05 XTerra SE 4x4
This will be the second time this has happened. Truck starts and runs fine for weeks. Then it won't turn over like its got a dead battery. Battery voltage 12.7-8 volts. Jump it off battery test fine alternator test fine. Drive home 5 miles next morning truck starts just fine. Another odd thing that happens during this turn the key on ACC radio comes on dash lights up, then when the headlights are turned on all that goes dead but the head lights come on. If anyone has had similar issues or can point me in the direction of a solution we'd be grateful.

Sounds like loose/corroded battery post. Remove them, clean them re-install and tighten them.