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Subject: 2N start button stopped working

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Steve Frysinger    Posted 06-27-2020 at 14:55:29 [URL] [DELETE]        [Reply] [Email]  
  • 2N start button stopped working
  • My old faithful's starter button stopped working suddenly. I can still start the tractor fine by jumping the starter motor, so that works. I tried jiggling the shifter so I doubt it's the safety. And when I put a voltmeter on the posts of the starter switch, it reads 6v, and then drops almost all the way when I push the starter button. In other machines I'd think "solenoid". But my I&T manual only shows the 8n starter circuit, and of course the 8n has a solenoid mounted on the starter motor can. Any suggestions? Any tips where to find a 9n/2n diagram for the starter circuit?

    Tim Daley(MI)    Posted 06-28-2020 at 05:46:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N start button stopped working
  • You need to perform true root cause problem solving methods before you start pulling parts off and replacing with new. Start with verifying wiring is correct and testing the battery at a reliable shop. A 6V (or a 12V) battery does not mean the system is wired correctly. Dead or weak battery is a he culprit for non-starting. How do you jump start your tractor? Do you have 1-Wire generator with a belt tensioner AND the cutout? The neutral safety starter pushbutton is NOT a solenoid. ALL the 9N/2N wiring diagrams are in the Essential Manuals; Owner, MPC's, and the FO-4 manual -got 'em? You can download the MPC's in our MANUALS forum. Here's a taste for you.

    FORD TRACTOR 9N & 2N, AFTER S/N 12500, OEM 6V/POS GRN WIRING:



    FORD 9N/2N ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

    Tim Daley(MI)

    Steve Frysinger    Posted 06-28-2020 at 09:14:32 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N start button stopped working
  • Thanks for the diagrams - I can't find my copy of the FO-4 manual.

    I should have been more clear about my symptoms:

    1. I started the tractor in the morning as normal, with plenty of crank at the starter. It ran (and runs) fine.

    2. After a break when I went to restart I got NO response to the starter button (no sound at all).

    3. I was (and am) able to jump the tractor from an external battery by connecting that battery's negative to the starter motor lug, and touching the positive to the foot peg. It cranks fine and starts right up, so the starter motor is fine. After jump starting I ran it for several hours yesterday.

    4. I put a charge on the battery overnight to make sure it's at full charge. Even with a 6 amp charger connected I get NO sound when I press the starter button.

    5. Suspecting a problem with the starter switch connected to the safety starter button I put a voltmeter on the terminals of the switch. It reads full charge until I press the starter button, and when I push the button the voltage drops significantly, suggesting that the starter button IS still actuating the starter switch, and that the starter switch is making electrical contact.

    5. So it seems clear that there was a sudden break in the connection between the starter switch and the starter motor. Since the 2n doesn't have an external solenoid I'm looking for likely places to check, but couldn't find my copy of the 9n/2n electrical wiring diagram.

    6. Looking at the diagram you sent, it must be with the cable between the switch to the starter motor, UNLESS there is a solenoid built into the starter motor. IS there one? Even though the starter motor works, it's possible an internal solenoid (if one exists) has failed.

    7. To be clear, I haven't changed any parts.

    Thanks!
    Steve

    Tim Daley(MI)    Posted 06-28-2020 at 12:40:33 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N start button stopped working
  • Take your battery to a reliable shop and have it bench tested under load on their test equipment. Just because you apply a battery charger don't assume it will charge a dead battery -it won't. NO NO NO, there is NO solenoid on the 9N/2N starter motor- not the problem. Study your diagram. Do you have the 1-Wire Generator with the roundcan cutout? Do you have a belt tensioning device on the genny? If belt tension isn't maintained, you will never charge the battery with your genny. You can motor test genny, starter, battery and cutout at your trusty shop. Best to download the MPC's -save on your desktop in a folder (they are free -need Adobe to get them in pdf) and find your FO-4 manual.

    FORD TRACTOR 9N-10505-B CUTOUT CIRCUIT TEST:


    Tim Daley(MI)

    Steve Frysinger    Posted 06-28-2020 at 13:54:35 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N start button stopped working
  • Take your battery to a reliable shop and have it bench tested under load on their test equipment.

    Yes, that was my last resort (once I eliminated other possibilities). Taking
    the battery to the shop these days is riskier than for most folks, given my
    age and medical history. So I wanted to eliminate other possibilities first.

    It just seemed strange that the battery ran the starter fine early in the day
    and then couldn't bump the starter at all. I suppose a plate might have shorted,
    though I would think the voltage would be reading less than 6 volts (which it is).

    NO NO NO, there is NO solenoid on the 9N/2N starter motor- not the problem.

    Thanks - that's what I was trying to rule out.

    Study your diagram. Do you have the 1-Wire Generator with the roundcan cutout? Do you have a belt tensioning device on the genny?

    Yes, and I replaced the generator a few years ago, after which the tractor kept
    the battery charged for a couple of seasons. But maybe it quit - my ammeter
    doesn't work so I plan to replace that.

    If belt tension isn't maintained, you will never charge the battery with your genny. You can motor test genny, starter, battery and cutout at your trusty shop.

    Couldn't find a local shop to test the generator, but I was able to bench test it myself
    when I replaced it (tested the one I bought too). I put in a new cutout when I did that.

    Best to download the MPC's -save on your desktop in a folder (they are free -need Adobe to get them in pdf) and find your FO-4 manual.

    Will do. Thanks!

    Ken N Tx    Posted 06-28-2020 at 02:24:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N start button stopped working
  • ......................
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