How do you instal a relay for twin horns?

To install a relay for twin horns, first, disconnect the vehicle battery to ensure safety. Connect the relay's terminal 30 to the battery's positive terminal and terminal 87 to the positive wire of the twin horns. Attach terminal 86 to a switch or the horn button and connect terminal 85 to the vehicle's ground. Finally, ensure all connections are secure, then reconnect the battery and test the horns.