I bought a Mercury ballast at a garage sale and want to connect a plug for a strong outside light. The type of lamp is a 400watt mercury made by Lighting Systems Incorporated. It appears it was hard wired for out-door use at a gas station. It is 120 volt and is rated for 460 watts and 4 amps. The model # is MA-400-SMH-120, serial # 47899. There are two wires that are disconnected and bare, one is black and one is yellow. Is the black the ground? I cut off a cord to a surge protector which has three colors; black, white and green. Do I hook the 2 blacks and the white to yellow and just cap the green? I was unable to find any wiring diagram for this lamp or find the company, can someone please give me some insight?