82 FXR ...new battery as of 3 months ago, along with new volt reg. When trying to start now it drags and all juice is gone after 2-3 attempts at starting. How do I check if its the starter, stator , switch...etc? Where to start?

 

if you go to the Evo forum, there's a sticky post at the top called How to troubleshoot your charging system...great info in that post

https://www.hdforums.com/forum/evo-classic-models-84/

 

Digital voltmeter at battery...What voltage does it hold with starter engaged??
Load test that Battery...Clean all..Pos and Neg cables...Both ends.

 

the brushes in the starter are worn out and the metal tang is riding on the starters amature causing the thing to go directly to ground while cranking the motor - that will kill the battery in a very short order