I then wrapped up the connector and joint with electrical tape for that extra clean look
I then did the same to the driver's side for a nice final result:
At this point I could focus on all my wiring
I did a MS Paint drawing of the basic circuit required to make this work.
Now the Latching relay will always be sending power to either circuit A or circuit B, and I wanted my fogs to turn on and off with the parking lights. So I needed a second standard relay.
The standard relay takes the signal from the parking light circuit to turn on the fog light circuit.
Once the fog light circuit is on I can use my fog light switch to turn the fogs either on or off, whatever selection I leave it as is what it will be the next time I hit the lights. The fog switch won't do anything if the parking lights are off.
(Please excuse the low quality drawing, It's been a long day)
When you turn on the lights with the mutli-function lever, or via the Auto Lights Feature) The BCM grounds a white wire that runs all the way to the trunk fuse box. The Parking Light Relay engages when it receives that ground signal and the parking lights come on.
You want to tap into this white wire
I tried finding it in the BCM Harnesses and in the drivers side door sill harness.
There are multiple white wires in each harness. I tested about 4 per harness and none of them reacted to the parking lights circuit.
So I went into the trunk and removed the trunk fuse box.
After you pull out the carpet on the drivers side you'll see the fuse box. At the top of the box is a small tab in the center, Simply pull it towards you, then slide the box towards the rear of the vehicle, It'll pop right out.
With the box out, flip it over.
I found it easier to unscrew and unplug the red wire harness connector so I had more play with the box:
The white wire we need is towards the other end of the box:
It is that small white wire towards the top right, I pulled it out on it's own so you can see it. This wire is grounded when the parking lights are turned on.
I found it easier to cut a piece of tape that held all those wires together, gave me more wire to work with.
I took that white wire, cut off some insulation, and then split the wire like so
I then took my yellow signal wire and stuck it through the opening (This was supposed to be white wire but I forgot I had a roll)
I wrapped that all around, soldered it, wrapped it nice and tight with electrical tape and then wrapped the entire harness together
I ran my new yellow signal wire along with the harness and tucked it under the sill plate on the drivers side rear door and front door. I then brought it to my kick panel.
I had a white wire that was already ran through my firewall for my old fogs so I just soldered the yellow to the white in the kick panel and left it as is.
Then under the hood I could start connecting the first relay.