High Battery Drain on my Rig

Seems like when I am dry camping this rig seems to kill batteries faster than any other rig I've had.

In fact, sometimes when I put a freshly charged battery online it is down to 1/2 charge (~12.8 volts) within a 1/2 hour with no load applied. Something is not right??

Any ideas what to check? Thanks.

Has this always been a problem? If not, when did it start? Is that the original battery? It might be time to replace it. Your Sig. says you rig is a 2006. That's 4 years. I replaced the battery in my 2000 Jayco in 2006 but I noticed problems with it retaining a charge at least a year before I replaced it.

It has been since I owned the rig. We bought it used in early 2009. My newest battery was purchased in 2008 and it has the same problem. That battery should be good I would think since I have treated it properly.

If you charge the battery, does it hold a charge OK when nothing's hooked up to it?

Unless you have some test equipment (like an ammeter to measure the current draw), about the only way I can think of is with your shore power unplugged, disconnect all the 12V electrical appliances and then hook each one up by itself to the battery to determine which one is sapping all the power from the battery. There are fuses you can pull for many of these which should make the testing go easier. You can't have many suspects if all the (12V) lights are turned off (I'm going to assume there is no problem with the light circuits): converter, refrigerator, furnace & A/C controls, HWT control, alarms (propane & CO), radio, TV signal amplifier and water pump come to mind but there may be others depending on how your TT is equipped. My first suspect would be the converter, but whoever the guilty component is, I would have think it would be generating some heat if you're losing half your battery power in a half-hour.

Just as a reference, when dry camping, my battery lasted about two days before I had to charge it.

Good Luck!