I cracked the code on the horns.
I was working on getting @Tirnipgreen's re-plated horns working. I tinkered with them some a while back, but I needed some time to focus on them to get the bugs out.
Fortunately I had one of my old 260Z horns that was unmolested to use as a template.
Before I go into detail, let's talk about the theory of operation.
When you press the horn button, the relay sends voltage to the horn.
The coil in the horn is energized, pulling the dia