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Old 11-03-2010, 08:15 AM   #29
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2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
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Originally Posted by RichHog View Post
This should be inserted in every Trailer manual that comes with a trailer with "the Switch".

The PO had replaced only one of the factory batteries a few months back, Should the other battery be replaced as it is the weak link in the overall power in the system?
Batteries should always be replaced in pairs (or entire bank, if more) unless all are just a few months old (ie. you got a defective new battery and it failed early in life).

In practice, I'm not sure what I'd do if my other battery was only a year or so old. I would do some extensive testing out of the coach before assuming the replacement and the "slightly used" one were performing differently.

That being said, I think pretty much all the "experts" will tell you to replace all hooked in parallel (12V) or series (6 V) should be changed out together.

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Old 11-03-2010, 10:52 AM   #30
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San Luis Obispo , California
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My experience is identical to SilverGate's (see posts #25 and 26). I also have a solar system on my AS.

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