The contact owns a 2007 Ford Mustang. The contact stated that upon entering the vehicle, there was an abnormal clicking sound coming from an unknown location with the vehicle turned off. The contact became aware that the battery was completely drained. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who determined that electrical components were draining the battery while the vehicle was turned off. The vehicle was not repaired. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 30,000.