One of my horns is dead. Any trick to figure out which one? They are cheap at rock auto so I may buy both. hopefully my inde will only charge me a 1/2 hour!

 

Can't you just disconnect one and test, then try the same with the other one?
Or is it not as simple as pulling an electrical connection?
Edit - per the diagram in the Workshop Manual there is one electrical wire/connector/plug leading into the pair of horns then two thin wires, one running to each horn, so my guess is you can disconnect those thin wires one at a time.
Dunno how easy/hard it is to get to those wires though.

 

I'm not sure they're that easy to reach. I actually have an extra pair I got because I wanted the bracket to fit up some Hella Supertones. I haven't done that yet. It's in the queue with other other projects but more important things keep cutting to the head of the line.

You can easily see both through the grille. If you put on some hearing protection and have someone activate the horn you should be able to figure out which one. Maybe get a dowel hold it against each in turn to feel for vibrations? It might be a bad connection on one. There is a small harness that plugs into the car harness and feeds both horns. Hold on, let me get a picture ...

EDIT: Here you go:



The two units are mirror images of each other but look to have identical numbers. I expected some difference indicating high or low tone. The Supertones, for example, are labeled 300Hz and 500Hz.

 

The repair manual says the hood has to come off to remove the horn.