Before I go further - Need some major help.

There is really no reason to change the wire gauge from 12 to 10 unless you have added a LOT of electrical accessories off the main fuse block. The amp guage bypass, if performed per the madelectrical instructions, eliminates all the battery charging current through those wires. Plus, you now should have two 12ga wires in parallel supplying current to the fuse box versus the single wire in the original configuration. In effect, that doubles the current capacity.