I have a 2010 GT with the Shaker500 and Sync. I have a 600w mono MTX amp and 10" square MTX sub.
I got the 4ga power and ground run.

I am really stuck with the remote wire. I just pulled the dash apart and got the Fluke out to see what wire would give me 12v when I turn the radio on.
But I don't think Ford wants me to take the deck out. The wires are so tight in the back that you can't even pull the deck out. So I tested all wires I could on the display and the front panel and came up empty.

I do not want to just use a switched 12v acc wire unless it is a last resort. I would rather use a proper turn on lead so the amp will only be on/off with the radio>>>me being ****!

So can I get the signal from the shaker amps? I think I read that they were 5v on previous Mustangs, if so can a relay be used to to make this work for me. I haven't seen any diagrams to hook the relay up this way.

Also I have the MTX re-Q. I wasn't planning on installing it right now because I'm not too happy with the arrangement of the sub box and amp rack. Will this be that noticeable. I switched out the rear deck speakers and they are definitely getting full range from them.
With the re-Q where would be the best place to get the signal from the stock speakers, at the shaker amp for the subs or the rear deck speakers that I already have spliced for?

Thanks