Thanks for the compliment King David !
I see the post and my knee jerk reaction is a faulty ground on the negative battery cable.
Hook up an ohm meter between the negative battery post and a good clean part on the engine.
You should see close to 0 ohms. Wiggle the negative battery cable real good and see if you see any increase in resistance.

Measure the battery volts with everything off : 11.9 - 12.5 volts
Now measure with car running : 13.8 - 14.5

To check for battery drain, hook up your meter on ma scale between the negative cable clamp and the battery negative post.
***** DO NOT OPEN ANY DOORS, TURN ON IGNITION OR TRY TO START THE CAR - YOU WILL BLOW THE METER'S FUSE ****************
You should see somewhere in the 20 - 50 Ma range, if higher, start plucking fuses one at a time to see what area is causing the problem.