It's the return wire from the ignition switch, it has power when the key is on. It's basically the wire that powers all the accessories.
I talked to a scooter master about the positive reading from the ground ports on the cdi. He says the positive reading on the ground side of the cdi is normal when it has power to the power port and nothing plugged into the ground ports. Once you plug in the ground plug the reading is normal as to ground.
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