Archangels

good day ladies and gentlemen, i'm installing my bee*r into my S5 TII, i have the wiring schematics and what-not but cant for the life of me think of where to wire the white wire, i figured to the e-brake assembly but isn't there a connector of some sort that when it's pulled, it's grounded? i haven't looked yet as i'm waiting for it to warm up, but figured i would post a thread and ask, incase anyone down the road wants to search. i've spent a while searching with no avail.

thanks!