Just got through doing this trick as well. Nice & thanks!
General notes for others:
Purple tapped wire goes to the cut blue wire on the relay.
Red/Black tapped wire goes to the cut Red/White on the relay.
The cut wires are covered individually and connect to nothing (I used a super small wire nut and black electricians tape to cover them).
Getting the relay off is
PITA, I couldn't so I did the transition on the relay. Hard to do, but can be done with patience.
When using the Parking Lights - Fog lights will come on, but fogs indicator in the dash (to right of "lights on")
WILL NOT be on.
When using the Main Lights - Fog lights will come on, but fogs indicator in the dash (to right of "lights on")
WILL be on. Keep this in mind if you're not sure if the fogs are "on" - just turn your lights on, if the fogs are on, you'll have an indicator, if off, no indicator.
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Next I want to put a switch on/into the DRL's Fuse (#37) - that way you could have parking lights, no DRL's, and Fog lights on / or just no DRL's
See this Post:
Is there a way to turn on DRLs with headlights
Only problem is being able to "mock up" the fuse to fit
Also like the DRL's on with low beams idea too:
DIY: DRL's on with low beams
Reference fuse guide:
Fuse & Wire Guide