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What do you mean that they try to ground trough some other pins? The way I understand it is that if they don't have ground, more current will flow trough other pins because that's where the ground is (although with some more resistance)?
And, so wouldn't it be a good idea to put one DRV instead of the (assuming) A4988 drivers on my geeetech printer to test if the voltage (on FAULT) is different?
Just wanna know if by doing this I won't blow something up.

Also... I'm sceptical now. On the photo, there is 0.378V, right? I fear that it is 3.78V so that's why I'm asking.