There is a fusible link at the power distribution block right under C500. Remember that this also is live all the time! The fusible link that runs into the engine harness is the suspected one.
Take a test light and see if you have power at the power distribution post. You should. Check again at the output terminal of the alternator (engine off). If you had power at the posts but not at the alternator the fusible link is out.
[This message has been edited by phonedawgz (edited 05-25-2015).]