With the shunt resistor modified, which can be done with either a bypass resistor or a custom circuit board, the only other change is to upgrade the 100 A fuse near the battery for a larger size.

A current flows through a resistor ... the current that can pass through the circuit, and also waste power as heat. For these reasons, the current shunt resistance should be as low as possible.

The process can be simplified with special circuit arrangements called current-shunt monitors, which are offered as standard ICs. These devices sense the voltage across a shunt resistor and ...