for $400 you wont find a new alt that actually does what the company claims,unless its a 200 amp .most of the 250 amp alts and bigger are well over the $400 range new .yu may find one on
ebay ,but i can tell you from experience its not worth the money or risk. powermaster , dc power ,mechman ,singer ,ohio generators,iraggi , and excessive ,will all be over $400 for a new alt thats over 200 amps.