I didn't really have to lengthen it. There was a very small amount of gray colored tape (a "band" of tape, if you will) that almost looked "break away" by design, which I pulled and, well, broke away from the harness.
It's almost as if someone knew I'd be adding the horn. The connector pulled out of the black pocket (a little sticky but steadily and easily) and then pulled away from the main harness by breaking the gray band (again, easily). Looked like about 8 inches in length.
I may take your advice on pointing that horn down to drain, which means I may have to look into placing it in that other location in the rear corner. What would cause water to build up in there anyway, driving through a creek? Or, is condensation a byproduct of tooting? And wouldn't tooting the horn blow out any water? I want to say toot one more time - don't know why. If I get water that high up on the vehicle, I will be close to having much more serious problems and the whole dang vehicle will need to be pointed down to drain...
I will have to say that my horn sounds better, but this wasn't a humongous improvement. I expected a significantly higher pitched sound out of the new horn, but it seems to me to be barely different. Now my horn sounds more harmonic and melodious. My part number is 86510-0C020 and the description says "Horn Assy, High Pitch"
QUESTION: There is a black adjustment screw on these horns... is that something that can adjust the pitch of the horn?