i have a used 220 amp alt custom made its about 6 months old held at 13.8 volts when i took it out 3 month ago . changed to a xs alt with adjustable voltage reg. give you a good deal came out of a 95 s10 v-6 was told but powermaster it will fit from 94-99 v-6 and v-8 chevys tahoe,astro van ,camaro ,s-10 ,s-15,firebird