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Subject: 1952 8n electrical question; 'spinning generator'

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Kenneth T. Meyer    Posted 06-18-2018 at 15:20:55 [URL] [DELETE]        [Reply] [Email]  
  • 1952 8n electrical question; 'spinning generator'
  • 9299 I have 1952 8n which I have owned for many years. It is positive ground; 6 volt. It has been rewired with new wiring; as original. This last weekend when I was running it I noticed that the amp gauge was registering more '+' positive; than I remember it ever doing. When I shut down the engine I heard a noise and when I checked it I noted that the generator was still spinning! This was with the ignition key off! Switching 'on' and 'off' did not stop anything. I then removed the battery cable, and then it stopped spinning. A little while later I hooked the battery back up and everything was fine again and I started it as I normally do and ran it again a bit and then shut it off and the generator did not spin again this time. I started it again later and it was again OK except for the '+' ammeter. I have never experienced this and am wondering if it could be a regulator problem. As mentioned the only thing I thought to be not 'normal' was the ammeter being too much on the 'plus' side when running. Anybody have any ideas? Thanks, KTM

    Kenneth T. Meyer    Posted 06-19-2018 at 11:26:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • Wow,... Great responses from everyone. Thank you very much!! I will check the ammeter for a draw down with lights connected as I do not have them on the tractor; as I sometimes go through brush in the woods on the trails. I think the ammeter is the induction type and not directly wired if my memory is right. The belt is obviously loose enough to allow the generator to 'spin' but tension is adequate so it does not obviously slip when engine is running. I will check belt tension though, as I did not realize the possible issue until the mystery of the 'spinning generator'. Could someone give me a run through on how to best 'polarize' that generator; which I believe is the original type? Also, what is suggested belt tension in deflection of belt? I think why everything worked as is was is that centrifugal force was enough to make the belt not seemingly slip. The tractor is a couple of hundred miles North of where I am in Twin Cities (Mpls/St. Paul) so I will follow up on any and all suggestions when I return to the farm next week. I do have a copy of the Ford/New Holland Operator's Manual for 9n, 2n and 8n; which I will dig through as it has some maintenance info etc. Thanks again guys!! Suggestions were great! KTM

    Tim Daley(MI)    Posted 06-19-2018 at 12:44:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • Forget the NH manual, get copies of these:

    Also, what JMOR said about polarizing genny was why I said it wouldn't matter. There is also a ton of useful info in our HOW-TO's forum, polarizing is included, but not your problem. Belt tension is shown to be 1/2" deflection when pressed with the thumb. As your '52 uses the later generator, mounted on the LH side, it should also have the correct mounting/tensioning bracket too.


    Tim Daley(MI)

    JMOR    Posted 06-19-2018 at 11:56:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • Since it was charging (and also 'motoring') thee is no reason at all to polarize the generator, as either motoring or charging automatically polarizes.

    Tim Daley(MI)    Posted 06-19-2018 at 04:23:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • -as mentioned likely a VR issue -is it the original AUTO-LITE unit -see picture below. Belt tension too can affect that. Is AMMETER original induction style? By 'registering more '+' positive' -like more than 10 AMPS? You say after reconnecting the battery and restarting/shutting down engine, the spinning stopped, was OK except the '+' ammeter. When you flip on the headlight switch, does the ammeter show any change? It should show a '0' or NEG (-) reading. It shouldn't matter but can try to polarize generator next time you disconnect/reconnect battery cable before starting up.

    Tim Daley(MI)

    JMOR    Posted 06-18-2018 at 15:52:10 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • If wired as original factory ammeter was, then it is a net reading ammeter, so it should have been showing a major negative (discharge) while generator spun with engine stopped. No doubt that the cut out contacts inside the regulator were stuck closed. If it happens again, give the regulator can a sharp wrap & the spinning will likely stop as contacts are jarred open. Key on or off is irrelevant.

    Joe in Texas    Posted 06-18-2018 at 18:35:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • Just to clear my mind, how is the generator still "spinning" with the engine shut off? Especially if the belt is as tight as it should be....

    JMOR    Posted 06-18-2018 at 19:02:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • I would say that you answered your own question......belt not tight.

    36 coupe    Posted 06-28-2018 at 07:38:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 8n electrical question; 'spinning generator'
  • A worn belt can bottom out.

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