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I just did this today. I used toggle switch to turn on/off the fog lights separately, and the factory switch still works. I connected the wires from the front controller, and ran them back to inside for the switch.
to the pin 1E connector (white color Always ON + wire ) via a switch to turn on and off.
Or you can use the purple color from the other connector ( this one will only has power when you turn pwr on from the START button)