Burnt alternator wire

[transit360]

The main ground cable to the back of my alternator looks like it's
gotten really hot at one point and burnt. I had a malfunctioning
voltage regulator which may have done this, plus the connection was
badly corroded.
How should I replace this wire? It looks at least a 2 gauge. I
would replace the whole length, but it goes all the way back to the
batteries and it's about 12 ft long and a bear to pull out. Would it
be safe to buy some heavy duty butt connectors and new eyelet and cut
off and replace the foot's length of burnt wire?

Steve
2 '98 QBRE Partybuses