My battery is draining.

Chevrolet Silverado 1500 2009 1500 V8 5.3L 265746 miles
Well it all started one day when i went to the store for lunch turned off my truck went in then came back out, went to start my truck the dash came on as normal, then when i went to start it i turned the key and lost all power everything was gone i coulndt even us my remote to lock/unlock. I tried boosting it and nothing you could just hear the starter click. Eventually i got it towed home took out the battery charged it put it back in and it worked. Then it sat over night about 12hrs and the same thing lost all power. I have checked my alternator its good checked the fuses the seem good. But maybe a bad relay is causing it to drain?? Im trying to follow wires to see maybe there is something shorting out? The previous owner had what looks like old stereo wires and a remote starter would those cause it to drain the battery?
Im lost trying to figure this out.
Fath from Canada 4 years ago  
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