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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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