Problem with limit switches tripping

I have just finished a cnc conversion of a Proxxon mf70 mill using an Audinio and stepper driver card.
The problem im having is that when i turn on the spindle motor the electromagnetic pulse is causing a hard stop to be triggered in GRBL.
I tried fitting sheilded cables etc with no success.
Does anyone have any tips on how to cure this as i have read that you can fit capacitors to solve it, just not sure how you go about it.


@PhilJohnson has the cure

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I just tagged you in a post regarding this.

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