Installing vehicle wiring harness

One or more connectors at one end of a wire bundle are passed through a polarized through-opening in a wall. The wire bundle is advanced to place a grommet having a substantially right angle curved bend, through and along which the wire bundle curves, immediately proximate the polarized through-opening on one side of the wall. One end of the grommet is inserted into and through the through-opening, and the grommet is advanced to pass its curved bend through the through-opening until the curved bend is disposed on the other side of the wall. Then a polarized groove in the grommet is seated in the polarized through-opening to locate a direction in which the portion of the wire bundle exiting the one end of the grommet extends from the grommet's curved bend.