I'm installing a RX7 first gen internal regulated alternator in my RX3. On the RX7 alternator there are 2 prongs for electrical connections other than the +12V hot terminal. The prongs are in a T pattern. I understand one is for an ingition +12 V and the other is for a dash idiot light and a carb heater.

I can't find info an which is which? Anybody help?

 

The terminal at the top of the T should go to a switched 12v + source. Bottom of the T goes to the dash warning light.
Diagrams and more info ....http://www.rx7.org/public/altxref.html

 

Thanks

 

https://www.rx7club.com/1st-generation-specific-1979-1985-18/s4-t2-alternator-upgrade-878435/

On the front page. Search mate!