I had Ongaro on my other boat. It was going strong after 10 years. However, regular service of the contacts was required. Another periodic maintenance item.
[/QUOTEl] Great tip, knotflying. One of my Marincos quit this spring. Basic troubleshooting revealed power all the way to horn contacts. Marinco was nice enough to instruct me to clean the contacts with a piece of fine sandpaper. Bam, back in business. If / when it happens again, 6 or 8 screws and you're back in business.
They look like contacts on a set of points. If your horns aren't working, start there for free, and disassemble carefully so the wiring is not damaged. Put a rag under them to catch the screws and washers.