To install a marine horn, follow these steps:
1. Mount the horn underneath the boat on a frame rail.
2. Connect the horn to the wiring system using a relay to reduce the load on the switch and wiring.
3. Ensure access to the horn mounting area by removing panel retainers.
4. Lift the cover panel out of the way.
5. Securely connect the wires and ensure proper wiring instructions are followed.
Overall, installing a marine horn is easy and can be done manually with the provided harness package.