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Old 06-26-2015, 04:40 PM   #1
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Dead batteries

I'm New to rv'ing bought a 07 dolphin and the battery for the engine dies if it sits for couple of weeks! New battery and disconnect switch turned off, what could be problem?
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Old 06-26-2015, 05:00 PM   #2
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Do you have 2 disconnects?

If not, the one your turning off, may be for the house batteries.

Get the start battery charged up, turn off the disconnect, and see if it starts , with the disconnect off.

Once you know, there are options you can take, according to how you store it.
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Old 06-26-2015, 07:47 PM   #3
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On my 1998 Southwind, the batrtery disconnect switch for the engine battery does not disconnect everything. However, it takes several weeks to run down completely, so it hasn't been much of a problem for me.
If you have not been inadvertently disconnecting the wrong battery (as twinboat suggested), you have something for a load that is wired such that it bypasses the disconnect switch.
Someone may have done an improper 12 volt wiring modification on your coach
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Old 06-27-2015, 10:31 PM   #4
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I believe National RV did not use a chassis disconnect in any of their coaches. The chassis battery will go dead in about two weeks because of parasitic draw from the CO and or the Propane detector, ECM, and radio memory. The only way to keep the battery from going dead is manual disconnect it. If you haven't found it yet there is a National RV Owners Forum on iRV2.

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Old 06-28-2015, 07:07 PM   #5
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Thanks for your help. I was wrong, the disconnect is for the coach batteries and it will start with disconnect off. The battery still goes dead rather quickly! Will it hurt anything to disconnect the ground cable from the stRting battery even though all 3 batteries are connected?
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Old 06-28-2015, 07:32 PM   #6
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Quote:
Originally Posted by Frank Holcom View Post
Thanks for your help. I was wrong, the disconnect is for the coach batteries and it will start with disconnect off. The battery still goes dead rather quickly! Will it hurt anything to disconnect the ground cable from the stRting battery even though all 3 batteries are connected?
I don't think it will hurt anything. However, you will lose the function of whatever items are powered by the chassis battery, and likely will lose radio settings, during the time of disconnection.

Another solution (which I am thinking of doing for my own rig) is to get one of those small portable solar chargers that plug into a 12 v power (cigarette lighter) outlet and put it on the dash while the coach is parked. If you have a 12 v outlet that is powered all the time (when key switch is off), there is no installation, just plug it in. I think you can find this type of charger at most auto parts stores. Unless you have a lot of drain going on, the solar charger should stay ahead of it.
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Old 06-29-2015, 06:34 AM   #7
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If the battery is original equipment manufacturer then it is approaching end of life and needs to be replaced. 7-10 years is about the limit for most batteries.. and it's been 8. so you are in the "Anticipated repalcement" window.
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Old 06-29-2015, 07:57 AM   #8
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While it is setting. If you go in and out of it once in a while.
Those auto steps going in/out use the start battery.
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Old 06-30-2015, 06:17 AM   #9
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I installed "knife blade" disconnect switches on chassis and house batteries. I can go probably 6 weeks with out starting or charging mine now. $27 for the switch, maybe $8 for an extra battery ground wire and a few minutes to hook it up.
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