I'm asking basic BE&E questions and not trying to insult as you may know perfectly well how to use the meter, but are you sure you are using you multimeter correctly.
You said "Check the battery drain with multimeter on amps on negative post 23.4 amp draw with everything off". Did you mean with multimeter between the cable and negative post.
You have to disconnect the cable and connect the meter in series with the load to measure current. Not parallel.
Another thought,
Most average multimeters have a mA range and a 10A range and require the user to move the leads to the correct input for the range chosen.
Could that measurement have been 23.4mA. As someone else said, 25A is a large draw on the battery with nothing turned on.
