Help requested - installing end stop sensors onto my chinese 3018 Pro

[Doddy]

I can't open the link to Banggood - site down at this time (at least for me) at this time. However, I've found other RAMPS 1.4 limit switches with green/black/red wiring.

STOP!, recheck your wiring.

Green to +, black to -?, no, you provide the correct instruction - red to +, black to -, and green to 'S' (guess, "Switch" or "Sense"). What you have described with Green to + is that when you actuate the switch you're shorting the PSU to the RAMPS drivers. Chances are that's crowbarring the supply to the microcontroller and that's why the machine is losing comms with your PC.

The limit switches on the control card should have 3 pins - get us a photo of that, or just review what you've done with the above in mind. I wouldn't power the machine until you've done that.