Which cable is positive (red on vrm) and which is negative (black on vrm)? For Radio Power : r/FRC

FIRST Robotics Competition documentation

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How to determine which wire is positive and negative when clamps are gone and one wire is solid black and the other is black with a white stripe charger - Quora

REV Robotics - The REV POE Injector Cable is included in the FRC Kit of Parts and was specifically designed to address a common problem for many FRC teams with their wireless

How to Identify Positive & Negative Wires: AC, DC, & More