alternator questions

[jdm s13 tuner]

i got an sr20 non turbo in my 240 and am currently using the ka alternator on it but didnt swap the pulley i was wondering if the size of the pulley will affect the electrical output. i didnt swap it because the sr five rib pulley rubbed against my ka alternator so i decided just to use the ka pulley and run a four rib belt all the way around.

[xero1]

it shouldn't affect the charging voltage much. the smaller the pulley the more the amps the alternator will charge. is the na sr20 alternator pulley the same size as the ka?

[jdm s13 tuner]

the pulley on the sr was bigger then my ka