I have always (until this past month) started it at least weekly to maintain the charge. I let that go for about the last month, and now the engine won't turn over. If I switch the headlight switch on, there are no lights.
My guess (but not certain) is the battery is now undercharged.
If that's the problem, I need to recharge it or replace it. The manual says don't jump start the 12V battery unless your source is 12V. Dumb question - is a regular car battery 12V? Can I jump the tractor battery with a car battery? Should I buy a charger? The manual instructs to recharge at 6 to 10 Amps for 1 hour.