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Old 04-21-2021, 09:51 PM   #1
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Question Something is always draining the chassis battery

I have had a Class C 2004 WINNEBAGO ITASCA since new.*Something keeps draining the chassis battery, this has been going on for many years. I have replaced the battery*and it still did it within weeks if not driven. I'm not that*knowledgeable when*it comes to this so*bear with me!*RV repair shop has no idea. Any suggestions would be appreciated. Thank you
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Old 04-21-2021, 10:01 PM   #2
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Every hard-wired LP detector I've seen bypasses the coach battery disconnect switch. This means it has a slow battery drain even with the battery switch off.
If you aren't using the main battery disconnect switch, many things are always on-so to speak; radios, TV's, etc.
If you don't have a battery disconnect switch, simply remove the negative battery cables each time you store the RV.
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Old 04-21-2021, 10:03 PM   #3
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On my 2004 Monaco with a Workhorse chassis I have to disconnect the engine battery if it's sitting for more than two weeks or so, otherwise the battery gets rundown.

My coach has a built in battery switch that disconnects it completely.

You can add something like this and your problem will be solved:
https://www.amazon.com/WirthCo-20128.../dp/B000CQFWLY
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Old 04-21-2021, 10:08 PM   #4
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Well , if your unit isn't equipped to charge the chassis battery while on shore power , then 3 weeks with parasitic draws ( engine controller , trans controller , dash radio memory, etc) I'd consider average.

At the auto dealership where I worked , we were constantly charging batteries on cars on the lot anything that sat for weeks was dead. Vehicles left the factory with a fuse removed , in order to prevent draining the battery while in transit .
Chassis battery disconnect, manual types available , or if you're on shore power ; one of these.
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Old 04-21-2021, 10:32 PM   #5
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I use a trickle charger to keep the chassis battery charged and the MH plugged in when in storage. No run down batteries. Have no idea where the store your RV. A small solar system can also keep both sets of batteries charged if no shore power at the storage site. Or turn everything off when in storage.

In our LP monitor it has an off position that turns it off and closes the propane cutoff valve. No LP, no need for active monitor. Our CO monitor also had a chassis power connection. I disabled that long expired CO alarm when I installed a NEST CO/fire/smoke alarm. One less load on the chassis battery.


Part of the problem with many of the LP monitors is that provide constant 12 v power to solenoid that keeps the valve open on the LP line. Once opened using 12 volts that solenoid does not really 12 volts, but can operate at about 5 volts and use much less power. Not a hard mod.
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Old 04-22-2021, 11:42 AM   #6
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Thank you I will look into some of these suggestions. It is frustrating when this happens!
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Old 04-22-2021, 12:23 PM   #7
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Solar battery charger

I put one of these on my rig
https://www.homedepot.com/p/Coleman-2-Watt-12-Volt-Solar-Battery-Maintainer-58012/203241468[/URL]
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Old 04-22-2021, 03:56 PM   #8
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Our 03 will go about 2 weeks before draining the chassis battery. Has done this since new. Took a few tries to finally lick the problem.

First was to hook up a 1.5 watt solar panel. Wasn't up to the task. Went to a 5 watt panel which worked on and off. Depended on how long and how sunny the days were. Winter time, couldn't keep up. Didn't want to invest in a bigger panel so went to disconnecting.

I installed a battery disconnect switch which proved to work out ok,,, when I remembered to utilize it. Even so, I couldn't dismiss the feeling in my head that habitually removing/adding 12 volts to the engine's ecm might somehow cause issues down the road. Went about a year with this set up.

My present solution may not work for the OP but it has been the best out of everything I've tried. I ran electricity out to where I have our rig parked and added a timer that energizes the rig once a week. The onboard converter takes care of the coach and a separate charger takes care of the chassis.

Went through 4 batteries in the almost 10 years before doing this. Just replaced the 5th battery a couple of weeks ago. It was dated 2012.
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Old 06-14-2021, 05:54 PM   #9
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We had same problem. Now have a lever that is attached to chassis positive terminal, and I just lift the step and slide the lever to off position when not in use.
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Old 06-15-2021, 11:35 AM   #10
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Could you post a photo of this? I'm still trying to figure out which battery disconnect to have installed. I have a Class C Winnebago Itasca.
Thank you
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Old 06-15-2021, 01:11 PM   #11
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Just put in a shut off/disconnect switch for the chassis batteries.

We always switch our off when not in use...
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Old 06-15-2021, 02:25 PM   #12
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I had this problem years ago, and it turned out it was the mirror heater switch, which is on the A-pillar. It wasn't marked and I didn't know it turned on the mirror heaters, or that I had mirror heaters. In fact when the motorhome was purchased during the walk-through I was told that switch turned on the power mirrors, so I always left it on. Obviously the guy didn't know what he was talking about, and I finally figured it out, and stopped having fast-draining problems.

After that the chassis battery would stay up for several weeks or more, but now I have a 10 watt solar charger on it when it's in storage in my backyard.
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Old 06-15-2021, 03:07 PM   #13
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Quote:
Originally Posted by Zoya View Post
Could you post a photo of this? I'm still trying to figure out which battery disconnect to have installed. I have a Class C Winnebago Itasca.
Thank you
https://www.amazon.com/Battery-Disco.../dp/B07MTXDHNV


There ya go.
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Old 06-16-2021, 01:00 PM   #14
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Quote:
Originally Posted by tap4154 View Post
I had this problem years ago, and it turned out it was the mirror heater switch, which is on the A-pillar. It wasn't marked and I didn't know it turned on the mirror heaters, or that I had mirror heaters. In fact when the motorhome was purchased during the walk-through I was told that switch turned on the power mirrors, so I always left it on. Obviously the guy didn't know what he was talking about, and I finally figured it out, and stopped having fast-draining problems.

After that the chassis battery would stay up for several weeks or more, but now I have a 10 watt solar charger on it when it's in storage in my backyard.
Oh wow I have never thought about the heater switch on the mirrors!! I will have to check that ouit. Thank you
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