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I replaced my battery a few days ago. this morning with a multimeter (car was sitting overnight), i saw that the volts on my battery was roughly at 12.54 which is nice . (car not walking) checked the bat terminal on my alternator, roughly the same (also nice ) started the car, the bat terminal reported 14.6 and my battery was also reporting roughly the same, after a few minutes, i began opening headlights, defrost, wipers, heaters . .. the car battery voltage began to drop 13 and lower , the second i provided some acceleration, the battery clearly went back to 13.99 to almost 14.2 all that time, the alternator was still registering 14.4 to 14.6 volts to me, this seems to be working as designed. in an idle state with no gas and all bells walking, i bel it is normal to be hovering at 12.5. (again idle, with no gas what is so ever) my mechanic insists it is not normal. well, you guys are the best! thanks for the quick response. i have one more question (sorry for the multiples), if i unhook the negative cable on my battery (while e thing is shutoff. no lights, no radio, no wipers, nothing), get a multimeter and test the voltage between the negative cable and the negative battery terminal, am i coorect to bel that anything below 12 volts means that no parasite sucking power exists?

Sounds normal to me. i have been working on cars for over 30 years .