Spoon Sports 5/31/2011Its definitely a ground problem, trace the wire from the park light backwards and look for shorts, open wires. An exposed wire directly touching ground may cause this. Also part of the internal circuitry within an electrical component can come in contact with a ground source by touching the housing of the unit itself.
You have to remember that in many situations electrical components will be case grounded. This simply means that the attaching bolts provide the system ground for the given electrical circuit.
Deposits of oil, dirt and moisture around electrical connections or terminals, can provide an excellent path so that the current flows to ground.
This may also cause a grounded circuit condition. Remember that current flows through the path of least resistance in attempting to complete its circle back to ground.
John 8/28/2011Outside chance but you may want to check this. The headlight control switch on the dash has two positions to the far left just after the Off, "O", position. These two positions on the headlight switch turn on the right side only parking lights or left side only parking lights (all the way to the left) for safety when you park in the street. Most people do not use this feature but I think it is useful. This is a carry over from Benz and it is a standard feature on almost all Benz models. After all the Crossfire is, for the most part, a Mercedes-Benz SLK320. (just better looking!)