autostaretx
Erratic Member
Here's what i think is happening ... and your "loads" current flow would only add to the blue back-flow.The BB is wired to shunt in the same way, but for some reason, it shows a negative current (-1 amp) when it powers on. I'm thinking this is its quiescent power that's required to run the fan, lights, etc.).
This is why having the house batteries' negative leads current split across multiple pathways will confuse the shunt.
Once you remove the house-to-chassis wire, the Green flow will become the only one that matters.
It's quite likely that your current situation is mildly charging the two house batts at different rates.
--dick (shunts have to have resistance to develop their 100 millivolt drop (at full load))
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