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The homing sequence is where most people get introduced to the electric noise issue. Usually the noise will show up by a pre-mature trigger of a homing switch.
One thing to check, is to make sure that you have the Z homing switch wired to the correct location for the version of grbl that you are running. They moved the Z axis switch location when they changed from version 0.8? to version 0.9?
If you need help finding the problem with your machine read these two threads:
