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Subject: 9N- Electrical Wiring

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raski    Posted 04-07-2021 at 04:47:05 [URL] [DELETE]        [Reply] [Email]  
  • 9N- Electrical Wiring
  • Yesterday, I was installing the 6V battery in my 9N as I have done for many years. Upon snugging up the braided positive(GROUND) cable, I started hearing a sizzling sound. Before I could loosen and yank the grounded positive cable off the battery, smoke filled the barn and I could not even see the battery to do so. I finally was able to disconnect and remove the battery. From what I could see, the old "yellow" colored wiring connecting to the ammeter had worn insulation from age and shorted out to the chassis from my disturbing during the battery installation.I have plenty of 12GA wiring and plan to rewire the tractor. I believe the ammeter got fried as it is series connected and is all fogged up now. Is this just a "standard issue" 30 amp ammeter and where is a good parts source? I also plan to replace the badly corroded ballast resistor. What is the value of the ballast resistor for my 6V 9N? I could kick myself for not paying better attention to the condition of this old wiring..

    Tim Daley(MI)    Posted 04-08-2021 at 06:02:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N- Electrical Wiring
  • First, it's best to start going thru the entire wiring system, step by step, to ensure your system is correctly wired. Just because you have a 6V battery does not mean it is wired as the OEM 6V/POS GRN system. If you are shorting out wires, it might be a good time to invest in a new harness or if wiring yourself, do it right. The OEM AMMETER was the Induction/Loop Style 30/30 gauge. The wire fed thru the 'LOOP' on the back of gauge and registered induction. If readings were backwards switch the direction of the wire feed. All new gauges are the two screw terminal type. (Series??? Huh???) Thus if gauge charge reads backwards, simply reverse the wires on the screw terminals. A badly corroded resistor doesn't mean it doesn't work. So, you plan to buy a new AMP Gauge and a new Ballast Resistor. There were two Ballast Resistors - one for the 9N & 2N tractors and one for the 8N. The only difference is the mounting screws, but functionally both are the same. LINK below is for the 9N model. Is the wiring with the 1-Wire/3-Brush GEN and the Round-Can Cutout? Is battery new? Have you tested it whether new or old? A new resistor will get hot and smoke a bit when it is first powered up -completely normal so don't freak out, providing all other wiring is correct. Wire correctly and before first before applying power to battery. Lastly, get your Essential Manuals and JMOR's Wiring Pictograms to roadmap your system. Whether a GEN or an ALT, you need the Ballast Resistor in the system. Likewise you must have a fan belt tensioner device otherwise you will never charge the battery.

    FORD TRACTOR 9N & 2N OEM 6V/POS GRN WIRING:



    FORD 9N/2N WIRING 6V & 12V:

    FORD N-SERIES TRACTOR FRONT MOUNT DISTRIBUTOR 9N-12250 BALLAST RESISTOR:


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

    raski    Posted 04-08-2021 at 08:23:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N- Electrical Wiring
  • Thanks Tim for the advice. I will verify all your your suggestions before proceeding.

    Bruce(VA)    Posted 04-07-2021 at 08:45:34 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N- Electrical Wiring
  • Get the oem ballast resistor and a replacement ammeter from Jus8N's.

    The resistor value is .3 ohms cold, 1.7 ohns hot.

    Make sure you are attaching the wires to the meter & not the mounting screws. You won't do that but once.

    raski    Posted 04-08-2021 at 08:26:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N- Electrical Wiring
  • Thanks Bruce. I will check the ballast with my DVM when I have it out of circuit. If it is indeed good, I will continue to use it.

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