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It is possible that something got left on from your last trip that drained the battery?
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Good question, my very smart spouse asked the same question.
If something was left on that did drain the battery, and then now all are are off (because I verified with the van engine on).
Would something that may have previously drained the battery completely kill the battery from ever recharging?
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Lets try something different and try disconnecting the extra battery from the isolator. Then retake your voltage measurements.
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Can I do this measurement by disconnecting under-hood circuit breaker from home battery, and then measure voltage from terminal on under-seat circuit breaker against the van body as ground?
The battery I purchased in 2009 was a
Fullriver DC200-12, BCI Group: 4D