When I turn the key to crank over the engine there's a click and all power is lost. No lights, radio etc. It has a brand new alternator, starter and I just tested the battery yesterday and it's good. I gave it a full charge, put it in and turned the key click no power... Any one have any ideas?

 

Welcome to ZDriver!

Sounds like a classic loose battery cable. Check terminals, battery cables, grounds, and main connections. Make sure all are tight and free of corrosion.

 

Already did that, every connection is tight and free of corrosion. I'm thinking a short somewhere? I forgot to mention the first time this happened when it was raining out.

 

It's unlikely, but possible that during the install of the new parts that you accidentally caused a short, and melted a fusible link. Fusible Links don't always burn completely through, and can "look" intact, when actually the wire inside has melted. So check your links with a multimeter.