Battery drain issue

You really ought to pull one lead off your battery and put an ammeter in series with everything off. If it's pulling current start pulling fuses one at a time to find out where the draw is from. If that doesn't work, pull the wires off the alternator to check for a bad diode draw. It's got to be going somewhere! Your ammeter should show zero(0) amps unless you have an aftermarket radio which may pull microamps to save memory in which case you can ignore it.