Re: Ford 2N Ignition Coil Circuit

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Posted by Tim Daley(MI) on August 09, 2022 at 11:16:40 [URL] [DELETE] :

In Reply to: Ford 2N Ignition Coil Circuit posted by Phillip G. on August 09, 2022 at 03:01:03:

You sound like a man who has many questions about his electrical wiring system but were afraid to ask. First of all, there are no OEM FORD MPCs OPERATOR manuals that outline specifically what each voltage and current readings are on every part and component. OHMSs LAW is the natural rule of thumb. The I&T FO-4 Manual has a section, ELECTRICAL AND IGNITION SYSTEM, on testing the 9N-10505 Cutout, 8N-10505 Voltage Regulator, and motor testing the starter motor and generator. Do you mean that picture of a front mount 6V coil that JMOR or BRUCE (VA) posted years ago showing what the resistance of the coil to test static? Set your VOM, digital or analog, it does not matter for this test, to OHMS, with Probe #1 on Pigtail of Coil and Probe #2 on the top terminal wire post. Reading should be 1.5 OHMS +/- .3 OHM. Polarity is not important for this test. A 12V coil should read about double the current. It does not mean the coil is good necessarily. That would take an extremely sophisticated and very expensive test unit so dont read too much into the static test. You must understand the 6V/POS GRN Electrical Wiring System thoroughly and before you attempt to do a 12V switcheroo job. Know what the OEM Ballast Resistor, Cutout Circuit, GEN, Voltage Regulator, AMMETER, Starter Motor, Neutral Safety Start Pushbutton Switch, and Ignition Key Switch are and how each functions, in the systems. Know what a GEN A Circuit and a B Circuit are and how each are different. All 9N and 2Ns were wired the same after s/n 12500 with a 1-wire/3-Brush Generator and the Round Can Cutout, and a one wire starter motor with NO Solenoid. All 8Ns used a 3-Wire GEN with a Voltage Regulator using the A Circuit Design. All this plus knowing how to rebuild, time, test, and mount the front mount distributor correctly; theres a right way and a wrong way. FACT: 99.98% of all non-starting issues are due to incorrect wiring. Invest in the ESSENTIAL MANUALS and additional documents, WIRING PICTOGRAMS by JMOR, and 75 Tips For N-Owners by Bruce (VA).

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






FORD N-SERIES TRACTOR FRONT MOUNT 6V COIL STATIC TEST:


I&T FO-4 MANUAL 9N-10505-B CUTOUT TEST:



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


FORD 9N-10505-B CUTOUT USED AFTER S/N 12,500 TO S/N 258504 ON 9N & 2N MODELS ONLY:


WIRING PICTOGRAMS by JMOR; OEM 9N & 2N ELECTRICAL SETUP:




EXTERNAL IN-LINE 1-OHM CERAMIC RESISTOR REQUIRED WITH THE FRONT MOUNT DISTRIBUTOR WHEN USING A 6-VOLT COIL:


FORD TRACTOR FRONT MOUNT DISTRIBUTOR FIRING ORDER; 1,2,4,3 CCW:



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


Tim Daley(MI)


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