As Always Michael your posts are most helpfull!

That really cleared some things up for me. I wanted to post the wiring diagram I have from my Hayes manual. I still need some help figuring out what wires need to be upgraded and how I should go about doing it. The fusible link box is in a very annoying place and appears to be welded to the frame. So I am unable to get below it to access the wires that go to the big fusible link. Is there a trick to getting in there? Also I would assume that all the connections to the fusible link box are special crimped on connections that I will be unable to use again for the larger gauge wiring.