I only have onejonnybischof wrote: Anyways. Summing it up:
From what you've told us so far, you're not doing anything wrong, and have tested the whole setup with multiple parts each. Still nothing works. That is... highly unlikely...
Have you tested everything using one and the same 3D printer controller?
The controller is the same, the relais is the same, the MosFET setup is YOURS and the same...
True, happened also to me...jonnybischof wrote: Double and triple check the wiring. Make sure you have adequate wiring, make sure you have no GND loops. Maybe google up some drawings from other people and compare... You wouldn't believe it, but no electric circuit is too simple to make a mistake with it (my personal experience...)
I doublechecked everything - also the solder joints are ok, the wiring is thick enough and the drawings already checked. I just changed one component at a time in a working system, so... if everything working with my 12V/10A PSU, why the hell not with the 12V/18A PSU or the 19.5V/16,6A PSU - it's just changing the supply, no other part of the system...
Anyway - as we say in Austria "Auf den Bush klopfen und schauen was drunter rauskommt" - wack a bush and look what´s comming out - I will check everything again this weekend...