To check for a "Battery Draw/Drain" is simple. Disconnect the NEG battery cable and connect a test light to the Neg battery "post" then connect the probe end of the test light to the Neg "cable". Make sure everything is off, doors closed, hood light bulb removed, key off and removed. If the test light is lit...you have a draw. If the test light is off...you have no draw.
To find a draw start by pulling fuses one at a time till the light goes out, then you have found the circuit the draw is coming from.
Remember if the doors are open the light will stay lit because of the interior lights.