Whats the process for testing ...
 

Whats the process for testing to see if an alternator and voltage regulator are operating correctly and what tools are needed?

It's a 1978 911sc.

Thanks

Try a volt meter connected across the battery terminals - should be between 13 and 14 volts. Anything less than 13 volts means you have some issue - could be regulator, alternator, or maybe the battery itself.

..and if it is in the original config you have an external regulator which meands you can pop one in without much hassle. If it has been updated then the regulator and Alternator are built in to one unit. a Alternator refurb should also includ the replacement of the regulator/brush assm.

Alternator test........
 

Red,

There are too many variables when you test your alternator/VR in situ. Like previously mentioned it could be affected by the battery's condition too. So to avoid any guess work, I simply pull it out and have it bench tested. If you don't have the apparatus to do the test, simply have it done by your local alternator/starter repair shop. The test is so simple and quick that it takes less than a minute to test the alternator or starter. Your local shop might not even charge you for the test. HTH.

Tony

good advise. advance will check it for free. you most likely want around 14.2 to 14.5 volts.
go here and read about batteries and charging voltage. make sure all major connections are clean, positive and grounds.

http://www.landiss.com/battery.htm