The white ceramic "ballast resistor" in your 12V kit is NOT the OEM Ballast Resistor. It is recommended to use the OEM Ballast Resistor in the circuit when doing a front mount 12V switch over job. You also do not use the ceramic in-line 1-OHM resistor in addition if you have a 12V coil BUT don't assume -often aftermarket, Cheena-made units are mislabeled so test it first. The 1-OHM resistor is only used if you have a 6V coil. The 9N/2N 1-Wire starter motors did not have a solenoid. Are you confusing the roundcan cutout for a solenoid? Having the essential manuals is every bit as important as any tool you own. OEM 9N/2N Wiring, Ballast Resistor, 1-OHM external resistor, OEM roundcan cutout, and 6V wiring diagram. Go to search to get WIRING PICTOGRAMS by JMOR to see and download the 9N setup.NOTE: When switching over to 12V, remove generator and cutout, install 12V battery (GRP 25 or 35), 12V alternator, a 1-OHM ceramic in-line resistor only if using a 6V coil, not used with a 12V coil (recommended). It is important you get all the wiring correct before power is applied. If you have lights, test to verify they are 12V lamps otherwise you will let the smoke out if left at 6V.
FORD N-SERIES TRACTOR FRONT MOUNT DISTRIBUTOR 9N-12250 BALLAST RESISTOR:
EXTERNAL IN-LINE 1-OHM CERAMIC RESISTOR – REQUIRED WITH THE FRONT MOUNT DISTRIBUTOR WHEN USING A 6-VOLT COIL:
FORD TRACTOR 9N-10505-B CUTOUT CIRCUIT:
FORD TRACTOR 9N & 2N OEM 6V/POS GRN WIRING:
FORD 8N-TRACTOR OEM 6V WIRING:
*PICTOGRAM courtesy of JMOR
FORD 9N/2N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: