Rectifier failed or ...

Over the last week or 2 i picked up that early warning hesitation when starting my gs at 6am, as the battery is about 2 years old let me change it. Bikes starts beautifull all good, 3 days later click click like a flat battery. Goodman Dennis jump starts it, checks out charging , nothing,. Regulator  guilty or any other thoughts. Need one quick in ct
Thks