Good Sam Club Open Roads Forum: Class A Motorhomes: Chassis battery
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kemer

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Posted: 08/31/19 01:31pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 2014 Winnebago sightseer. Chassis battery is only a year old and fluids are full. I have shore power(50amp) plugged in. However, if I leave unit unattended for a period of time(Still plugged in), my chassis battery drains. It never used to happen, but has happened the last two times I've left it. Any suggestions as to cause?

Thanks

MountainAir05

New Mexico

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Posted: 08/31/19 03:20pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have a volt meter that you can check the battery voltage.

wa8yxm

Wherever I happen to park

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Posted: 08/31/19 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

Ok, Many RVs the house converter or charger also charges the chassis battery.. Same as the Engine alternator charges both chassis and house via the isolator.

However MANY =NOT= ALL. yours may be one of the "Rest" as it were

IF you are supposed to have a bi-Directional isolator.. IT's not working

IF you do not.. Trick-L-Start


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


time2roll

Southern California

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Posted: 08/31/19 04:41pm Link  |  Quote  |  Print  |  Notify Moderator

+1 for Trik-L-Start


2001 F150 SuperCrew
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Matt_Colie

Southeast Michigan

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Posted: 08/31/19 05:54pm Link  |  Quote  |  Print  |  Notify Moderator

Kemer,

It didn't used to happen?
What have you added? A CO or LP monitor that should have been on the house bank?
No?

You have probably left on a light in a closed compartment or maybe a small fan somewhere. Just keep looking and you will find it.

Matt


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


georgelesley

Tennessee

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Posted: 09/01/19 07:10am Link  |  Quote  |  Print  |  Notify Moderator

We have the same model as yours, just called an Itasca. Ours and likely yours has the equivalent of a trickle start installed at the factory. It keeps both batteries topped up when plugged in. I don’t recall exactly what it is called, but it does the same thing. If yours does not do this maybe it is broke.


George & Lesley
2014 Itasca Sunova 33C, 2019 Jeep Cherokee Lattitude Plus toad, Demco/SMI towing system

Yankee Clipper

Cairo, GA

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Posted: 09/01/19 08:46am Link  |  Quote  |  Print  |  Notify Moderator

I did two things to address this problem: 1) I replaced the original flooded battery (the factory tag was still on it) with an AGM; 2) I bought a Coleman smart charger from Newegg on a flash sale for $14, and I keep it attached to the battery while my rig is stored. I also keep a lanyard on the steering wheel to remind myself not to start the engine with the charger attached, lest I fry yet another battery charger.
HTH


Yankee Clipper
2014 Winnebago Sightseer 33C on Ford F53 6.8l V10
2014 Honda CRV 4 down toad/Roadmaster Falcon2 with EvenBrake
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gme105

Spokane, WA

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Posted: 09/01/19 06:07pm Link  |  Quote  |  Print  |  Notify Moderator

On my Chateau 28Z, the shore power charger is disconnected from the batteries (both house and chassis) when the battery disconnect is set to "store". You can check with a volt meter across the house batteries; when the battery disconnect switch is in store, you would show a voltage of ~12.3 and a voltage between than 12.7 and 14.2 with the disconnect switch in "Use" (or connected...) and on shore power. If voltage is the same regardless and below 12.5, then check the fuses and breakers. Hopefully the solution is that simple.

One other note; the CO and propane detector and one radio draw power at about 1/2 amp from the house batteries whenever the switch is connected. Neither can be turned off independently.

Dutch_12078

Winters south, summers north

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Posted: 09/01/19 06:23pm Link  |  Quote  |  Print  |  Notify Moderator

Since 2011, Winnebago has used a "BIM" (Battery Isolation Manager P/N 174291-01-000) device to monitor both battery systems and operate a solenoid as needed to maintain the charge on both systems. The BIM replaced the older generation "BIRD" (Bi-directional Isolator Relay Delay) that had an annoying loud solenoid. It looks like your BIM may have failed in some fashion.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
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2011 Toyota RAV4 4WD/Remco pump
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