I have a color coded version someone did for a '78 that works good for my '76. Here's one for a '73 if you didn't already have it but make note of Coolerman's corrections below it. Also a treasure trove of undoctored diagrams and more here from the same wiring expert. You can see the RW from...
@FlimmyFlam I think in order to help folks will need to know the model # or year range that switch is for. I assume that's a FJ40 column? For my vehicle, the RW on a 9/72 - 9/79 would be the 12v feed from the light switch to the dimmer, energized when the switch is pulled.