Related keywords: sparking, rotor, drive
Re: old free batteries drive pickup truck, new battery reviving technology !
Here the link of the best plan I see so far for making your own Lead-Acid Battery Desulfator.
http://www.alton-moore.net/graphics/desulfator.pdf
I want to build this circuit soon, as soon I find all the parts, now time to find free dead battery 
Read the whole article here.
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