Im gonna install an electric fan in my 66.I dont have another alt to put in it so Im assuming that the amp rating is stock @ 35 amps.Ive got a yellow top Optima battery(dont know if that helps though).Has anyone else ran an electric fan withoutchanging the atl? And Im gonna put a cd player in it but no amp or subs yet.And yes I will be upgrading to a higher output alt in the near future.