Help hooking up accessory on aftermarket deck

[DSMissed]

I've got a Pioneer stereo wired up so that the speakers and grounds are right. I can get power to it only when I hook up the constant 12v on the truck, with the yellow wire and red accessory on the Pioneer. Makes sense. But I have 3 wires left over in the truck, a red with black strip, blue with red strip, and solid pink. From what I can tell, none of these is an accessory/ignition wire because I have tried hooking them all up, and get nothing. Checked them all with a voltmeter, and get nothing out of any of them.

I did steal the heated mirror fuse to replace the radio fuse that I blew, I don't think that would have anything to do with the problem, but worth mentioning.

Help! This thing is frustrating me badly!!!