If he hooks two 12 volt batteries in paralell he doubles the avaiable cranking amps while voltage stays the same (12 volts), if he hooks two in series, he doubles the voltage (12 + 12 = 24) butttttttt the cranking amps is no greater then that of the smaller batterys CCA.
If its a 12 volt truck I WOULD NOT recommend he hook two 12's in series, it will blow bulbs and do other damage.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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