[fishaholic18]

Yeah, eventually electolysis will eat up a bronze thru hull, I guess that's why a lot of the manufacturers use plastic now. I would think if you just grounded it(they usually have a grounding bolt on them) to battery neg. it would work, since the battery neg. is grounded to the motor anyway. I tried to Google it but came up with nothing, I'm gonna keep looking though, I'll post if I find anything else.
I had mine grounded to battery neg. and didn't have any electrolysis in the 5 years I had my boat.