1994 Yukon brake switch

[SgtPreston]

Trying to install a brake controller but I can't find the brake switch, at least not the typical switch I'm used to seeing. I did find a GM connector that has 6 - 7 wires and I'm wondering if it is keyed to the brake somehow? Any help locating the switch is appreciated.

 

[wjburken]

 

[SgtPreston]

Thanks Wade, I appreciate the link to the video on the brake controller install. I was not sure if the bundle of wires had the brake wire I needed but it appears that it does, just need to find it.