Update: The positive cable was touching the ground(I think it's ground). On my old starter there was a narrow nut that was on the post as a spacer before the positive cable was put on. My new starter didn't have that nut so the cable was too close to the ground wire. I just took the spacer nut off the old starter & put it on the post on my new starter.

I have more to add about my experience for anyone else doing this for the first time, but that will have to be in the next couple of days because right now I'm beat!