Wiring ditch lights to fog light button

Is there a schematic/plan/general steps out there to wire ditch lights onto the already existing fog light button and have them both turn on with the single button?

 

I would consider just making a very short male H11 to female H11 mini harness that splits power off at the factory H11 plug before plugging into the OEM fog.

If you are running LED fogs like Morimotos, then you can power your ditch lights right off that power wire as the LED fogs will have reduced the amp draw on the fog circuit.

If running OEM halogen fogs, use the power wire to activate a relay to a stand-alone harness to activate the ditch lights.

If you want to be able to run the fogs on the street, with the ditch lights off, an additional button would need to be wired in after the power split, such than when the 2nd button is on they both turn on with the fog switch, but the 2nd button is off only the stock fogs turn on.