Well, my '59 540 is sitting outside year round...(unfortunately). It's 6V, never plugged in, and starts year round. I live in Ontario, not like it's warm year round. The only time I had starting issues was right before the engine needed rebuilding. In the 16 years I've had it, I've only replaced the battery once. (Would have to check, but, I think the current battery is 6 or 7 years old.) I will admit, my tractor does get used almost every day, but, it gets more of the typical farm maintenance, if it ain't broke, don't fix it.(other than oil changes, i try to keep them regular) Keeping your tractor plugged in does more than assist starting, it helps to warm the engine, getting the oil moving faster, and reduce startup damage. I used to have a magnetic heater on the tranny housing, til I finally seemed to get rid of all the water contaminated oil. I'm a firm believer that there really is no need or reason to convert to 12V, other than personal preference. Most of the ones I've dealt with were more headache than anything, because for a long time, every one was done differently. At least now adays, there seems to be some consistency with the conversions. Mark
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