December 5, 2010I have a 1999 F350 Diesel 4x4. It has 443K on it. I let it set for a week and the batteries were completely dead (batteries less than year old). Charged them started the truck and all is well. Let the truck set another 5 days. This time the batteries would turn the truck over but not fast enough to start (25degrees out too). Went back out 3 hours later and the barreries were 99.9% dead. All the truck was going was the fues box was making noise. Sounded like a barking or duck call or somthing. Not really a clicking. I pulled the relays and that did nothing. Turned the light switch on and it stopped. Then 10 seconds later started up again.