3 Horns?

[MACEDONIA <macedonia-statc@kaman.com>]

In the process of dismantling my '66B, I noticed that there are three sets of 2
wires, all of the same color combinations (purple, purple/red, I think] that
enter into the compartment in front of the radiator. One set goes to the horn.
The other set, I believe, would have gone to the second horn (optional
different tone], but where would the third set have gone? All these wires are
in the orignal cloth covered wiring harness. 

Any ideas?

David Macedonia [1966 MGB]
macedonia-statc@kaman.com