I currently replaced the batteries in my 03. I drive it about 2-3 times a week. I recently went to get into my truck and it was so dead that I couldn't even unlock it with the remote. Could it be the alternator problem? The truck is mostly stock except for an intake. I have had the truck for about a year now and these are the first issues I am having with the truck. This is my first diesel so my diesel knowledge is farily limited. Any help would be greatly appreciated.