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No! When they are hooked in series (plus of one to negative of the next) they double the VOLTAGE but leave the amps the same (as the weakest one, by the way). It is a parrellel hookup (all negatives hooked together, all positives hooked together) that leaves the voltage the same, but multiplies the amps (and requires ever bigger cables...). Now, the guy asked how to jump it. Ah, there is a problem! It seems the tractor is a 12v system, and needs a lot of amps. So they origionally used 2 6v in series. If you want to jump it with an addtional 12v battery, then hook it up to the starter (match whatever bat terminal is going to there, most likely positive) and hook the other cable to a frame member. If you want to jump it with a 6v battery - you can't, really. You would need to 'make' a 12v battery out of 2 more 6v batteries in series and again hook them up as above. Now, if you have problems with the batteries holding charge, it is always strongly recommended that you replace both at the same time, same brand. When used in series, you really only get the power of the _weakest_ battery, and again only charge up to the capacity of the weakest one. That is why, with modern battery options, a lot of folks replace the series 6v with one good 12v battery that has the same cca as the combined 6v batteries. Gets rid of a lot of the headaches. --->Paul
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