Motorsports ECU Wiring Harness Construction - RB Racing Getting electrical signals from point A to point B is pretty standard thing. a piece of copper wire between A and B and the job is done. A century of development has left us with increased specialization in wiring, connection devices, and everything in between point A and B. "Mil-Spec" or military specification, has become the buzz-word in motorsport electrical harness construction. Motorsport Wiring Harnesses | bf1systems bf1systems offers motorsport engineers the complete range of interconnect solutions and wiring harness components to aid them with building or maintaining their own wiring harnesses. Components are available quickly, and can be shipped around the world.