Turn the key to start, solenoid clicks once then all is dead.

Replace your battery.

Brand new battery, less than 2 weeks old. even after sitting for a few days now, still maintains 12.63 Volts. When I turned the key a few minutes ago. All lights on and bells sound, turn to start and click, then no electrical power. Discounted the battery for 3 minutes, hooked back up, battery still checked at 12.58 volts, turned key, click, the dead.

If you replaced the battery and it is holding a charge, then I would also suspect the main cables next. Any obvious corrosion on either end of both cables? The"click" is telling you that the starter is not seeing enough energy to crank the engine even though the battery is holding a sufficient charge.