Losing power issues

So I recently had to get my transmission replaced after doing so I was called by the transmission shop and was told my alternator was bad and that it was blowing fuses and killing all power to the truck and can’t move it out of park so they changed some fuses and it would regain power but the alternator was no longer charging the battery and when they take the alternator fuse out of the fuse box it wouldn’t blow the fuses to kill the power so I took it home and changed the alternator myself since the shop told me the alternator was definitely my issue well after changing the alternator I still had the same issues it crunk up one time blew a fuse and when I turned the truck off and tried to crank again all power was lost and couldn’t take it back out of park does anyone have any clue what could be going on I’m at a lost ???