What Happened?

I just went out to pull my 65 Barracuda Formula S in the garage to install a new set of leaf springs. I have been busy for the last 2 weeks so the car has sit outside. Before that I rebuilt the front suspension and replaced the master cylinder. The car started on its own and ran ok. Today it is dead. I hooked up a charger thinking I left a light on or something and the battery shows a full charge. I have no lights no horn or anything. Tell me what to check, I would like to get it in the garage to start the rear springs before the rain starts on tuesday evening.
Thanks for your help.

Pull your battery cables off and clean the terminals and inside the cable ends, and you may find that oxidation was causing your problem.

The conections at the staarter and block ground also could be loose.

Gotta be something like that; this ain't rocket surgery...:banghead: