In Reply to: 9n wont turn over posted by will on June 09, 2020 at 19:52:19:
Verify your battery is good; don't assume just because you apply a charger it is good -have it tested at a trusty shop. Next, verify the entire wiring system is correct. Essential Manuals and Wiring Pictograms by JMOR are required reading if'N ya wanna be an N-Owner. Many 12V switch out jobs are done by 'shadetree mechanics' and wired incorrectly. There are but a few methods to switch over to 12V and a thousand incorrect ways to do so. The 9N starter motor is a 1-Wire Unit with NO solenoid. Is this what you have? next, the 9N (after s/n 12500) & 2N models used the roundcan cutout circuit with the generator. Is the cutout removed from the 12V circuit? It should be removed. Is the OEM Ballast Resistor in the circuit? It should be in the circuit. Does your new alternator have the correct fan belt AND a belt tensioner device installed? It should be? Is your coil the OEM 6V one? If so, you need to add an inline white ceramic 1-OHM resistor to the circuit. If your coil is 12V the extra resistor is not used. Are you running lights? If so, disconnect for now, you can hook the lights back up when you get all else right. Take the battery to your trusty shop and get it bench tested under load, and meanwhile use your VOM (NOT a test light)set to continuity and your Pictogram diagram to verify the entire electrical wiring system is correct. Don't assume wire colors are right, they seldom are OEM, and colors don't conduct electrons. take NO shortcuts or skip steps. Don't assume. Root cause problem solve.
FORD 9N/2N WIRING 6V & 12V:
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 9N-10505-B CUTOUT –USED AFTER S/N 12,500 TO S/N 258504 ON 9N & 2N MODELS ONLY:
FORD 9N/2N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: