72 dart wiring harnesss - pictures

There was a small black box that I know is not OEM. I took some pictures of it. It was connected to the coil and had a red hot wire to the starter solenoid and what i think is the blower for the heat/ac unit. I think it's a switch but not sure. It should be last picture that I uploaded. What do you guys think?



thats a relay. don't know why they would have it where they do though.