Well as usual I got carried away and didn't check last night, sorry Ralph. I have a fresh 160amp durango alternator and new cables. I know at idle with some things on (low heat, CB, stereo) voltage looks fine at regular idle speeds. My idle is kinda screwed up right now, but I can do some more checking later in terms of what is turned on or off. The 160amp durango alt has a 7groove pulley instead of a 6, but I think if I remember right it is the same diameter or pretty close to stock. I didn't have any issues so I didn't care I guess.