Something is shorting to another wire or ground directly. This may in tale unwrapping all the wire harness in the engine compartment Using an OHM meter will help if you unplug wires and see if any of them are going to ground that aren’t supposed to.
With the rectifier, it only goes in one direction, 3 wires to one, and not the other way.
Here an OHM meter will also help as you don’t need to have anything attached to power.
A wiring diagram will also help.
Bill