yeah, with zero load, and a recent charge say, from a long drive and instant volt check, odd things can show up on the meter. check again with the headlights on. that'll show the true volts at the battery. with the headlights on, less than 12v or so and the battery is not any good.
most surface charge should be 13.8v

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!