Unless you are wiring a separate third brakelight, no diodes are needed. There will be a separate feed for the indicators if used, one wire for left and one for right from the flasher. You will need a dual filament, socket and bulb because one wire is tail light and the other brake/flasher. Amazon has a 12 volt HD diode that you can use when doing the third brake light.Easy connect, two inputs one output!
