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Old 04-18-2016, 10:34 PM   #1
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Battery draining when not being used

I have recently purchased a 263RL Forest River Heritage Glen travel trailer. The tt has been sitting in my RV pad and after a week the batteries were completely dead. I plugged it in and the batteries charged, I then unplugged. Three days later I am down to 1/3 battery life. Any idea where I might begin to trouble shoot?
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Old 04-18-2016, 10:48 PM   #2
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1. With an ammeter in series with either battery lead, turn off or remove the fuse from one circuit at a time to see which circuits are creating a draw.

2. Check the loads connected to any circuit that has a draw. Example: Sometimes my radio comes on by itself and kills the battery quickly.
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Old 04-18-2016, 11:14 PM   #3
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The parasitic power drains will empty batteries in just a few days IF you don't keep it plugged into shore power or you don't use a battery disconnect switch.
Since you appear to not have used either, you may have damaged the batteries by letting them completely drain.
You should recharge them completely and then test each cell with a hydrometer.
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Old 04-19-2016, 12:37 AM   #4
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You need to install a battery disconnect or install a battery tender, or leave the trailer plugged in 24/7. Even a 1 amp parasitic draw (LP detector, CO detector, Sound System standby etc) will draw down a battery by 24 AH every day. So after 4-5 days one single deep cycle (100-120 AH) battery will be dead.
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Old 04-19-2016, 01:20 PM   #5
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Better running low

I have a battery disconnect and have shut that off. I have gone to tieback of the coach and manually shut off both house batteries and chassis batteries. My batteries still go empty after about 3 days? Checked fluid levels in batteries and seem fine. Any thoughts
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Old 04-19-2016, 01:47 PM   #6
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Battery draining when not being used

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Originally Posted by zimmnc View Post
I have a battery disconnect and have shut that off. I have gone to tieback of the coach and manually shut off both house batteries and chassis batteries. My batteries still go empty after about 3 days? Checked fluid levels in batteries and seem fine. Any thoughts


You really should start your own thread so as not to confuse people about what unit we are talking about.
When people start reply to two different people things get disorganized.

Sounds like you have a motorhome and the op has a travel trailer, two totally different animals.
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Old 04-19-2016, 02:14 PM   #7
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If you left them on the charger for at least 24 hours...and you have the battery cut off switch on...you should be seeing 13.2V or MORE measuring at the battery posts with a voltmeter with the charger still on. If NOT...flip the battery cut off switch in the other direction and check votage again.
If neither way shows over 13.2V AT THE TERMINALS with the charger on...then you have a charger problem which could be as simple as changing a fuse in your converter.
If you ARE getting 13.2 and going flat quickly...chances are you have old or damaged batteries. The way to confirm this is ,to fully charge the batteries overnight....then remove the BLACK wire from the battery post for 24 HOURS. Then check voltage. If the battereis are like new they will read 12.6/7 at the posts. If they have some loss of capacity...you'll get a reading in the 12.3-12.5 range. Anything less than this is severe damage...and you should get after your dealer to replace them...(I'd do it for anything less than 12.6 on a new coach. )

Now if the battery checks out...and thecharger is working...the only reason you are not holding a charge MUST be a parasitic or phantom load. Usually these are small loads that take several weeks to run down a good battery...so I am skeptical it is this. Nevertheless if you get to this stage...BUY a CLAMP ON AC/DC multimeter on Amazon for about 50 bucks...and clamp on the red battery wire which will show you how many amps of current are being drawn with your battery disconnect switch on.
A single amp draw can deplete a battery completely in a few days, even a 1/2 an amp is a lot. Once you know the draw...have someone pull and replace all your 12V fuses one at a time until you see the phantom load change.
Once you have the source of the drain located, you can simply disconnect it or keep that fuse pulled when you are away from your unit.
Good luck!
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Old 04-19-2016, 02:17 PM   #8
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Unless you turn absolutely everything off it will drain. Smoke alarms and CO sensors are always on. You could have a battery disconnect switch somewhere. Took me a bit to find ours but that will save your battery.

I had what you describe happen when I had the switch turned off. I had a battery with a bad cell.
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Old 04-19-2016, 02:25 PM   #9
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Is the fridge running on the batteries? If so look up my thread.
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Old 04-19-2016, 02:36 PM   #10
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Quote:
Originally Posted by Wind Drinker View Post
I have recently purchased a 263RL Forest River Heritage Glen travel trailer. The tt has been sitting in my RV pad and after a week the batteries were completely dead. I plugged it in and the batteries charged, I then unplugged. Three days later I am down to 1/3 battery life. Any idea where I might begin to trouble shoot?
I had the same problem with my TT. I was told that it could even be the preset buttons on the Radio/DVD system. I bought a battery disconnect switch that I installed on my battery terminal. Here's a link:

Auto Battery Link Terminal Quick Cut Off Disconnect Master Kill Shut Switch | eBay

It works great! Battery now lasts for months.
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