Question on alternators
 

I have a 73 911 and not sure which years will work or won’t and would like to know the reasons ? Thank you

Internal regulator v external regulator is one difference, next is the size of the shaft that the fan and pulley attach to.

http://forums.pelicanparts.com/uploa...1583036449.JPG

Casey,

There’s that chart again I posted in my for sale ad! Thanks to Tom Butler here for creating that.

I also thought of the internal vs external voltage regulator issue after we spoke. Here’s a link to a tech bulletin (see page 116) with some details on the upgrade to the internal regulator.

https://drive.google.com/file/d/0B7Bo-8bAu9G9VlZDY04xMzdOSEk/view?usp=drivesdk

Need to find out if your setup is older external regulator or has been updated to internal style already mounted within alternator