Start relay puzzle

[rrhorton]

Have good circuits from battery to car and ground. Close the ground disconnect switch and lights, horn etc work. Push start button nothing happens. Checked start button normal open. pushed have circuit. Jump from relay battery terminal to starter post on starter and engine spins. Checked ground from relay to starter/chassis and is good. If I jump from the battery terminal on the relay directly to the S post, there is no click so it seems the relay is not pulling in to contact. Have already replaced the relay once and still the same problem. What am I doing wrong?

It is a 12 volt neg ground system.