Can anyone explain what the lower wire on the two pin plug goes to on a first gen 12a alternator?

 

Top terminal, Black/white to ignition switch. Bottom terminal, White/black to dash warning light.

 

awesome thanks...

 

would this be that same on the third gen? Can i replace my 60 amp first gen with a 100 amp 3 gen alt?

 

Yes, you can

You will need my pulley to make it work though

link:https://www.rx7club.com/1st-generation-rx-7-1979-1985-parts-101/brand-new-dual-belt-pulley-fd3s-100amp-alternator-upgrade-860871/

 

You can replace it with a FD alternator. I used the pulley from Japan2LA to put one on my 84. Works great. The wiring is a little different. FD still has two terminals in the plug but not in a T. Bottom terminal still goes to warning light (Black/white wire), but top wire needs constant 12V, not switched 12v (White/black wire). Easy way is to leave the White/black terminal (top) on the plug empty and connect a wire from the top terminal on the alternator to the large White/red wire where it connects to the alternator. I'll get a picture if you need it.

 

ok thanks guys

 

If you have the time i would love a pic and how to for my 1st gen.