Meyer 23056 Trailer Lights Logic Module can be installed to prevent your plow’s parking lights from illuminating when the vehicle’s brake is depressed. This part may be required in law in some states, check your local laws. This module is used on the newer Meyer Standard Operating System (SOS) wiring. This module has 4 plugs and one ring terminal lead. Each plug has 6 pins.
Here is the installation manual for this part.