In Reply to: 9n has a Short posted by Dean on December 22, 2019 at 19:59:32:
It'd be helpful to tell us if you have the OEM 6V/POS GRN electrical setup or gas a 12V/NEG GRN switch over job been done? Your battery is most likely the culprit and, junk. Bad/incorrect wiring may be compounding the issue. Simply charging the battery won't d squat if it won't sustain a full charge. Have it tested at your trusty local alternator/starter shop. He has the right test equipment to do so. Most auto part franchises also can test, usually for free.
A float charger, not a trickle charger, is a good investment. The DELTRAN©™ Battery Tender is a good brand and sold at Walmart for about $30. You need a good, fully charged battery to crank the engine, and cold weather will affect how effective that can be. Here is a bit of info that Bruce(VA) has posted in the past:
"If you have AC power to the tractor use a float charger. No matter what else you do, the battery must be fully charged. A float charger is helpful; not a trickle charger, but a float charger. A battery charger, even a "trickle" charger, left unattended will eventually boil out a battery. I use float chargers for two reasons: battery longevity and a sure start. Battery sulfation occurs at a specific rate at "X" temperature. Over time, sulfation reduces battery performance and eventually its effects are irreversible. Sulfation of batteries starts when specific gravity falls below 1.225 or voltage measures less than 12.4 for a 12v battery, or 6.2 for a 6 volt battery. Sulfation hardens on the battery plates reducing and eventually destroying the ability of the battery to generate current. Using a float charger significantly reduces sulfation. Your battery loses 33 percent of its power when the temperature dips below freezing, and over 50 percent of its power when the temperature falls below zero. A fully charged battery will not freeze until -76°F; however, a fully discharged battery can start to freeze at 32°F. So……keep the battery fully charged! If you have a digital volt meter, 6.03 volts on a 6 volt battery and 12.06 volts on a 12 volt battery is only a 25% charge! I use Deltran Battery Tenders®™ on all the tractors, the golf cart & '29 Ford. A bit pricey for multiple units, but they work & have in-lines fuses. All are hard wired to the vehicles."
Test the battery static. If it is weak it won't hold a charge, and most likely junk.
Get the correct wiring diagram for your system and when battery is being tested go thru the entire wiring to verify it is correct. No shortcuts. 99.98% of all starting failures is due to incorrect/mucked up wiring whether 6V/POS GRN or 12V/NEG GRN. The tractor model number and year aren't important -the front mount (side mount if late 8N), voltage system, and wiring are for any system. Get the essential manuals and wiring pictograms.