The battery on my 2002 4.6 went flat after being left over night. On coming to the car in the morning all 4 indicators were on which i thought was strange charged battery set windows etc turned to start engine turns over but will not fire at all not even a cough? tried leaving car with battery disconnected all day and fully charged battery retried again this evening but it still turns over but will not start. a few days ago i came to the car in the evening and all the indicators were on opened doors and they went off really stuck now any ideas?