[jrwilson]

Just finished this on my car. There should be both switched and constant power available. Confusingly, the colours are reversed from normal - yellow for switched, red for constant. If the stereo has lighting tied to the headlights, you can easily build a blade adapter to tap into the wire on the ignition switch and therefore not cut or damage any wiring. Ground I just used an existing hole in the dashboard.

I'll never understand these hackjobs. It's not that hard to do it right.