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Starting battery drains; not charging from shore power
Hello SMB community --
I own a 2015 MB Sprinter SMB conversion. I don't drive it very regularly this time of year, but have it hooked up to 110V shore power most of the time. Problem is, even though my house batts stay fully charged, the voltage on my engine battery goes down and down and down... today I checked it after charging it fully only 1 week ago, hooked up to shore power the whole time, and it was down to 11.7V.
I have a battery isolator that allows me to jump the engine battery w/ a "manual override/reset" button, which I understand puts all batts in parallel. I want the engine battery to share the charge from the house batts, but they do not stay in this configuration for long -- it gets a jump but then stops accepting charge.
I had a parasitic drain on the MB side addressed by the dealer only last summer, with a new battery installed. I can't understand why it is dying again. I thought the isolator was supposed to favor the engine battery when the RV is hooked up to shore power.
Help appreciated!
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