I've been having some battery issues lately and would like to know what the normal voltage output one should see from the alternator when traveling down the road. Mine reads from a high of 14.1 volts to around 13.8 when moving down the road and drops to 13.2 at an idle at stop lights etc. This is with lights, radio and fan on. Is this normal or is the alternator not putting out the right voltage? The reason I am asking is my truck after doing several quick start/stops while moving the trailer around the yard and out of the carport etc., the next day sometimes it won't start without jumping the batteries. The batteries are only 7 months old.
Thanks,
Griz
Thanks,
Griz