NA Miata Main Relay Replacement DIY

Miata not starting? Learn how to replace the NA Miata main relay with this easy step-by-step DIY guide. Save money and time!

Parts Required:

Tools Required:

  • none!

Instructions:

  1. Locate the fuse box under the hood next to the windshield washer bottle. Remove the cover by pressing in the tab and lifting up.
  2. Locate the main relay. You can reference the fuse box cover label, or just look for the big green relay!
  3. Remove the old relay by pulling firmly out of the fuse box.
  4. Install the new relay and re-install the fuse box cover.