Reply To: What is this?? Mar 11, 2024 at 6:36 PM #12555 Sid👤 Member🖊 Topic Author Topics: 2Replies: 14 Hi I found where this wire plugs into and it is part of the harness. And I guess the Yellow end go’s to earth But what it does I have no idea The diod reads 240v AC With 2 one way resistors.