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Servo signal S (usually yellow) on RAMPS pin D11.
12V and GND from power supply to Vin+ and Vin- of an external DC-DC 5v switching converter.
Vout+ and Vout- (5v , GND) of the external DC-DC switching converter to 5v and GND of servo input (usually RED and BROWN).

That's all!

Ciao,

Gianni.