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Author Topic: House batteries go dead while driving  (Read 594 times)

cougsfan

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House batteries go dead while driving
« on: May 24, 2017, 05:05:34 PM »
I have a 2011 Winnebago View (class B+ Sprinter based).   We have been on a road trip for the last two weeks.  A few days ago the house batteries were dead when we arrived at our campsite (12.0V) Not enough juice to start the generator.  I plugged into AC and it charged them fine to 13+ volts.    The next morning they were fine, and as we drove for the day they went dead again.   Recharged them again.   The next day they stayed charged (?).   Then today they started going dead again.   I figured the batteries, although only 1-1/2 years old, must be bad, so stopped and I replaced them today.  (yes they are hooked up correctly).   After I put the new batteries in they were setting at 12.6 V with the motor not running.    When i started the Motorhome's motor, they immediately went down to 12.3V.   We drove for 50 miles.   The house batteries were at 12.0 V.   When I shut the motor down they climbed slowly back to 12.2 volts on their own.    So it appears that the new and old batteries are probably both good, but the motor home engine is supposed to charge the house batteries while you drive.   It pulls them down instead at times.   This is all recent.     No heavy loads are running  (Refridge is about all) while we are driving.   The chassis battery has maintained a good charge all the while.    Any ideas on what to look for?   We will be on the road three more weeks!
2011 Winnebago View

John Canfield

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Re: House batteries go dead while driving
« Reply #1 on: May 25, 2017, 06:56:28 AM »
If you are like the larger units, there will be a battery mode solenoid which energizes when the engine is running combining the house and chassis battery banks. We've discussed this a zillion of times here - do a search in this board for battery mode solenoid or Trombetta.
--John
2005 Horizon 40AD, 2006 Jeep Rubicon Unlimited
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blw2

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Re: House batteries go dead while driving
« Reply #2 on: May 25, 2017, 07:42:50 PM »
mine has an intellitec delay control on a contractor relay, to tie together the two battery systems..charging the chassis and house of either the converter or the alternator. 

Just last month, i had the same experience that you described, and discovered that the contractor was bad.  Luckily, I was camping at the Sun n Fun fly-in and convention..... where I was able to find several vendors with sufficiently rated continuous duty contractors for sale....turned out to be an easy fix.
Brad (DW + 3 kids)
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Arch Hoagland

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Re: House batteries go dead while driving
« Reply #3 on: May 26, 2017, 01:33:46 AM »
Do you have an inverter?
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SkateBoard

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Re: House batteries go dead while driving
« Reply #4 on: May 26, 2017, 02:03:29 AM »
Sounds like your car battery is gone and dragging down the others or your alternator is dead

John Canfield

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Re: House batteries go dead while driving
« Reply #5 on: May 26, 2017, 07:24:59 AM »
Sounds like your car battery is gone and dragging down the others or your alternator is dead
That's a possibility. If his batteries are the original ones, time to replace just based on age.
--John
2005 Horizon 40AD, 2006 Jeep Rubicon Unlimited
Our Horizon projects
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mel s

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Re: House batteries go dead while driving
« Reply #6 on: May 26, 2017, 09:40:09 AM »
That's a possibility. If his batteries are the original ones, time to replace just based on age.
In his original post the OP said that he already replaced his 1-1/2 year old batteries.

mel s

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Re: House batteries go dead while driving
« Reply #7 on: May 26, 2017, 09:50:56 AM »
Sounds like your car battery is gone and dragging down the others or your alternator is dead
In his original post the OP said: "The chassis battery has maintained a good charge all the while", (which is an indication that his problem is not with either the car battery or the alternator).

SkateBoard

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Re: House batteries go dead while driving
« Reply #8 on: May 26, 2017, 11:09:56 AM »
In his original post the OP said: "The chassis battery has maintained a good charge all the while", (which is an indication that his problem is not with either the car battery or the alternator).

Ya, cause the other batteries are keeping it charged!!! lol

Lou Schneider

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Re: House batteries go dead while driving
« Reply #9 on: May 26, 2017, 11:13:39 AM »
If the chassis battery was dead he wouldn't have been able to start the engine unless he pressed the Boost switch.

Molaker

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Re: House batteries go dead while driving
« Reply #10 on: May 26, 2017, 12:36:06 PM »
Most of the 12 vdc stuff for a Sprinter is located under the front passenger seat.  Here's a diagram that may help.  This diagram and others can be accessed on the Winnebago website here.
Tom & Joyce and Ditto the "don't tell her she's a dog" Westie
U.S. Navy (Ret)
2014 Winnebago ERA 70X 24' class B Sprinter chassis

 

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