In Reply to: no spark posted by mark on December 13, 2018 at 23:00:44:
Welcome aboard the NTC! Was the tractor running prior to your 'no spark' issue? Did you change anything? Chances are that your 9N 12-volt switch over job was done incorrectly, I surmise; "...ammeter has been bypassed..." makes me think more than it was bypassed. You can find a lot of DIY documents and information in our HOW-TO's forum. One very important document there, under "ELECTRICAL", was put together by a long time member here who is a certified electrician and knows these old Fords well. Click on the LINK below to see JMOR's Wiring Pictograms. JM has created a great document showing all the CORRECTY ways to wire these old N's whether 6V/POS GRN or a 12V switch job. There is a little bit involved than just swapping out the battery to a 12V unit. The distributor is a key element. Just setting the ignition breaker points to .015" is only the first step. Did you test the distributor before re-mounting it? Is the OEM Ballast Resistor in the circuit? Is the coil a 6V unit or a 12V unit? Is the generator and cutout removed and an alternator installed? The battery specific gravity must test good. The battery must sustain a full charge under load to be effective. Your local starter shop or auto parts store can bench test it fast and for free. If your square coil on your front mount distributor is 6-Volts, you must use an in-line external ceramic 1Ù (OHM) resistor. If you invest in a square 12V coil, you do not need to add the 1Ù ceramic part. Realize that 99.98% of all non-starting issue with these old Fords is due to incorrect wiring jobs whether 6V or 12V. Begin by getting the battery tested and going thru the entire ELECTRICAL WIRING system. No OEM parts get removed on a 12V system other than the generator and cutout. Verify wiring is correct. Verify the distributor is working -remove it and go thru step by step. Firing order is 1,2,4,3 CCW. Get the essential manuals. The I&T F-04 Manual is very important tool. Here are some original wiring diagrams for the 9N/2N tractor. Use them for a guide as well. Certify that the ignition key switch, the neutral safety starter button/switch, the ammeter, the starter motor, and the Ballast Resistor are all in the circuit wired as OEM. Spark plugs, Champion H10 or H12, or Auto-Lite 437 spark plugs gapped at .025" - .028". Once the wiring is certified to be correct, you will perform the fuel flow test. If you need help with your front mount distributor, Farmer Dan, dedicated member here, rebuilds them. You can email me if you want more info. Baby steps. Report back with results.
FORD 9N/2N TRACTOR OEM 6V/POS GRN WIRING DIAGRAMS:
FORD TRACTOR FRONT-MOUNT DISTRIBUTOR FIRING ORDER; 1,2,4,3 CCW:
FORD TRACTOR OEM BALLAST RESISTOR, USED w/ FRONT MOUNT DISTRIBUTOR:
EXTERNAL 1-OHM CERAMIC RESISTOR, USED ONLY WITH THE 6V COIL & 12V CONVERSION: