i part out alot of cars and would like to take the following plugs and make a "sub-harness" i could have attatched to a 12v source that i could plug into and test the following systems without the cars system enabled
( like a crash car with wiring damage or dead battery / cut cables )

( door controls - mirror,window.locks )
( seats )
( radio )
( speedo at least so i could check mileage )
( rear hatch lock - i dont get keys with some cars )

i could send these plug-ends to someone and pay someone to make me a harness that i could use to make sure components are good before selling them

thanks for your time and someone let me know if you are interested in tackling this ( a gm body/electrical mechanic would be great )