looks like the top 2 small ones are the coil (control), one side hot from switch other to ground. the 2 big ones on each side are the contacts. 24 v from the trolling motor power. battery to one side, other to trolling motor. i am not 100 percent sure but it is a good guess based on the size of the bolts. if u have a meter u can check continuity by putting the meter on the 2 big bolts and u should have nothing. when u put the 24 v controlpower to the small one u will get a tone. hope this helps.