Stereo Wire HELP!

[Grant Dion]

Hi
I installed an aftermarket stereo in my 91 200TQ. (Stereo in and sounds
great! 2 amps located in rear deck, 4 speakers and a SUB.) I am looking for
a good 12 volt wire to connect to that has NO power with the ignition off. I
have found some wires that are switched, but they don't seem to have a full
12 volts. If anybody can help me locate this unicorn, I would appreciate it.

Grant in Colorado Springs