itsnevo

I got my Pioneer stereo installed and working great now, and with using the factory amplified speaker system. On the factory wire harness, there was no 12 volt switched wire at all. My Corrado is a 1990, so mabye they didn't have the switched power source that early. There was a 12 volt constant power, a ground, 1 wire that put out around 3 amps to turn on the factory amp, a ground for the common ground speaker system, and a dimmer wire, no other wires were there and only one wire had a full 12 volts but it was a constant power supply. With the Metra aftermarker wire harness, there was extra wire that had a connector specifically to add the switched power source which I spliced into the switched power source going to the rear defrost, and there was 2 extra wires that I had to use to add the amp turn on and ground to get the factory amp to turn on that went from the factory wire harness to the new stereo. After all that was sorted out, it worked great!!

I have a 1990 Corrado, and I am putting in a Pioneer Cd player, and I've discovered something. If you hook up a volt meter to the factory wire harness, there is no 12 Volt switched power supply, only a constant 12 Volt power supply. In fact if you buy one of those aftermarket stereo wire harness adapters, you will notice that where the aftermarket wire harness has the 12 volt switched source, there is no wire on the factory wire harness for it to connect to. I guess I have to find out where I can splice a wire into to create the 12 volt switched source.