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The target power consumption of MSXIV's LV system is 20 W. A reasonable accuracy will be the +/- 0.1% of the total power. Given the supply voltage will be 12-13.5 V, the current sensing circuit should be more accurate than +/-  1.5 mA.

Mathinline
body\dfrac{20\, W}{13.5\, V} \cdot \pm0.1\%=\pm1.5\, mA

Locations

Given the HSD will be responsible for disconnecting the load when it is shorted to ground, there is no safety advantage for high side current sensing. There are three locations for the current sense resistor:

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