Ex RNLI Mariner 40 outboard- is it inversion proof?
A rectifier changes your AC current (coming from your charge coil under flywheel) into DC. The DC current coming out of the rectifier is rough, suitable for battery charging, this current is usually tidied up by a regulator.
Some rectifiers are regulated so the output is clean and can be used for more delicate electronics etc.
I don't know what type you have there, I suspect its unregulated.
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.