I have a Tundra 2004 with a JBL audio system. My plan is to use the Metra Axxess TYTO-01 wiring harness to allow for RCA input to the stock amp/speakers, but I've got it all hooked up and I have no sound. I assume the culprit is the Amp Turn-On Wire, and not having it connected to anything to tell the amp to turn on. I attempted to connect it to the accessory wire to see if it would power the amp up on ignition, but nothing. Any ideas?