rincon battery drain

while running the winch power cables, I charged up the battery. it was quite low at 40% charge. after it was charged, batt voltage was 12.5 v
I then put a volt meter between the neg cable and the batt neg post. I got 11.8 v. my mullti meter is on the fritz so don,t know how many milli amps.
yes everything is off as far as I know. bad rectifier???? clock????