I have an 84 T/A with no power hatch, no power mirrors and no power seat. Are there preexisting harnesses for any of these? If anything, does anyone have wiring diagrams of these so I can get these hooked up properly? I would appreciate any help I can get.

 

The wiring will more than likely NOT be there. If you check the electrical page there is a link to wiring diagrams, good luck. You will need to get the required wiring from a donor car and install yourself.