Just found out why my rear fog lights would't light up even though the dash switch would light up. After pulling the connector off the drivers side tail light the pin on the circuit board looked black, which was a small rubber insulater which blocked the path to the fog lights. Removed the piece of rubber and now they work. This must have been done at the factory to complie whith some state laws. A small trick that may be well known among the 240 group, but a great find for myself.