In Reply to: munderloh posted by steve on October 23, 2020 at 10:22:29:
Does the tractor have an alternator? If so, most likely it is a Negative ground.
If it has the standard ignition setup, changing the polarity should not harm anything. If it has electronic ignition, likely that would be destroyed if connected wrong.
If the key was left on most likely your points will require replacement.
Without a meter or a test light and some charge in the battery, Kevin has given you the way.