Originally Posted by hellosailor
A battery that has rested should read around 12.6 when fresh. "12" would be more than half dead. A charger (or alternator) typically would put out 13.8-14.4 in bulk mode, and "13" would be way too low.
thanks for this. I have checked my battery readings and with the engine off I got a 13 and no change registered with the engine on under load!