Carrera alternator in an SC???
 

I took my alternator out to have it tested. The auto parts store in my town said they couldn't test it, so I decided to see how much a replacement would be. Got the number off the back (Paris Rhone 911 603 120 05) and when I searched for it on this site, I got this: Alternator, New, 911/911 Turbo (1984-89), excludes 1989 C4. Now how do I tell if I have to do the regulator move or not?? Thanks, Mike.

Can anyone help?

your '81 would not have the longer 90A unit that carreras use. to use it, a carrera fan housing would be needed, or have yours machined deeper. '81 is still external regulator, carrera is internal. not a big deal. just remove the 81 regulator and don't use the black wire that used to go to the brush pack on the '81.

Thanks for the help, again. I used a lot of you help to do my trans. Cheer, Mike.

If you do use the newer internally regulated alternator, I think you'll also need a small resistor (I don't know the proper value) wired in parallel with your alternator idiot light to assist in "exciting" the Carrera alternator.

Jerry M
'78 SC

Search here under "zero-ampere RPM" and "early_s_man" to learn all about that resistor.