Aftermarket Switch Illumination

[patkelly4370]

When adding an aftermarket switch, '17 SR5, where is the easiest/best place to tap in to illuminate the switch?
The switch has 2 wires for illuminating it.
The switch activates the device as intended.

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[daytonaviolet]

open any illuminated switch and look for green (+ for dimming) and grey (- for dimming)