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Old 05-05-2016, 06:35 PM   #1
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Coach battery question

Hi, we have a class A gasser with a residential refrigerator.
Does anybody know if the coach batteries are charged when traveling down the road?
Thanks!
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Old 05-05-2016, 06:42 PM   #2
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There are many variations of Class A Gas. To answer your question you will need to identify which one you have. Make, Model, Year.
By editing your signature with this information, readers will be able to identify and assist you much better.
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Old 05-05-2016, 07:02 PM   #3
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It depends on the model, how it was equipped, and whether the battery control system still works as new. For instance, in our old 1998 Southwind, the charging functions of the Battery Control Center no longer work. It would cost $500 or more to fix it, but a $35 Trikl-Start charger solved the problem of maintaining the chassis battery while plugged into shore power. At this point, I do not have a solution to charging the house batteries while away from shore power other than running the generator.

If yours is an older gas motorhome, I suspect the residential refrigerator must be a retrofit. If so, you may not have enough battery and inverter capacity to really support it. If that is the case, you have either got to be on shore power or running the generator to keep the fridge cold.
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Old 05-05-2016, 07:07 PM   #4
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A volt meter is your friend.
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Old 05-05-2016, 07:16 PM   #5
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If it came that way the answer is probably yes assuming everything is working correctly.
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Old 05-05-2016, 07:23 PM   #6
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At this point, I do not have a solution to charging the house batteries while away from shore power other than running the generator.
.
Pick up a Yandina or Cyrix battery combiner. They sense charging voltage from either battery and combine for Bi-directonal charging. About $70.00
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Old 05-05-2016, 07:26 PM   #7
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I believe it is a rare or very old MH that does not charge the house battery from the main engine charging system.
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Old 05-05-2016, 08:18 PM   #8
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Roada,
It appears your thread has been hijacked. To answer your question:
Yes, your house batteries should be charging while under way. That is if you don't have the battery disconnect switch turned off.
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Old 05-06-2016, 06:02 AM   #9
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"Roada's" public profile indicates he owns a Thor Challenger 37 LX. Using RVtrader and NADA, I could not that model sold before 2014. So I assume (and could be in error) that this is a late-model coach.

"Roada"-

According to page 96 of the 2015 Thor owner's manual, the coach's alternator should charge the house batteries, through the "Battery Isolator Controller." It's also addressed on page 100, under "Chassis Alternator."

<edit>I do note, however, that the owner's manual is for all Thor coaches (A, B+ and C classes), so your coach's electrical system may not match what the manual says. I suspect it does have the controller, and does charge the coach batteries while underway, as this is a common feature for Class A coaches made after 2010 (or so), and for some coaches of all classes father back than that.</edit>
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Old 05-06-2016, 06:08 AM   #10
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Quote:
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A volt meter is your friend.
This is true. A charged battery will read about 12.6V. While charging it should be over 13. Just check the voltage then start it and try it again. If it is charging there should be a noticeable jump in voltage.
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Old 05-06-2016, 07:14 AM   #11
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This is true. A charged battery will read about 12.6V. While charging it should be over 13. Just check the voltage then start it and try it again. If it is charging there should be a noticeable jump in voltage.

.....and do all of this while not pluged into shore power.
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Old 05-06-2016, 07:29 AM   #12
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.....and do all of this while not pluged into shore power.
Ooops! Yes good advise.
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Old 05-06-2016, 05:11 PM   #13
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Thanks for the replies.
I'll check the battery voltage before and after starting the engine.
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