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Switch Lock Wire in power plug of controller for BLDC motors

Where to connect 3-rd (switch lock wire) to battery if I do not have any switches, and of course battery has only P+N wires (2 wires)?

If the connector below is the one that you are referring to then the purple wire goes to the positive lead of the battery pack. 

The controller needs to be turned off when the vehicle is not in use so a power switch is needed between this purple wire and the positive lead of the battery pack.

Please let us know if you have any questions.

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