Stan Birch
Well-known member
This is a rather common routine problem with the OEM isolater solenoids used by Winnebago.
In the absence of ignition being on, coach and house batteries are isolated from one another via the battery isolator solenoid. When the ignition key is on, the solenoid closes, connecting the two sets of batteries together, allowing the house batteries to be recharged. After a bit of use, the contacts on the isolater solenoid become charred, and fail to conduct current to the house batteries for the purpose of charging.
The replacement solenoid must be of continuous duty spec. And the good part, is that they only cost about $20 at almost any auto parts facility.
If they do not charge on shore power either perhaps the battery terminals need to be cleaned; or the house battery ground connection is defective.
As for the comment that "Batteries in parallel, like yours (and mine) should ALWAYS be replaced in complete sets with the exact kind/brand/capacity."; it's the other way around: Batteries connected in series must be matched. For batteries connected in parallel, it doesn't matter.
In the absence of ignition being on, coach and house batteries are isolated from one another via the battery isolator solenoid. When the ignition key is on, the solenoid closes, connecting the two sets of batteries together, allowing the house batteries to be recharged. After a bit of use, the contacts on the isolater solenoid become charred, and fail to conduct current to the house batteries for the purpose of charging.
The replacement solenoid must be of continuous duty spec. And the good part, is that they only cost about $20 at almost any auto parts facility.
If they do not charge on shore power either perhaps the battery terminals need to be cleaned; or the house battery ground connection is defective.
As for the comment that "Batteries in parallel, like yours (and mine) should ALWAYS be replaced in complete sets with the exact kind/brand/capacity."; it's the other way around: Batteries connected in series must be matched. For batteries connected in parallel, it doesn't matter.