Hey Joe as usual I need your help!
First of all I tried installing my carpc last night and it was a minor disaster. I don't know about your mustang but mine seems to be seriously cramped in space. It doesn't go all the way back but I think I may have the HD mounted too high so I am going to take the brass spacers off the bottom of the HD case and try again.
I also tried powering the unit on since I had it out there and I got nothing at all. From the harness I have the constant 12v cable connected to the MTX power supply constant 12v and then the ignition wire (from the main harness) together with both "amp turn on" wires (which is from second part of the harness which has the rca plugs and two "amp turn on" wires which turn on the factory amp) and then the negative to the negative. All other wires from the harness are connected to the appropriate ones (FL+ -, FR+ -, RR+ -, RL+ -) and then the rca cables outputting from the computer going into the amp ......I have the amp power cable connected to the battery ran all the way back to the amp and the amp grounded to the back seat. I also have the remote wire connected to the MTX to prevent any popping noises.
Did you have to move any of the factory wiring around or anything else to prepare the dash for the install? The wires I am referring to are on the bottom that control the AC and Fan?
Thanks for any help.