i am not a mitsu guy, but that does look like an mpi relay to me. And if it works how i think it does then one of the two coil wires should trace to a 80 or 100 amp fuse somewhere and connect to the alternator somehow. But I am only guessing....check the 100 amp fuse with a multimeter. these fuses are not the glass looking ones where you can see a connection. you have to set your dmm to the diode function as if checking for a short or bridge