We have a problem with our 07 Georgetown 350DS Class A Motorhome draining both the Starter Battery and the House batteries in a matter of 3 days. I can't figure out where the draw on the batteries is coming from. I just put in a brand new Starter battery because my old one (6Months) old would not even register on AutoZones battery meter, charger to try and bring it back to life... It was an Optima Red Top. Replaced under warranty. My house batteries are 2 Trojan T105 6V's. These are about 8 months old. We have been having this problem for almost 2 years now but have put a bandaid on it by keeping them both on a trickle charger to keep them full. So about 4 days ago I wanted to see how fast they would drain. I put the Schumacher Charger on the batteries and did a rapid charge on the batteries until they all showed 100% then waited until the next day and checked voltage. This is what I got.Day 1Starter 12.3vHouse 12.27vDay 2Starter 11.94vHouse 11.69Day 3Starter 11.20vHouse 11.41Day 4Starter 6.46House 6.44So you can see there is a consistent voltage drop from each day and major drop from day 3-4. I have no idea what's going on. To be honest this is actually pretty good because before I had an RV Mechanic tell me to turn off the Climate control Switch off in the Dometic Refrigerator my batteries would drain in about 12-16hrs to the point you couldn't even start the Motorhome without a jump. All these numbers are with the Dometic Climate Control switch off and it lasted a few days longer but something else is causing a drain on the batteries.Also when the RV is not being driven like now when I tested the batteries I have the House Disconnect switch turned on so everything should be disconnected.. Not sure where to go from here..Any ideas?

charge them up , if they will charge and then take off the neg cables at the battery. The voltage you post for day one show that the all battery are not fully charged 50%. Start them out at 10 amps till they are charged, 24 plus hours plus, then switch to 2 amps and finish them off. Could be another day, depend on the status of battery. Then remove the negative cables and check them in 12 hours plus. If voltage is falling then you battery have a low cells. With the cables remove easy to find which one is at fault. Then post back. A bad alternator diode can cause them to drain, stuck relays.

The Schumacher charger that I have only charges at 3amp 5amp or 20amp. Should I start the 6v and 12v batteries out at 20amp and go until full then go to 5amp then 3amp? Also I am going to unhook the 6v's from series and charge them separately. That way I can make sure each one is charged all the way. Since the 6v's are hooked in series to do the drain test on the 6v's do I just unhood the cable that goes from the Pos to Neg on the batteries? Or do I unhook the Ground and leave the +to- connected?

Also what should a fully charged 12V battery read when fully charged? I was under the impression that 12.3 or 12.27 that I got on the 1st day indicated a full charge. Also I am pulling all the batteries and charging them separately with no cables attached then will reinstall and put only the POS cable on correct?

How long have you owned this motorhome? Is this something that just suddenly started? I have a similar issue with my recently purchased motorhome and I think it may be a mis-wired after market radio that the previous owner installed before I purchased it. I'll find out in the spring when I take the radio out and check the wiring. I'm also wondering whether my non-functioning day-time running lights have anything to do with the drain on my starting battery. I have removed the battery and it does not go dead when it sits on the floor of my garage. The day-time running lights have a relay that I have been unable to locate and it may possibly be shorted?? Best of luck trying to figure this one out! In the meantime I have added a switch to isolate the house battery charge line from the starting battery so that both of them are not draining at the same time.

I had the same problem with a 2007 Georgetown 37TS and it was eventually traced to a mis-wiring issue that had the heated mirrors always on-Switch was Off but current was still always flowing at about 2 amps and killed the battery, Worth getting someone with a DC ammeter to measure current draw when supposedly everything is off and then just trace which wires have current flowing.Post if you need more details.

Major Battery Drain on 07 Georgetown Class A | Good Sam Community

14 Replies

You_can_t_take_
Explorer
Jan 29, 2016
How long have you owned this motorhome? Is this something that just suddenly started? I have a similar issue with my recently purchased motorhome and I think it may be a mis-wired after market radio that the previous owner installed before I purchased it. I'll find out in the spring when I take the radio out and check the wiring. I'm also wondering whether my non-functioning day-time running lights have anything to do with the drain on my starting battery. I have removed the battery and it does not go dead when it sits on the floor of my garage. The day-time running lights have a relay that I have been unable to locate and it may possibly be shorted?? Best of luck trying to figure this one out! In the meantime I have added a switch to isolate the house battery charge line from the starting battery so that both of them are not draining at the same time.
lacofdfireman
Explorer
Jan 29, 2016
Also what should a fully charged 12V battery read when fully charged? I was under the impression that 12.3 or 12.27 that I got on the 1st day indicated a full charge. Also I am pulling all the batteries and charging them separately with no cables attached then will reinstall and put only the POS cable on correct?
lacofdfireman
Explorer
Jan 29, 2016
The Schumacher charger that I have only charges at 3amp 5amp or 20amp. Should I start the 6v and 12v batteries out at 20amp and go until full then go to 5amp then 3amp? Also I am going to unhook the 6v's from series and charge them separately. That way I can make sure each one is charged all the way. Since the 6v's are hooked in series to do the drain test on the 6v's do I just unhood the cable that goes from the Pos to Neg on the batteries? Or do I unhook the Ground and leave the +to- connected?
MountainAir05
Explorer II
Jan 29, 2016
charge them up , if they will charge and then take off the neg cables at the battery. The voltage you post for day one show that the all battery are not fully charged 50%. Start them out at 10 amps till they are charged, 24 plus hours plus, then switch to 2 amps and finish them off. Could be another day, depend on the status of battery. Then remove the negative cables and check them in 12 hours plus. If voltage is falling then you battery have a low cells. With the cables remove easy to find which one is at fault. Then post back. A bad alternator diode can cause them to drain, stuck relays.

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Major Battery Drain on 07 Georgetown Class A

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