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Old 04-19-2012, 08:54 AM   #1
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Battery charge going down without use.

I bought a new Grey Wolf 21rr and have not been anywhere yet but have noticed the battery goes down just sitting at the house with nothing on. I'm talking like maybe a third in two days of being unplugged. I guess I can unhook the battery and charge it and let it sit in my shop a few days and measure the voltage to see if the battery is ok. I know there is a carbon monoxide detector, propane detector and smoke alarm. Also there is an outside stereo control and I think it stays lighted all the time. Is this enough to drain the battery? I'll never be able to dry camp this way.
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Old 04-19-2012, 09:00 AM   #2
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Quote:
Originally Posted by comfun1 View Post
Also there is an outside stereo control and I think it stays lighted all the time. Is this enough to drain the battery? I'll never be able to dry camp this way.
Short answer... Yep.

You need a disconnect switch or take the ground wire off the battery.
A 75AH battery will last about 96 - 120 hours with "nothing on"
In realility there is a LOT on when its "off." Disregarding internal battery resistance which will discharge a battery over time, there is between 1 and 1.5 amps of continuous draw from parasite sources all over your camper. From the Propane detector to the clock in the radio, it all adds up.

Dry Camp? Well now there is a long story.
MANY great threads here about that.
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Old 04-19-2012, 09:14 AM   #3
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One of the most popular and useful mods for a camper.

$23 at amazon.


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Old 04-19-2012, 09:17 AM   #4
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And, if you plan to dry camp, then you really need to consider bigger batteries, LED lighting, etc.

Add solar or a generator to really extend your trip. I have lots of ways to spend your money

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Old 04-19-2012, 09:51 AM   #5
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You need a battery disconnect switch as pictured below.
I have that exact same one on my trailer.

You also can do a bit of detective work to see what's doing the
discharging.
Get a decent VOM (volt ohm amp meter).
Set it on amps scale.
It needs to be able to handle at least 2 amps.

Now pull your fuses one at a time.
Pull a fuse, place the meter leads across the fuse opening and read
the meter.
The meter completes the circuit and reads
the current draw in that circuit.
Most will be zero but some won't.
Note the ones that give a reading and how much and what the
fuse was for-- ie radio, LP detector, etc.
Note the 2 big fuses side by side above the rest.
These are the fuses that connect the battery charger to your battery.
Believe it or not the charger will discharge your battery when the trailer
is not plugged in.
The discharge rate is slow but it's real.

Once you have your notes you can see what's doing the dirty deed and
decide what you want to do about it.

Also as mentioned get a few LED lights. They draw only a fraction as much
as regular bulbs.

Good Luck!
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Old 04-19-2012, 11:38 AM   #6
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I'm cheap, I mean, thrifty.
A couple of wing nuts from lowes allows me to disonnect my battery when needed...cost was what, $2? No tools needed.
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Old 04-19-2012, 12:39 PM   #7
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We keep ours plugged into shore power 24/7/365. That is your other alternative....
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Old 04-19-2012, 12:47 PM   #8
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If you decide to get more than 1 battery for dry camping I
Would also suggest a battery shut off like I use.
it has four positions
1 both batteries off
2 battery one on and battery two off
3 battery two on and battery one off
4 battery one and two both on

Bought from the battery doctor
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Old 04-23-2012, 01:35 PM   #9
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I have this problem of draw down w/nothing on. batts only last about a day.Class a 373ds. Run gen for a couple of hrs. Shows a charge on my meter. and onl get a 2/3 full charge shown on control panel. Same w/engine alt. Dealer says a .02 amp draw while sitting is normal????? does any one know for sure what the problem could be. Have un plugged every 12v fuse one at a time and foun nothing irregular.
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Old 04-23-2012, 01:54 PM   #10
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Radio light draw
Propane detector draw
co2 detector draw
you may have others
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