Little Princess the bird has flown the coop today. This will help you figure it out www.onlinepot.org/grow/wiringlights.htm.
This particular thinggy has been set up to use both HPS and MH, meaning it is an MH ballast but with an igniter which is used on HPS bulbs. I would break everything down and then rewire it from the link above without the igniter because it can cause MH bulbs to run shorter lives. Also, it is wired for 220 volt right now and you will want to wire it for 120 if you are going to put a normal plug on it. It had some super ghetto socket on it so I threw a brand new one I had laying around in with it.
Adieu