Expedition cuts all electrical, will not start. Help!

[bosozoku]

Hello all.
So this morning I hop in my garaged 1998 Ford Expedition 4x4 4.6l 155k miles, turn it over and it starts up normally, but sounds a little 'off', so I shut it off and go to restart it and 'click', all power goes out (lights, locks, everything, it's like the battery is disconnected). I break out the multimeter and the battery check out fine, so I go to the big fuse block and power is on both sides.
I go inside the house and back out to the garage about 10 minutes later and the lights are on and everything looks normal again. I go to turn it over and 'click' all power goes out again. I wait for a few minutes, the lights click back on and I hook my code reader up and there are no codes, there appears to be full power, so I try to turn it over again, and 'click' the power is out again.
The 'anti-theft' light isn't on and I cannot figure out what is going on.
Any help would be appreciated!
Thank you.

 

[Racenut]

Clean your battery terminal conections and then also check the conections down at the starter. It sounds like either a coroded conection or a loose one.

 

[bosozoku]

Alright, I admit I was a bit sleepy this morning and freaking out. After posting my message, I went back out and found a loose ground wire. Problem solved and off to work I went. Thanks for the advice, you were right on anyway.