Going through the batterys is asking for trouble, you must never have seen a battery explode. Well, you don't actually see it, just hear a very loud boom & there is plasic & acid everywhere. My hearing did come back in a few seconds. (My battery just developed a short, didn't do anything wrong...) If that doesn't worry you, you are putting a heck of a strain on your whole electrical system, as gauges, lights, regulator, points, etc. all get double the volts it should be getting, and none of these parts deal with it well. I'd rather pull a tractor than try to jump it with a 12v battery, but if you are careful to only energize the starter itself it does work without harming the starter. Only hold down the starter switch about 1/2 as long as you normally would tho, don't grind away with 12 volts on a non-starting engine. A starter is designed to take a lot of electrical power for short time periods, so the 12 volts for a shorter time is no harder on it that 6 volts for a longer time... --->Paul
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