This fuse was in fact the culprit. Thank you again, pgamboa, for I was only able to do this mod with your help via videos/pictures in conjunction with some of my own research, plus another guy on youtube. I would suggest to anyone else wanting this mod to purchase the plug n play harnesses from you as soon as they order their mirrors! I was able to use the extra wiring and “pins” that came with the aftermarket mirrors after dismantling their connectors but it was a little time consuming.