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Subject: positive ground or negative ground

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Tom Craig    Posted 12-27-2023 at 17:34:47 [URL] [DELETE]        [Reply] [Email]  
  • positive ground or negative ground
  • Hoping all had a Very Merry Christmas and wishing all a Happy New Year. I purchased a Ford 2n tractor not long ago. It came with negative ground. Should a 2n be positive ground? What would I expect if I changed it to positive ground? Thank You for your help. Tom Craig

    Ed Gooding (VA)    Posted 12-28-2023 at 07:56:45 [URL] [DELETE]        [Reply] [Email]  
  • Re: positive ground or negative ground
  • Your 2N came from the factory as 6-volt, positive ground. Many folks have converted them to 12-volt, negative ground. Is your battery being charged?

    Tom Craig    Posted 12-28-2023 at 13:48:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: positive ground or negative ground
  • Thank You for your responce. My 2n is 6 volt and on a battery tender. Yes it does lose its charge and prompted me to ask this question. I will change it to positive ground as long as no damage to the electrical system happens. Thank You again. Tom Craig

    Tim Daley (MI)    Posted 12-28-2023 at 04:00:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: positive ground or negative ground
  • The FORD N-SERIES System will operate on either 6V/POS GRN or 12V/NG GRN, but each is wired different so do more homework. There is more to it than simply the battery voltage. What is your battery source? Except for 10,000 or so 2N Models built without electrics and rubber using a magneto and steel wheels from late 1942 til early 1943 during WWII, ALL 9N & 2Ns were the same from 1940 thru the end of production in 1947. The 6V/POS GRN electrical system requires: a 6V GRP 1 AG Battery; 1-Wire/3-Brush 11.5A Generator; Roundcan Cutout Circuit; Ballast Resistor; Front Mount Distributor; 6V Coil; 30 AMP AMMETER; 1-Wire Starter Motor with NO RELAY (Solenoid); Ignition Switch; Safety Start Pushbutton; and all wired correctly. Lights were never factory features, always optional dealer accessories. Many 9N & 2Ns wewe switched over to 12V/NEG GRN by farmers and there is nothing wrong with that when done correctly. A 12V system requires: a GRP 35 12V AG Battery; 1-Wire Starter Motor with NO RELAY (Solenoid) and your OEM 6V Starter Motor is fine - Starter Motors can run on 6V or 12V; but the GENERATOR and the CUTOUT CIRCUIT are removed altogether from the circuit and a 12V ALTERNATOR is now installed. The Front Mount Distributor, Square Can COIL, and Ballast Resistor remain intact. If the coil is 6V you will need to add an inline 1.5 OHM Resistor to the coil wire, or, swap it out for a 12V Coil. The OEM Ballast Resistor remains in the circuit regardless if using 6V or 12V. Also, regardless if using a GEN or an ALT, you must have a fan belt tensioning device attached to maintain proper tension on the charging system or else you will never charge the battery and maintain proper fan/water pump cooling. Many 12V conversions use the DELCO 10SI 1-Wire ALTERNATOR and is a reliable, proven setup. You can also use the DELCO 3-WIRE ALTERNATOR as well. There is a 3rd option available, ELECTRONIIC INGNITION, which eliminates the need to install and time points but that is for another day. Here are the PICTOGRAMS by JMOR for the OEM 9N/2N 6V and 12V Wiring Setups:


    9N/2N WIRING PICTOGRAMS:


    9N-12250 BALLAST RESISTOR:

    OEM 9N-10505-B CUTOUT CIRCUIT:

    FRONT MOUNT DISTRIBUTOR & SQUARE CAN COIL:


    NOTE: FIRING ORDER 1, 2, 4, 3 CCW:

    9N-10000-C GENERATOR w/BELT TENSIONER:


    Tim Daley (MI)

    Bruce(VA)    Posted 12-27-2023 at 21:30:39 [URL] [DELETE]        [Reply] [Email]  
  • Re: positive ground or negative ground
  • If it's charging, leave it alone.

    Bruce(OR)    Posted 12-28-2023 at 02:09:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: positive ground or negative ground
  • Unless you desire to test the depths of you pockets with a side dish of frustration.
    Typically the 12V conversion becomes a slight possibility when a large ticket item or two, fails. Prior to that is a waste of finances when not needed.

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