Because the electric fan I am going to be using in our Gremlin has a 30 amp draw and I plan on other upgrades like a stereo and maybe a upgraded ignition, I knew my 40 amp alternator wasn't going to be able to keep up so I have upgraded to a 3rd generation ( 3G ) 130 amp alternator. If anyone is interested in doing this conversion too, PM or e-mail me and I can set you up with an alternator and wiring. It can also be installed with a single pulley or as pictured with a double pulley. I see several posts here about people adding a second alternator. This setup makes more power than 2 factory AMC alternators.