i replaced the alt on my f**d and it charges at 15 volts. now on my 71 i replaced the alt with one off a 83 chevy k-10 wiht 350
http://www.partsamerica.com/ProductD...ype=11&ptset=A
and follow ed the instructions in this tread
http://67-72chevytrucks.com/vboard/s...d.php?t=119379
and it charges about 14.6 volts head light are brigter no more dsead battery but only thing not stock is my cd play so i got prenty of power. but if i was you i get a new gage