Okay, figure I explain my wiring a bit.
The main harness is pretty easy. Take a look at the wiring diagram in post #48, connector C290a. Pretty much just wire it up to the metra harness directly. Pretty simple. I left pin #2 unhooked as i guess the SN95 provides voltage in start and run to prevent radio from turning off. The fox doesn't have this
As for the amp wiring, here's what I did.
Connector C290b
4 and 8 are your amp turn on leads. These are +5-7V DC when active. Will be a prob turning on an amp that requires 12VDC. You only need 1 of these wires. So tape the other up.
1 and 2 and 5 and 6 are the wires you want. Go to radio shack and get some RCA's. You just need 2, but use different colors. Split them, and cut one end off. Separate the RCA's into the shields and the cores. Twist the shields together and solder to the negatives (5 and 1) and then solder the positives to 2 and 6.
Just try to remember which is which. Pin 1 and 2 are your front amp, which means it will power the two door speakers. Pin 5 and 6 are the rear amp, which means the rear hatch speakers. I used the RED RCA for the Rear speakers (R for rear) and the white RCA for the fronts.
The Mach 460 is wired in a messed up way. The head unit controls 4 tweeters which are stereo. So any stereo imaging is done with the tweeters and HU only. Mach 1000 has a little more punch to the tweeters than the 460.
The mid/lows are driven off two amps. One for front speakers and one for rear. These are MONO signals. SO whatever amp you use will need to be able to do MONO inputs. So my white RCA is the front mono and the red is my rear mono. 1 input, 2 speakers.
Of course..this info is pending my testing. As of right now, major radio wiring is done, and i have my 4 tweeters working. Just need to find a way to us a 7V AMP turn on wire to turn on an amp needing 12V and then i can confirm the sub wiring. A little work, but this is actually fun to do.
Edit
http://www.google.com/search?q=pac ...=shop:1&source=og&sa=N&tab=wf&biw=981&bih=661
That might take care of the amp turn on. Had a coupon I got in mail, Sp got it for $3 from best buy.com!