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  1. #1
    Bronze Member moojamboo's Avatar
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    Mar 2011
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    92
    Location
    Nothern Vermont
    Tractor
    Ford 1710

    Default bad alternator?

    our Ford 1710 wouldn't start the other day. jumped it and it ran fine. next day dead again. replaced the fan belt because it was loose and had needed to be tightened before with this problem. Still tractor won't start. volt meter on the battery says 11.93 volts jump the tractor on and the batery still reads a steady 11.93 volts even when reved to 2000rpms.

    does this mean i have a bad alternator? is there a test i can do which will tell me if the alternator is bad for sure? could it be a bad battery? is there a way to tell a bad battery vs bad alernator?

  2. #2
    Silver Member
    Join Date
    Jul 2006
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    219
    Location
    Pittsburgh, Pa
    Tractor
    Chinese quality - Jinma 2420 - Ford 1900 - Steiner 420

    Default Re: bad alternator?

    Charge the battery with a charger fully, Then just turn all the lights and accessories on with it turned off and watch the battery voltage. If it goes quickly below 12v after turning everything on then the battery is suspect. If you have a bad cell it will probably drop to 10v and stay there. Each cell is good for 2v of power.
    If the Alternator is bad it won't charge like yours. But, the alternator on these also has a voltage regulator you have to worry about. That makes diagnosis more difficult and usually you end up just guessing and trying one or the other, or end up with both of them replaced !

    Steve

    Ps. I had this problem on my FarmPro Jinma chinese tractor and I bought a delco 3 wire alternator to replace the chinese one. It's worked well ever since. The alternator was $29 for 63amp unit. Out of a 1975 GM product. Bolted right on. Had to rewire a little around the regulator and put a new plug on the alternator end for the field winding.

  3. #3
    Platinum Member DieselMonk's Avatar
    Join Date
    Dec 2004
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    583
    Location
    Nova Scotia
    Tractor
    New Holland / T4.75 Powerstar & Boomer 1030, Case 580 SM II

    Default Re: bad alternator?

    When your alternator is working, you should see at least 13.8V up to 14.7V with a good or dead battery. Doesn't matter. Your case tells me you need either a alternator rebuild, or a new one. Make sure that the alternator isn't slipping in the belt before you run out to replace or fix it.

  4. #4
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,366
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: bad alternator?

    ditto that. check alt or reg, if external... a bad cell will just make the alt work harder to get volts up...

  5. #5
    Bronze Member moojamboo's Avatar
    Join Date
    Mar 2011
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    92
    Location
    Nothern Vermont
    Tractor
    Ford 1710

    Default Re: bad alternator?

    is there a way to check if its the regulator vs the alternator? can a belt being too tight cause a problem with charging?

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,366
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: bad alternator?

    too tight a belt will reduce the bearing life of the alt.. which won't directly, immediatly effect charge..

    might be time to take it to the auto store for a checkup...

  7. #7
    Bronze Member moojamboo's Avatar
    Join Date
    Mar 2011
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    92
    Location
    Nothern Vermont
    Tractor
    Ford 1710

    Default Re: bad alternator?

    If i take the alternator off is that something a local autoparts store could test for me and tell me if its bad?

  8. #8
    Gold Member
    Join Date
    Jul 2011
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    314
    Location
    SE Louisiana

    Default Re: bad alternator?

    every Autozone I have ever been in can do that and the battery while you are at it. I'm sure most others do as well.

  9. #9
    New Member
    Join Date
    May 2012
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    21
    Location
    Lancaster PA
    Tractor
    Mitsubishi mt160d

    Default Re: bad alternator?

    Not sure about yours but most alternator i've worked with have internal regulators so you'd be looking at rebuild/replace.
    some alternators have a wire from the ignition switch to exite the field and get the charging started. again i'm don't know how yours is cofigured.
    Your battery voltage is low. it should be about 12.5v after charging. and not be much below 9.5v while the starter is cranking.

  10. #10
    Bronze Member moojamboo's Avatar
    Join Date
    Mar 2011
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    92
    Location
    Nothern Vermont
    Tractor
    Ford 1710

    Default Re: bad alternator?

    our ford has an external regulator. if i take both to the atuoparts store and the batery i shoudl be able to figure out which piece is bad?

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