This part confuses me how do you have them wired up exactly Now all that is left is wiring your Ramps fan, LED strips and hotend fan to the 12V input connection. I know it seems like alot of things going to this input connection but 12V is 12V . It will look a little cramped but it will work. Remember Polarity! + to +. What I did was put the fan, 1 LED strip to 1 side and the other LED strip to the other. It made connecting everything much easier. A fun note! My R1+ LEDS use to flicker alot, after moving them from the connector the to 12V input connector on the Rep Rap Guru Ramps I have not noticed the flickering and they seem brighter!