1996 - No more audio....bad factory amp?
1. I replaced my original stereo about 15 years ago with a Sony CDX-CA650X and the accompanying harnesses and FAI-1A Scosche adapter from Crutchfield. All wires were soldered. All of a sudden I started to lose sound. At first, it was only sound from the tuner that would disappear after 10 seconds of play. Months later I couldn't get any sound at all from tuner selection. The CD player kept playing all this time for about a year before all sound was gone. The receiver itself seemed fine based on what the display showed. I've checked the wires (see part 2 of this below) and all is as solid as ever. Is it possible the factory amp bit the dust? The 2 audio/amp fuses look just fine as well.
2. In case it was my Sony, and due to my son needing an up to date stereo of course, I purchased a Pioneer DEH-X6500BT. Hooked it up with the harness it came with, using the same Scoshe adapter, and still no sound. However, I did notice the Pioneer was missing the 2 blue amp/ant wires from it's harness so not sure if it would've worked or not. (the Crutchfield harness pic doesn't show these 2 blue wires either so I assume they're not needed anymore?).
Question Summary then:
1. Is it possible factory amp bit the dust? What else can I check?
2. Should I just bypass the factory amp since Pioneer has it's own? Will it still work with rest of speaker system, etc?
3. Assuming I need to get to the factory amp, what in the world is the easiest way cause it's a mess under there, ha.
Sorry this was long but wanted to get all the detail in as possible.