from what ive gathered the 70A 86-88 is direct bolt in, no rewiring..

but what does it take to swap FD alt? anyone have a guide for switching the circuit from an S to an R type? all i know is you move the alt wire to a constant battery source..

(i know there was an FD ready to install for sale by sumone, but he discontinued)

 

There's an active thread about this right now:

https://www.rx7club.com/1st-generation-specific-1979-1985-18/want-upgrade-my-alternator-468784/

I used this page to help me:

http://www.rx7.org/public/altxref.html

Rich