changed battery connector and no power

Hello, you created a bit of a power surge when you connected the positive cable without removing the negative one. There is an important order: Attach positive cable first, negative last. When you're removing cables, remove negative first, positive last. You likely caused a power surge that did indeed blow a fuse. You just have to find which one. A large one likely. But it could have also damaged other components. It'll take some hands on troubleshooting to figure it out. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops