I finally gave up on the old 6-volt horn and bought a new 12-volt dual horn setup. I had fried either the horn or the relay or both. The new one came with no wiring instructions. It is equipped with a relay, but the terminals on the relay are not marked. At the risk of having the same thing happen as happened with the old horn, I want to make sure this time it is wired correctly. The relay is attached to the horn bracket and one terminal has two red wires, one from each horn, attached to it already. This is one of the two outside terminals. I presume these are hot leads from the horns. I am guessing that the hot wire from the ammeter + terminal goes to this same terminal on the relay. Correct? Then there is the wire running from the horn to the relay. Which terminal would this go to? Center terminal or other outside terminal? And last would be the horn button wire that goes to the relay. Center terminal or outside terminal? Last question has to do with a ground. Is one not required? Thanks.

1953 Chevy 3600 3/4-Ton