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Old 03-12-2015, 04:31 PM   #1
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House Battery Wiring

Hello - I'm in the process of replacing dead house batteries and need a second opinion on how the house batteries are connected. The image below contains both a parallel/serial diagram for four 6v batteries and two 6v batteries and the voltage results. The two 6v battery diagram on the right is what I did with the two nearly dead batteries after study diagrams of what others did. On the otherhand, the diagram on the left is the original setup from when I bought the coach from the previous owner. I did not have time to trace some of the cables that is why there are "???" next to them.

I'm wondering if the way batteries are connected correct and the voltage results make sense? Thank you.


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Old 03-12-2015, 04:59 PM   #2
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House Battery Wiring

First, in both diagrams the voltage (if measured to ground) does not make sense. You can't have two different voltages on the left of each diagram from the same terminal (12.x and 4.x and 12 and no reading), look at your red lines.

Next, all positives could go to the same place and the same with the grounds. However, since only so many terminals will fit on a post, the are often tied to different post in the series/parallel situation.

Lastly, 2-6volt batteries have to be in series to get the required 12 volts. 4-6volt batteries would just be two sets of series batteries and the sets in parallel.

As a side note, there are many series/parallel drawing on the Internet for reference.
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Old 03-12-2015, 07:06 PM   #3
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Here is how my 2001 Alpine is wired for 6, 6 volt batteries and the 2 Coach batteries.
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Old 03-13-2015, 06:49 AM   #4
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The only way you can have significantly different voltages at different ends of the same wire/cable is if the cable is broken (open) or there is a bad connection (high resistance or open) at one or both of the cable connectors.
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Old 03-13-2015, 07:25 AM   #5
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Old 03-13-2015, 07:41 AM   #6
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This thread may help you:

Batt Compartment Project -- Questions
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