I have a 2004 Nissan Titan 5.6L and just replaced battery with a brand new one. Every morning battery is completely dead. No lights were left on and keys were taken out. No reason for being dead. With a charge it starts right up. Something is draining the battery. Need some help to know what it could be. Went through fuses and cleaned terminals. Still the same. Dead every morning. Anybody know what that could be?