Can anyone tell me what this adaptor is for?

 

Phono to DIN plug signal adapter!
Max.

 

that's a stereo wiring harness for a ford with a factory amplifier.. note the white and grey for front speakers and violet green for rear. and the blue wire is the amp turn on from the aftermarket head unit.. retails for 18 bucks at any automotive shop around..

 

my bad,, after thinking about it, that's for a Mitsubishi... used one last week at the shop..