Voltage regulator

I also ran a pig tail ground wire from behind my voltage regulator to the fire wall and i sanded all the paint off behind the voltage regulator to make sure it has a good ground, should i ground the altenator from the altenator to behind the voltage regulator as well? its just a standard 60 amp altenator from napa and it says they are grounded thru the case but i dont know how well they ground thru the case?