Yes is there a wire to switch the amp on when the radio is turned on? I have low volume audio to the amp but no sound out? I removed an aftermarket and replaced with a factory radio. I have all chimes and radio functions but no sound out of amp. Fuses are good along with voltage.
I'm under the impression it's on or off. The amp works all the time, radio or disc, to drive the speakers. The amp doesn't just boost the power, it shapes the sound for the Bose speakers. That's why I question having a trigger wire, but I may be wrong... I was once in '57 or '58. :lol