My 2012 Mazda 6 has no power

Hello, Sounds a lot like a fusible link or the main relay. Look in the underhood fuse box for this: https://www.tascaparts.com/oem-parts/mazda-fuse-c23567s99?origin=pla&gclid=EAIaIQobChMI5qWzocP52wIVl8BkCh0d9AW8EAQYAiABEgJeL_D_BwE Test across it to see if it is good. It probably is not. That is the main fuse that connects the battery to the rest of the vehicle on the positive side. If it blows, no power to anything (mostly).