Quote Originally Posted by cordvision View Post
When unplugging the z axis I noticed that the plug is burnt up.
Examine both the male and the female ends of the connection. If one of them has a round cross section while the other has a square cross section, *that* is your problem. Such mismatched connectors results in line contact rather than area contact for the current flow and this usually only happens when an idiot decides to reduce their parts costs at the expense of reliability.