How do you rewire an alternater from external volt reg to an internal one on my 65 elky with idiot lite? thanks

http://www.geocities.com/diels12000/Alternator.html

Check the "Tech Ref" part of this web site, like so:

http://www.chevelles.com/techref/ftecref14.html

That tech reference that I assume is authored by Wes Vann, is one of the best pieces of tech ever written for modifying a Chevelle/ElCamino.