# How to connect power and fan to RAMPS 1.6?

My RAMPS 1.4 board has failed. I bought a RAMPS 1.6 to replace it but :

1. The old board had 4 power wires that went to 5 A and 11 A respectively. The RAMPS 1.6 has only 1 pair of power inputs. Which pair from the PSU do I connect to the board? Or do I combine them and connect them to their polarity respectively?

2. I have a cooling fan (12 V) for part cooling. In RAMPS 1.4, I had it connected to the pins between the power inputs and the X stepper driver on the board. The RAMPS 1.6 doesn't have such a pair of pins. Is it possible to connect it somewhere else on the 1.6 board?

• Hi welcome to 3DPrinting.SE! – 0scar Feb 5 at 22:05

The part cooling fan should preferably not be connected to a (non-schedulable) 12 V header. Instead you should use the D9 output connector to schedule the airflow of the fan for part cooling.