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Bob, It is very likely that someone in the past inadvertantly hooked the battery up negative ground, not realizing that it originally was positive ground. I've heard from other sources that they will run better with positive ground, ie. hotter spark. I can neither confirm nor deny that concept. The only concerns the electrons may have, is the polarizing of the voltage regulator. If by chance you do revert to positive ground, do repolarize the voltage regulator after hooking up the battery. Otherwise the generator will not charge the battery. I take it your generator is maintaining a full charge on the battery, otherwise you would have mentioned it. Now if by chance you have a six volt alternator installed, all of the above mentioned information could be irrelevant and should be disreguarded. With an alternator the electrons are very concerned about the polarity of your 640's grounding!!! Them electrons hate butting heads against those diodes and will do their damnedest to get through, even if it means smoking those diodes. So if you do have an alternator installed and everything is working.... leave all alone. Now for the hard dart, the only advantages to positive grounding would be: 1. To conform to existing standards the 640 was built to, if only you and no one else ever hooks up the battery you do not need to worry about this.(If I were to install your battery on a generator powered system, I would conform to positive ground, check the generator to insure it was charging properly and polarize the voltage regulator. Then you'ld be all screwed up! Still have a functioning tractor, just not what you are used to.) 2. Bragging rights to a fully functional six volt positive grounded electrical system on your tractor. 3. Provide fodder for the inquiring minds, who are not aware of the orginal positive grounding with six volt systems. HTH ATW/WA
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