I suspected that the "combiner/isolator" (same thing) would energize before the starter got started, but in my case it does not, as described earlier.
If it did energize before the starter starts, then that must mean the house batteries always help the engine battery start the starter. LY gave some thoughts on that.
I have only long #10 wire to the house batts positive side (frame neg), so to take real advantage if the isolator energized first, I would need fatter wire on that path. So I like mine the way it is.
I don't know what the other MHs do for wire gauge on the house battery side of the isolator where they also have that dash rocker switch as described in the other thread.
