I have a choice of displaying the temp or milage or odometer. I always chose temp and fog lights on so the fog light icon is always on. My question is that most of the time when I start the charger the temp is displayed and when I turn my lights on the fog light icon is on. But every once in a while when I start the charger the milage appears instead of the temp display and when I go to turn the lights on my fog lights arent on till I manually push the button on. Can anyone shed some light on this ?