91blackmustanggt

I recently upgraded to a 200amp 3g alternator with the 4 gauge wire and fuse running from the alternator to the battery. It has worked great up until this weekend. I have a small crank pulley installed and it was charginggreat with idle set at 750rpms but now its acting like the old 2g again. I washedthe engine bay with the alternator coveredbeforeit started acting up but I think the fuse gotwet andpossibly blew.Would it actlike a 2g if the fuse was blown?