The voltage is 11.5 at idle no load and with the head lights on it will either be below 10 or above 17 .depending on which alt was in it . i also thought the belt might be to tight,so ihad my buddy who is a tech look at it and he said the belt was fine .he also said that i might have a short in the wire that goes from the alt to the fuse box or the box it self might have a short in it.