Went to AutoZone and picked up a Sure-Bilt Highway Blaster Low Tone horn,
close in size but a bit larger than the OEM horn. (DL136L-12V)
Removed the left headlight assembly to access the horn mounting bracket.
The bracket is V shaped, with the OEM horn on one leg, and an open leg for
the horn I added.
Horn mounts on the bracket with a 10mm nut to a stud on the back side of the horn.
The new horn came with one wire with a ground lug ring on one end, and a fast-on
terminal on the other end. I cut the ring lug off, and spliced that end into the horn harness.
I made the other lead wire out of 22Ga wire, and a lug I had in my tool box.
Next, I unplugged the horn harness connector from the OEM horn, removed the horn from the bracket,
then I removed the plug-cap on the OEM horn (luckily the horn has a 2-piece cap/plug),
and put a tinned lead into each cup of the connector plug-cap,
and re-installed the plug-cap on the horn. Mounted both horns back on the bracket.
Plugged them in, and I now have a decent sounding horn.
No more wimpy Asian-car sounding bleeper.
Took me about 1 hour.