A great website for self education is: Battery tutorial
Alkoffman explained the correct wiring. Each cell of a battery is 2 volts, wiring them in paralell maintains 12 volts, you are just doubling the size of each 2 volt cell-so to speak.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"