Ok so I just installed my TR7 Pro from PAC ($30 on Amazon), and the unit seems to be bypassing just fine. I have an APPradio da02 which is a 1st Gen installed in my 2004 F-150.
I used the "Clarion" Preset
Attached the following wires.
TR7 Pro - Radio
Green - Blue
Blue - Green
Black - Black (Ground)
Red - Red (12v Switched)
I'll update after a while.
Something else I found out... Before the TR7 Pro, I had a simple relay installed and that worked, IF, I did the following:
1) Turn the Truck on (ACC or start)
2) Wait for relay to click