I did this install 3 weeks ago.... sorry no photos trailer is in storage. Prior to installing the shunt I had a 4 gauge cable from the batt to the negative bus in the trailer, and a second 2 gauge cable from the batt to my inverter...
I simply attached 2 ring terminals to those negative cables from the battery and terminated both those negative leads to the shunt (batt side)
Then I made 2 new cables (2 ga and 4 ga) and Terminated the 2 ga into the inverter and the 4ga into the neg bus for the trailer.
Hope that helps. It was an easy install for me ...
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