DIY 12V Battery Chaining – Need Help with SmartShunt Setup

DIY
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6

In your original post you said aux connected to battery negative. Aux should never be connected to battery negative. It is either connected to a second battery positive or to the temperature sender. See Section 3.5 in the manual.
media/pg/SmartShunt_IP65/en/installation.html#UUID-e50cdc87-a8ef-43fc-187e-71f838c84365

There is a FAQ that may also help.

https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88