hello!
i have a rx8 with cosmo engine ! i need to upgrade alternator to a 160 amp fd alternator!
1.the rx8 and fd alternator is same housing and pulleys...that ok
2.that is my mistake the rx8 control the alternator charging in the pcm! and the charging ligth,in spedometer

if i install the new fd alternator 160 amp in the wiring the s terminal i run a wire to fuse block .that ok

but the L terminal is the trouble i think i dont know i cant hook to the oem rx8 cable to new alt!
or i cant made my proper L cable to the 160 amp alt

 

The reason that the FD alternator uses the same housing and pulley as the RX8 because it is the same alternator. Also, where did you find that it is a 160A unit? I was only able to find mentions of it being 100-110A.

 

the fd and rx8 alternator housing and pulley is same but the rx8 alternator control the voltage with pcm. that is the problem

Posted From RX8Club.com Android App

 

The L terminal is for the dash voltage gauge, which RX8s don't have. You should be able to leave the L terminal completely disconnected and be fine.