Alternator Pulse

Not 100% sure but don't you ground the field to the alt. and or bracket?
I grounded the field tab closest to the pos output lug (batt) to the alternator by removing the plastic insulating washer and putting a metal washer in its place, and added a heavy wire from the alt batt lug to the big post on the battery relay. Interior lights are pulsing like a heartbeat
Any help would be most welcome!