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Subject: 1943 Ford 9N

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Don Kearfott    Posted 07-13-2022 at 11:05:02 [URL] [DELETE]        [Reply] [Email]  
  • 1943 Ford 9N
  • I an restoring a 1943 9N Ford and I was wondering if the resistor suppose to turn red hot when trying to start the tractor? And I can not get any spark to the plugs.

    Thanks
    Don

    Tim Daley(MI)    Posted 07-14-2022 at 04:07:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1943 Ford 9N
  • The FORD 9N-12250 Ballast Resistor will get hot but not red hot as stated. I suggest you get out your wiring manuals and go thru the entire wiring system again with battery disconnected. Are you set up with the OEM 6V/POS GRN system or have you switched out to 12V/NEG GRN? Either way, you need the Ballast Resistor in the circuit. If a 12V system, is your coil 6V or 12V? A 12V setup with a 6V coil requires adding an external 1-OHM resistor to the coil wire inline. Rebuilding the front mount distributor correctly is very important. Rebuilding, setting timing, testing before and after you mount on engine are all SOP. See ‘75Tips for N-Owners’ by Bruce(VA). Follow instructions in OEM Manuals and instructions in our HOW-TO’s forum here. Whichever system you use, your GEN or ALT must use a fan belt tensioning bracket. OEM 2N-10000 GEN came with an attached device; the 9N-10000-C GEN offered a bracket later only for the last 9N unit as shown in picture. You can get free downloadable OEM MPC copies in our MANUALS forum and downloadable copies of WIRING PICTOGRAMS by JMOR in our HOW-TO’s forum.

    OEM FORD N-TRACTOR 9N-12250 BALLAST RESISTOR; USED ON FRONT MOUNT DISTRIBUTORS ONLY:

    JMOR’S WIRING PICTOGRAMS; EARLY & LATE 9N:


    FORD 9N TRACTOR WIRING, AFTER S/N 12500:



    FORD 9N-10000-C GENERATOR w/BELT TENSIONING DEVICE:

    Tim Daley(MI)

    JMOR    Posted 07-13-2022 at 13:56:10 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1943 Ford 9N
  • A is supposed to seat in B. If as in picture, it does not & instead touches other metal parts of distributor, then current is high enough to make resistor glow red.

    JMOR    Posted 07-13-2022 at 13:58:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1943 Ford 9N
  • picture

    deanostoybox    Posted 07-13-2022 at 12:49:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1943 Ford 9N
  • Not supposed to get red hot. Might be the wire from the resistor to distributor is shorted, or the head of the screw that makes the terminal where that wire connects to the resistor is touching the dash, or something conductive has gotten between the screw head and the dash. You can disconnect that wire from the resistor and turn on the ignition. If the resistor gets hot, it is the screw shorted. If not the wire.

    In a factory system, if the ignition is left on, engine not running, points closed, the resistor will get hot. It may even smoke if there is any oily dust on it. It will not get red hot.

    Don Kearfott    Posted 07-14-2022 at 07:58:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1943 Ford 9N
  • Thanks guys, I will check it out this evening.

    Don

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