If you were to peel off the harness shrouding, the RW goes back to the IGN socket. Early harnesses have 4 wires for the IGN sock [BW-ign, BY-starter, W-+ve feed and the RW] and the later ones have a 6 spade plug. When then my early 4 spade plug was fitted to the ign barrel the W [white wire} was connected dirctly to the RW wire via the key barrel.