Well all, new one to me. Drove all over the place today with several stops. Got home and parked in the driveway to empty the truck. Got back in and it was hard to start. Cranked over ran poorly for a bit then died. After several tries I got it running and parked it in the grattage - knowing I would go back out and start it up again. After an hour or so I went out and attempted to start her up. Cranked over a couple times and then went completely dead. I mean completely - nothing worked. As if mo battery was in the truck. Popped the hood, checked the battery (over 12 volts). Disconnected the terminals to check them out and all was clean and looked great. Reconnected the battery, went to check the connections by looking in the driver's side and my security light was flashing. Turned on the ignition and fuel pump primed, dash board lights were on, windows and locks worked, stereo worked and all exterior lights worked. Went to crank her over - she starts to crank (half a second) then all is dead again - like no battery was installed. Tried a different battery ($%its and giggles). Exact same thing, Everything worked until I tried to crank it over. I'm at a lost. Thoughts/direction?