Won’t start

What is your question?

I put battery charger on high nothing happens the dash lights come on then when Ranking they go out no hum, no buzz, nothing tested the battery it is full 12 volts. Replaced the alternator 3 months ago. Battery is approximately the same age.if the car sits 6 hours it longer it won’t start. Sounds like a short in the system possibly which drains the battery. If I take a battery terminal off at night the car will start in the morning.