Loadedbruh

Hello I think it’s the alternator but before I waste my money on fixing it can someone else help me? The day before yesterday my radio was going in and out but car was driving fine then yesterday car was perfect went to get five guys then I go back to the car lights were on my dash and all but I tried to start it then click everything went black and lights woudlnt come back on the dash. I bought a brand new battery and same thing lights came on dash and then I try to start it click and then that battery is dead now. The tow truck brought a jumper pack and it started but when he takes the positive off it dies instantly. Could this be my positive terminal? Or alternator?

Hello idk if you’ll ever see this but im having the same issue right now. Are you able to help me fix it? I don’t understand what you mean by the fuse by the positive terminal