Volts doesn’t measure current (draw). You would want to put an amp meter in between your positive post on the battery and one of the wires you have connected to it normally, to identify where your mystery drain is coming from. 

> On Sep 9, 2017, at 1:51 PM, Jeremy Stovin <jjstov@YAHOO.COM> wrote:
> 
> This is where I show you how much of an idiot I am but hopefully someone will be patient with me and teach me what I'm doing wrong.
> 
> So to sum up where I am. I have something drawing power from the Aux battery and currently my Aux batteries (3 wheelchair batteries) are dead. I ordered replacements, which came but I ordered the wrong ones. So in the meantime, I took one of the new 12v batteries to see if I could find the draw.
> 
> Now I was going to try a modified version of the test of disconnecting the ground and using a multimeter between the ground and neg terminal and then remove fuses, etc.
> 
> Since everything is disconnected, meaning the multiple positive connections that were attached to the positive terminal, I thought it may be easier to try just one positive wire at a time. Connect the positive and then test between the ground and neg terminal for Voltage.
> 
> Well, I tried this and it gives me the full 13v. So must be doing something wrong.
> 
> Can someone please, gently, let me in on the obvious blunder? 
> 
> Jeremy
> '87 Westy
> 
> Sent from my iPhone