Wiring new horns

[rbassemir]

I bought two new horns and went to mount and wire them up and ran into a problem.

On the new horns, one terminal is grounded to the horn body. So with the horn mounted on the fender, it is grounded. The brackets I have to mount the horn to the fender, do not have any insulation that would prevent the horn body making an electrical ground with the fender.

Wiring diagrams shows 2 wires going to the horn. The horn button is the electrical switch that grounds the horn to make it beep. But with the horn mounted it is grounded already so the horn would beep immediately.

I am wondering how it was done back in 1935. Is the horn bracket some how isolated with rubber washers so it did not ground the horn?

Or maybe the horns back in 1935 were not grounded to the body of the horn?

I thought I could put in a horn relay and just run a single wire to the horn since it is already grounded through the body. But I thought I would post something here to see what others have done (or what I am doing wrong).

PS The horns did not come with any wiring instructions. Nor did the mounting brackets (if I am supposed to use some insulating washers).

Thanks
Rich