My 04 dodge intrepid SE is very all over the place. Sometimes when we try to start it, it'll start up just fine and it drives perfectly. Other times the car will start, but things like the windows, AC fans, heat and turn signals don't work, but the car still drives well. Other times it'll just click as if the battery is dead and won't start, but we test it and the battery is still fully charged. We've checked the relays and fuses and they all look fine...help!