Auxiliary batteries won't hold charge

[Lena Abbott]

Hi I'm a new member and my husband and I have had a 26' Land Yacht for 3 years. We haven't done much traveling with it but when we do we really enjoy it. I'm hoping that someone out there can help us with a problem we've had for along time. When he turns off the main chassis & coach switches for storage purposes, the batteries get drawn down. He notices when he puts cables on the auxillary battery #2, even with switches in off position, he gets some sparking indicating there is something drawing electricity. Does anyone have any ideas what may be causing this? Any information or suggestions will be greatly appreciated.

[LI Pets]

If you're putting the cables on Pos and Neg you will get a spark.

Or do you mean someplace else?

[Lena Abbott]

If there is no open circuit then there would be no reason for a spark. We are putting the pos cable on the pos termina post and the neg cable on the neg terminal post. Wouldn't you agree that there should be no spark?

[LI Pets]

Correct, not thinking

[bobchevy89]

Hello,some times you will get a spark because your inverter usualy is hooked directly to the aux battery and it is trying to supply juice to the camper fridge and other power units..
Bob

[mustang]

Here is an easy way to figure out where to start. ( if that makes sense)
Take a volt meter digital preffered and with your main switch off and one battery connected that is suspect. Now disconnect the ground from the battery , put the possitive lead to the negative on the battery then the positive lead on the ground wire. This forces what ever is pulling juice to pull it threw the meterI think .02 or something minute is normal. You can the start disconnecting things until the draw drops, thats would be the culprit then. If no significant draw then you got a short in the battery. It kind of sounds like to me it may be with the isolater between the batteries.

Hope this helps