Sounds like they hooked the power or ground to that to other than an ignition circuit...Shut off chassis power....check and see...shut off house power. then check and see...which ever one works and gets them back to zero when the power is shut off will tell you what leg the shop put that wire to....
Stuart and Stella Denning
2016 Entegra Aspire 42RBQ
The 3 Bulldogs (Daisy, Sylvie and Stashie)
2018 Equinox Diesel (TOAD)