I have a 2000 GTP with the Bose speaker package. I installed my HU the other day, and things were good. I then tried to install my subwoofer, but even without the ground wire installed, my amp was showing 10v with the car in accessory mode. with the gound hooked up, it would show 12v, and the sub would hum, but no sound reproduction. Then today I was working on the sub, and the stereo cut out suddenly. The HU went blank, and won't power on! I checked all of the fuses, but none were blown that I could tell. The speakers are outputting a slight hissing sound, so I had to unplug the bose amp to stop that. What happened? What can I do to fix this? Thanks,
Harvey