I never noticed the extra bulb in the rear. Is it just an extra parking light, or an extra break light? Anyone know the purpose?
I noticed it one evening. I backed up close to a wall, pressed the fog lamp button, and the rear lights became brighter. Since I was the only one in the car, I did not get a visual. (my Jag is set up with two fog lamp buttons - one for front and one for rear)
I say extra bulb, but might actually be a dual filiment. Works great in the evening when headlights lights are on and some brainless fool is tail-gaiting on the highway. Push the fog lamp button, and lift the gas for a nano-second - and watch his headlights back off "real quick".