5V VCC and 12V AUX (1 reply)

Hi all,

Bit of a skeptical user here as I've gone through an Arduino Mega and Ramps 1.4 board so want to make sure I do things right...

I've bought a new ramps 1.4 board which has come with a jumper on the two 5V pins. Do I leave this there or remove it?
I plan to use the 12V AUX pins to power an external fan to cool the boards.

Any help appreciated

Preddy