i have an issue in my 2002 porsche 911 turbo. My air conditioning, power door lock, rear defroster and moonroof are all not working. I am not sure if it happened after I changed the car battery from a AAA 800amp to a Bosch 850amp or a fews later after we had two Fosgate amps install for new stereo system. Does anyone seem to know what would cause all of these to go out together? The fuse for the air condition keeps blowing as soon as I put it in it's spot (row C, Column 7). It works if I use a 15amp fuse or higher. We try to figure it out and some one unsync the keyless entry system for the key and now the key doesn't work. what a nightmare?

 

Your amps may be drawing too much amperage. Perhaps needs to be put on a separate circuit. Thinking you need about 10-15 amps ( into two Ohms) just to push that stereo system. Check the manual and see what they need.. Good luck!!