Battery voltage question

67Dart273 said
It could be that the alternator has enough load, and is not a real high output unit, that could be considered normal. If you can set it up at home so you are getting the 13, and without changing anything at all, move the voltmeter to the alternator output stud and see what that says.

I actually did that and each time it was (approximately ) a .40 volt gain on the alternator stud..... So for example..if it was 13 volts on the battery at low idle ( 1000 rpm) no accessories on, than i move to the alternator stud .. volts were 13.40 volts.
Thanks