I,m hooking up the horns in my 445 ⎘ volt] and a couple questions have come up. The horns are '75 245. I have a couple relays that I think are from that car. They are little metal cubes from Bosch labled 12V 20/30 amp. They have 5 terminals, #86, #85, #30, and two #87. I just wonder what terminal #86 does. Also, the ground terminals on the horns are actually attatched to the mounting studs. This seems redundant to me since there is a good ground from the stud to the bracket to the body. Is it really necessary to run ground wires too?