I'm not Wayne, but since I directed you toward the cheater plug solution, perhaps I can give you some other options, too. Please keep in mind that your BFD was humming, because it was grounded "twice," if you will - once through its 3-prong plug and once through the interconnect. The odds are...
You're getting a ground loop. Put a cheater plug on the BFD. A cheater plug coverts a 3-prong power cord into a 2-prong. You can get one at Home Depot, etc.