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Old 07-13-2015, 01:36 PM   #1
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Battery Voltage

I know there's lots of threads on this general topic, but I can't find one that addresses this specific question. Why is the voltage reading different when the batteries are disconnected from the coach verses when they are connected? When I disconnect the batteries and test them with my multimeter they each (two of them) read 12.69 volts. When I connect them to the coach (which has a converter) they read 10.54 volts. (Using the same multimeter for all tests.)


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Old 07-13-2015, 01:40 PM   #2
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Could mean a loose wire somewhere. Where are you testing when connected?
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Old 07-13-2015, 01:41 PM   #3
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How much current are you pulling when you are connected.
It looks like you have weak batteries or you are pulling a lot of current.
If you only have the minimum turned on in the coach you should only see a couple tenths of a volt change.
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Old 07-13-2015, 01:44 PM   #4
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do you have an inverter and residential fridge in your coach?
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Old 07-13-2015, 01:52 PM   #5
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Those readings in my original post were taken at the battery terminals. When the batteries are plugged in I get the same reading using a cigarette plug voltage meter in a socket inside the coach.

When I plug into shore power the readings go up to 13.63 at both the batteries and plug.


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Old 07-13-2015, 02:52 PM   #6
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Happy Vibe: Everything is turned off, so the only things that should be using current (that I can think of) are the CO/Propane detecter, TVs in their off condition, and the clock in the Magnadyne entertainment center.


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Old 07-13-2015, 02:54 PM   #7
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Fronzie: I have a converter - no inverter. My fridge is not the residential type - and the one I do have is turned off.


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Old 07-13-2015, 02:58 PM   #8
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Sounds like something is drawing current. Pull one fuse at a time and remeasure voltage at battery. This should help you narrow it down.
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Old 07-13-2015, 03:46 PM   #9
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If the batteries are good and fully charged it would take a vary large current draw to bring them down to 10.5V. so if you have the batteries on and reading 10.5V and then turn them off how fast does the voltage return to 12.6ish volts?
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Old 07-13-2015, 06:43 PM   #10
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Flybob: good idea about pulling the fuses. I'll give it a try.


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