Well I did successfully install the D3 into my 03 'stang GT with the mach 460 system, but a few problems have now arisen.

 

First, when I was connecting the unit, I didn't know which RCA plug I should have used for the 460 system on the 8 PIN harness from the Metra set. I used the rear speaker RCAs, because it sounded better on the lower end. Is there another/better way to connect the system (IE both front and rear speaker RCAs to 1 set in the harness?)?

 

Also, there is this annoying whine who's volume matches the RPMs my engine is at (alternator whine maybe?), which leads me to believe my grounding choices sucked. So the unit is coming out today, and being reground by soldering all the grounds together, and soldering that end to 10 gauge wire, and grounding that 10 gauge wire. Will that method work better? Right now its all tapped into the metra harness ground and that skinny wire is grounded.

 

Thanks for all the help so far, and thanks in advance for answering these questions!