With a fully charged battery and everything turned off (AC, radio, heater fan, radiator fans) you should be reading a minimum of 13 volts at the alternator at idle. Assuming your volt meter is calibrated correctly it sounds like your 140amp isn't. > Hello Everyone, > > Recently (probably ever since i got the new alternator) i have been > experiancing low voltage when i'm at an idle. The volatge at idle > has been roughly around 8-10 volts, > - Shain > #10140