How do you change the main relay on a 1999 Mazda miata?

To change the main relay on a 1999 Mazda Miata, first, disconnect the negative battery terminal to ensure safety. Locate the main relay, which is typically found in the fuse box under the dashboard on the driver's side. Carefully remove the relay by pulling it straight out, then insert the new relay into the same slot, ensuring it is seated properly. Finally, reconnect the battery terminal and test to ensure the new relay is functioning correctly.