DC-to-DC + Isolator
The Renogy DC-to-DC chargers are supposed to be connected to the car battery on one side and the coach battery on the other, and they have a "D+" signal input that switches them on only when the alternator is running. So they do not require an isolator.
But, it would much easier in my 1999 Roadtrek 170, if I just disconnect the positive cable on the coach battery (which is coming from the already installed isolator) and connect that to both the car battery side of the Renogy and the D+ signal. And then just continue on to coach battery from the other side of the Renogy, (I would connect the negative on both sides to the coach battery negative, which I believe is a common ground in any case). Has anyone here wired them up in this way? Can anyone think of any reason it wouldn't work?
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