I used the traction control fuse. Why? Because I don't give a damn if that gets fried. Lol.
I, up until today, had a hi/lo converter hooked to the rear speakers to my amp with the remote going to the traction control fuse. It works but it's a bit annoying when the subs stop but the music carries on when you shut off the key. Minor inconvenience.
I prefer the wire taps to cutting. You can cut them and wrap them in electrical tape.
I didn't like the sound and lack of control with the factory head unit. It sounds so much better with the aftermarket unit.