At 06:22 PM 8/21/2013, Jim Felder wrote:
>So, big 12v wire straight to the horn, big ground wire interrupted through
>the relay at  85 and 86, with the trigger and ground as usual?

Big 12V wire to the horn + terminal *and* to the relay 86
terminal.  This supplies +12V to the horn and to the relay control coil.

Horn - terminal to relay 30 terminal with heavy wire.  This was
formerly connected to the horn button wire.

Horn button wire to relay 85 terminal, so it now grounds the relay
control coil instead of the horn itself.

Relay 87 terminal to ground with heavy wire, to make the power ground
formerly supplied by the horn button.

Yours,
David