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I dont have a wiring diagram, nor can I tell you which pins go where without one in my hand. You need a 4 or 5 pin relay. If you use a 5 pin you wont need to use the center pin. Generally the relays have a wiring diagram on them. The diadram will show that two of the pins are wired to a coil. Put one of these pines to ground and the other to the power that you would normally use to power the light when turned on. Now instead of turning on a high current draw light you will be actuating a switch using a low amount of current.

The other two pins are the heavy load carrying ones. One goes to the battery preferably with a fuse. A good place to pick up battery current in a 560SL is the large terminal block on the right inner fender wher the battery cable from the trunk terminates. The other wire goes to the light. Most of these relays are rated for 30 amps.

John Roncallo