A sealed lead acid battery needs a higher voltage than its nominal output to recharge. This higher voltage comes from the alternator of the car giving the jump. If you reversed the connections you would be putting a neagative voltage on the bettery being jumped assuming that it would even survive the connection.Hi,
I am having trouble understanding why Connecting the Red cable to + and + on both cars is essential.Why can't i connect + to - , I mean if anything i will be aiding the series connection of batteries won't I. Please help me understand
What he said!The + of the good battery connects to the + of the bad battery connetcts to the + of the disabled vehicle's regulator connects to the + of everything else in the circuit.
We call this "parallel" because the + points are all electrically common.
Have a quick look here: http://www.allaboutcircuits.com/vol_1/chpt_5/1.html
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by Jake Hertz