Bill, if the box that the converter is in is plastic then a equipment ground is not needed and the bare ground wire can just be left unattached. If however the box is metal, there should be a ground lug on the outside of it somewhere that the ground wire will attach to.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7