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Whose jacks to you have? Make and model?
I would try jumping the switch first and rule that out. If they work, then switch is probably bad. IF not, go to the motor and direct wire them to see if the motor works. That will allow you to narrow down the source of the problem. We can go from there once you do. All follow ups are included in our fee.
Are you sure you had the meter set correctly? Hard to believe all 4 are bad in any place. More likely the meter was wrong OR you have a bad ground lead for those. Add a good ground lead and see if that changes this.
Don't neglect the wife! Sounds like a bad ground here. Install a test ground and see if this will correct this.
Just checking back in here to see if you were able to track this down or do you still need some additional input from me here
O.K..........you can always get back to me later if you need to.