I have 02 chevy express Thomas, I put in newagm 900 cranking ,I just found the 2nd battery under the bus. I have a drain so I unhooked the 2nd battery just left the one under the hood hooked up, it's showing 14.2 volts on dash guage when started is that OK? New this bus thing. I assume I dnt need the 2nd battery everything I'm using is working fine????? So many wires trying to eliminate it's a work in progress,bus runs drives great only problem was battery dead next morning,hoping unhooking 2nd battery will fix that problem,any ideas and help appreciated!!