Stereo stand-by draw will drain most batteries in two to three weeks.  I keep a "smart" trickle charger on all my stored cars (don't ask how many), or they won't start after sitting that long, and I've killed the battery after a few times.

Do you have the right charger for those batteries? They are AGM type, and require a special charging profile.  I use the CETEK 56-158.  You should be able to charge all three in parallel properly with this unit.

Be sure to do the leak down test I mentioned earlier too. 

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dennis Jowell
Sent: Friday, May 08, 2015 4:02 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: [SPAM] Re: Aux battery hookup

I've got to see if my stereo face plate does come off, then I'll keep checking the battery for constant draw down. So far the 3 -22amp batteries  are at 12.3 after charging for 24 hrs. 

Dennis Jowell
Scotch Hollow Farm
Newbury, Vermont 

> On May 8, 2015, at 11:17 AM, Edward Maglott <emaglott3@GMAIL.COM> wrote:
> 
> I also had enough draw from my stereo that it was draining my aux batt 
> over time.  noticeable if the van sat for a couple weeks.  I never 
> checked with the faceplate off because I definitely do not want to 
> have to fuss with that every time I park the van.  The stereo does 
> have a remote.  I wanted to be able to use the stereo with the key 
> off, such as when camping so I connected the wire that is supposed to 
> go to the key circuit directly to the aux battery circuit.  I changed 
> that to run through an extra rear defogger switch I have in the 
> instrument cluster in one of the blank spots.
> 
> On Thu, May 7, 2015 at 12:54 PM, Richard Smith <richard_smith@gnwc.ca>
> wrote:
> 
>> My brother has this problem with his: the faceplate on his stereo has 
>> a significant draw (electro luminescent, not LED/LCD), and whoever 
>> installed it didn¹t use the ³two 12v leads, one of which is switched 
>> with the key² option that most stereos permit. So, what he has to do 
>> is remember to remove the face of the stereo every time he gets out 
>> of the van. My van is wired so the stereo is switched with the key 
>> (but gets power from the system when the key is off to hold the 
>> station memory and clock), and so I don¹t have this problem.
>> 
>> 
>>> On 2015-05-07, 8:30 AM, "Neil N" <musomuso@GMAIL.COM> wrote:
>>> 
>>> I agree with stereo unit draw.
>>> 
>>> 1 Amp / 24 = .042
>>> So:
>>> 0.042 Amp per hour?
>>> 
>>> 
>>>> On 5/7/15, Dennis Jowell <dennisjowell@gmail.com> wrote:
>>>> .... all power to the
>>>> fridge, solar panel setup are not connected yet. The problem that 
>>>> is happening is the batteries are being depleted of power 
>>>> continuously. The first 24 hrs it dropped from 12.9 to 11.9 amps.
>>> 
>>> 
>>> --
>>> Neil n
>>> 
>>> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>>> 
>>> 1988 Westy Images 
>>> <https://picasaweb.google.com/musomuso/New1988Westy>
>>> 
>>> 1981 Westfalia "Jaco" Images, technical 
>>> <http://tubaneil.googlepages.com/
>>> 
>>> 
>>> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
>>> 
>>