My horn stopped working and my radio is barely audible but still has power. I assumed it was a fuse but that didn't fix the problem. The horn and radio are on separate fuses also. Any ideas?

Remove and fully charge the battery:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-10.html#post1973613