When I cut the windshield wipers on all the lights light up and it doesn't stop

Hello, Unfortunately this could be the switch, a wiring fault, or a bad wiper control module. This vehicle is complicated, as is every 7-series, so finding the fault may require a trained BMW technician, as I'm sure you have found in the past. There is a chance that you have an issue with the signal wires for the wipers are shorting to other system(s), but, again, you would need an expert to help identify that unless you are well educated on computerized electronic circuits. Before you dig into the wiring and controller, have the starting and charging system tested. A low battery will cause this vehicle to act in strange ways...like this.