Location of stereo wiring in dash
 

Does anyone know the route the wires are run through from the head unit to the dash speakers? I have a rattle in my driver's side dash that won't go away and has gotten worse over time. I've been all through it from underneath and also pulled out the gauge cluster to look behind there and everything I've suspected as the culprit and dealt with has apparently been wrong. It sounds like a loose connector or metal part is banging against another metal area. The sound gets gradually worse as the dash gets colder (i.e., when the a/c is on) and only happens over bumps or during braking. My dash speakers were replaced by a shop a long time ago and I suspect the original speaker-end connector has come loose from wherever they may have taped it off but I can't find it. It's a 2000 car.

If you unscrew the speaker and lift it out you should be able to see where the connector is.

I've had the speaker out, but it's not the current connection I'm looking for. I think the original wires with their connector are somewhere inside the dash bouncing around. The current speakers do not use the original wiring. I'm hoping to look where the old wires would have come out by the speaker and see if the original connector is there.