ME TOO 2
Newbie
My thoughts almost exactly RawbDidItI was thinking something along the lines of using a small bus bar and then insulating it so it doesn't accidentally ground to anything.
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Except that have bee considerng a hefty 250A (or greater )bus with at least 4, 1/4" studs.
Wiring would be battery negative via shunt to the buss then all other grounds come off the buss.
However
Have you read RichLo's comment about all the other grounds floating round in the vehicle.
It makes sense that monitoring the negative side may not be practical.
Once I have the meter, shunt & bus in hand I may try it for the learning experience.