Hey guys, I'm swapping an s5 turbo into my s4 turbo car, I have a pretty simple question. I need to adapt my s4 alternator/battery harness to my s5 alternator. can I just wire in the two pin plug and the power wire and I'm good to go?

 

Check the link and there is a diagram of the correct wiring for an S5 alternator. The "S" terminal on the S5 alternator needs to be fed by constant voltage. The "L" terminal (White/Black wire) stays the same between the S4 and S5 alternators as well as the "B" terminal (solid Black wire).

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/