We have a travel trailer with 2 - 12v batteries connected in parallel (Neg-Neg & Pos-Pos) using 4 GA wires
The Pos from one battery goes to a bus bar where all other Pos wires are connected using 8 GA wire
The Neg from the other battery goes to a bus bar where all other Neg wires are connected using 8 GA wire, the bus bar is connected directly to the frame
For the Shunt install, assuming I am correct, I will take the Neg from the bus bar that is currently going to the battery and redirect it to the Shunt - System Minus then add a new Neg wire from the battery to the Battery Minus of the Shunt. Install the Red shunt power supply and I should be done... correct?
Next question, should the new Neg wire be of 8 GA to match the existing Neg to ground or should it be 4 GA like what is between the 2 batteries, my guess is 4 GA is fine b/c that is what the RV is using.