Bill would have bent the tab and left it that way, cause that's what he did when he pulled into the neighbors driveway and it died...then wouldn't start for more than a few seconds. Bent tab, car fired up and I never looked back.
On the alt, since you swapped it, you know the connection is clean and good. I don't think your year has the stupid ring around the positive battery cable. I think that was 04+ and I think that's an engine light, not alt/battery light. Hmmmm I'd check cables, doesn't the alt cable start out at the top of the fuse box?