double horn, hi low?

[drew4x4]

did the earlier models have two horns, or just one? when did they switch, if they did?

my 77 only has one horn, behind the driver's side headlights - am i supposed to have two?  
its a 77 K20 Bonanza edition

[Lt.Del]

you're supposed to have two horns.

[drew4x4]

i found the second horn wire, where the horn was supposed to be!

i replaced the relay with a brand new one. the relay clicks when i ground the horn button like it should,
but with a 12 volt tester at the horn wire there is no power at the horns.
do i need to replace my fuse box? or the wire that runs from the fuse box to the horns?

thanks in advance!

[drew4x4]

bump-with the relay unplugged from its harness, probing all three sockets that it plugs into with a 12v test light - aren't one of the wires going into the relay supposed to be live at all times? there is no constant power to any of them, which certainly narrows my horn problem down!

[SeanD]

Yes. 

Like this?

[drew4x4]

that is an awesome diagram. thanks.