Ground house bank to start bank/engine?

[ERTF]

I have just updated from a large single lead bank that did everything, to a Lifepo4 house with a dedicated group 31 lead start battery for each engine.

I have a ton of solar and don't move the boat much, so for now I am not concerned about routing alternator current to the house.

But should there be a negative connection between the house and starter batteries, so the house has a ground path to the engine?

 

[Delta Riverat]

Yes, all DC negatives should be common.

 

[ERTF]

Yes, all DC negatives should be common.

Is there specific start and end points that I should make the connection between house and start batts or engines?

I have a battery monitor shunt that all 12v negatives for house, solar, inverter route to. The starting batteries negatives route to the engines.

Thanks

 

[Delta Riverat]

You should connect the starter negatives after the house shunt, ie so that the shunt is not bypassed.