Not a Mopar But Ford Electrical Question

No there isn't much there. Starter is Brand New. When hooking up the Negative Cable there was sparks, nothing big like when you hook up jumper cables but definitely sparking. All the wires are Removed right now. I took pictures of everything and wrote down a diagram of how all the wires are all hooked up and just gonna rewire everything, hell the wiring is almost 50 yrs old in this thing LOL. Thanks for all the input fellows, can't wait till haying season is over and I can start working on my Barracuda and Dart again.