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Suppose you want to run a ramps with an arduino.
It depends if you want to run everything on 24 volts or only the bed.
I had changed everything to 24 volts..
Hotend 24 volts
Fans 24 volts
Bed 24 volts
Ramps controller unsolder one of the automatic fuses ( it says 16 volts on it) the other one is OK
Replace by another automotiv fuse.. (search on youtube)
Remove the diode that powers the arduino
5 volts stepdown convertor to power the arduino
Thats it It is wise to control the board via an external MOSFET board.