Hey.
Jazzman, IIRC, when I bypassed the premium amp in my car, there were 2 connectors on 1 side and 1 on the other. I think the side with 2 connectors was for the power to the amp and the other for speakers. IMHO, just take the amp out completely. To me, that was alot easier to do than try and figure out things. And I did mine at work! The only thing I had handy was a Haynes manual, and it wasn't even accurate with the colour wires!
But again, to each his own, I suppose. I've always installed my own stereo and that was the way I found easiest on my car. Hope this helps in some way
