal."

    As long as the (F)-(G) terminals are connected together it should work fine and be all that is necessary. In the previous versions of the three brush generator that connection is made internally. Adding a wire tying those terminals to the grounded base of the cutout would certainly not hurt anything, and I would not hesitate to do so. It would help to insure the integrity of of the ground connection between those points.

    Lou Puls    Posted 10-19-2021 at 09:41:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: Installing options(?) for an 8N10000 generator on a 1941 9N
  • Thank you very much, Deano -- you have been very helpful to this remotely-located Newbie (50 miles from anywhere anybody ever heard of)!
    Until I can get my analog multimeters working again, I am proposing to just set the 3rd-brush at an intermediate position -- the way the old 9N-generator was always set. I've never had any lights to accommodate, so I just don't want to overcharge the ageing battery before I can check the closing & opening voltages of the Cut-Out to keep the 6.9 to 7.4v range.
    Best regards, Lou

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