The horn button grounds the relay (which has positive power from the battery connection anyway). Your relay may be marked something like B (for battery) H (for horn) and S (for switch). The image I sent you earlier has the upper bearing, the wire and the connector ring. Yours is probably still there. Don't know about the wire, however.
Jon


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end