I'm wiring up the trailer lights on an M416 trailer, but I don't really know how these military lights are supposed to be wired. The left and right lights are identical, with a split lens. Each one has a "Big Red Eye" on the top and a rectangular lens on the bottom. When you take the lens off the body of the housing it has three bulbs in it. Two of the bulbs are on the top of a sheet metal shield in back of the "Big Red Eye" and there is another bulb on the bottom of the sheet metal shield in back of the bottom rectangular lens. In the picture I have labeled these bulbs as A, B, C. Each of the three sockets has one wire going to one contact in the bottom of the socket. What is the purpose of the split lens? Which bulb is for running lights, which for turn signals and brakes, and what is the other one for? Above the right light there is another smaller diameter light with a rectangular lens. What is this one for? Thanks for your help!