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  1. #31
    Bronze Member
    Join Date
    May 2010
    Posts
    79
    Location
    Triangle, VA
    Tractor
    4720, 455

    Default Re: JD 820 - 6 volt alternator on a 12 volt tractor?

    I had an old JD lawnmower that used a generator similar to the one shown. I rewired it myself. It was also the starter and after the tractor started would switch over to generating DC current. Worked great for 18 years until hydrostatic trans went, then I traded it in for my 455.

    JPC

  2. #32
    New Member
    Join Date
    Sep 2011
    Posts
    12
    Tractor
    1973 John Deere 820 3 cylinder

    Default

    Does anybody know how fast the engine should spin at idle? If I knew that I could figure out how fast the alt is going (and the right size for the pulley).

    And does it hurt anything to spin the alt below 400 RPM?

  3. #33
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,901
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: JD 820 - 6 volt alternator on a 12 volt tractor?

    nope.. just won't charge...

    soundguy

  4. #34
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,398
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: JD 820 - 6 volt alternator on a 12 volt tractor?

    Quote Originally Posted by glenhenshaw View Post
    Does anybody know how fast the engine should spin at idle?
    Off the cuff, no less than 800 ERPM.
    We have too much gun control.
    What we need is more idiot control.

  5. #35
    Platinum Member
    Join Date
    Dec 2001
    Posts
    971
    Location
    Maryland

    Default Re: JD 820 - 6 volt alternator on a 12 volt tractor?

    You might find that the alternator will work better after you get the new indicator bulb. With the broken bulb, the energizer circuit is open and it has to self-energize. That is the reason you need to rev engine to charge.

  6. #36
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,901
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: JD 820 - 6 volt alternator on a 12 volt tractor?

    once it excites, it should stay charging down to 400 rpm though.

    in any case.. 3 wire setup is best IMHO..

    soundguy

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