I am having the same issues. Idiot lights come on and change every time I disconnect the battery. The reason I disconnect the battery is because they are on even if the car is off. The radiator fan runs real fast all the time when the car is running, gauges are dead! I too have tried things, I have a 2006 roadster. I replaced the battery as its was the original, the voltage regulator was checked and good. My mechanic took the dash apart and found nothing, he got a code 0800306, something to do with "instrument panel", we can not find any thing on this. I am going to give my local dealership a shot at the code and hope they have the answer. I doubt it but where do we go from here???