Disconnect one of the battery cables and connect an unpowered test light that has a real, small incandescent lamp inside (no batteries, no LED, no buzzer, just a simple test light with a low wattage incandescent lamp) in series between the battery cable and the post it was removed from. (Either cable works for this.)
If the test light lights or even glows faintly you have a current draw that is draining the battery.
Disconnect various components one at a time (generator, regulator, ignition coil, light switch, etc., etc., whatever it's equipped with. When the test light goes dark you have found your parasitic draw.
On the other hand, if diagnosing this sort of thing is not your strong suite there's nothing wrong with slipping a battery cable off during while it's sitting unused, or if the "Correct Police" will allow, install a battery disconnect.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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