I have a 2007 5.9L and the past couple of days it's acted like the battery was starting to go. It would start to turn over then stop then keep turning over and fire up. Went back to get in it today after driving it yesterday and it won't do anything. I tried jumping it off with jumper cables and also a jump box but it wouldn't even start to turn over. I checked all fuses and none are blown. I've checked the grounds on the side of the block and the connections on the batteries. Did a load test on the batteries to make sure they were still good. All of that checked out fine, what's getting me is if you turn the key backwards then all of the accessories (radio, pillar gauges) all come on and work properly. If you turn the key forward like you're going to start it, the interior lights go dim or cut off, all of the dash lights go off, the relays behind the main gauge cluster starts flicking back and forth and it doesn't even start to turn over and acts like the batteries are dead but everything works perfectly with the key turn backwards. I pulled the grounds off of the battery to try to reset the computer and the wcm and also pulled the fuses for the wcm and let it sit for 10 minutes before hooking it back up with the same results. I'm completely stumped and would appreciate any input anyone has to try to fix this problem.