Super73,

I have seen some alternators that have the plug identified by both R&F and 1&2. The key is the orientation of the tabs.

If your alternator case indicates R&F, the tabs should look like this... II ...

This means a external regulator IS required.

My idea would be to find a 'SI' alternator and use your existing one as a core for the new purchase.

A single wire unit would be simpler yet, and work just as well.

The fewer wires and firewall clutter means a nicer looking engine compartment.

Your wiring recipe for the internally regulated alternator (SI) is perfect.

If your tab orientation is truly this way, II , it MUST use a external (firewall mounted) regulator, UGH!

Stuart