Stumped on Ramps 1.4. Stepper Wiring. Motors dont work, everything else does. (5 replies)

Hello fellow reprappers,

I'm currently assembling a Prusa i3 and having issues with the wiring of the Ramps 1.4. board. I'm having following Problems:

The stepper motors don't work at all. No noise, no jiggle. Nothing

However: The hotend heats up, and even the heated bed heats up. So the power supply shouldnt be the issue.

I am using Marlin + Pronterface. Everything is wired up, even the endstops (position: normally closed).

My stepper motors have 6 wires, and thats where I think my problem is. I have sorted the 6 wires into pairs of 3 (3 wires per coil, measured connectivity). Then I measured the resistance between the 3 wires and ended up with 6 Ohm and 3 Ohms. I then used the 6 Ohm pair as I figured the last wire was the center of the coil. This procedure was described here. The two wires that were left over, are now just tangling beside the printer. Do they have to be connected to each other or to GND?

I then connected to the ramps board: Coil 1 Coil 1 | Coil 2 Coil 2

I also have installed 3 jumpers below each stepper motor driver.

I seriously can't figure out where my problem is. I have googled for two days and searched through this forum, but only found solutions where people had forgotten to put the stepper motor drivers on the board or the powersupply wasn't strong enough..

Does anyone have an idea where my Problem could be? Are there any commands that I can send to Marlin via Pronterface that check my wiring?

Thanks in advance!