If your 80-86 Mustang is like mine, the bakelite connector block that plugs your wiring harness into your headlight switch has crumbled and cracked. But good news! Motorcraft is now offering a replacement pigtail kit to fix the problem! Seems that the newer Mustangs went back to the old style and it is now avaiable through your Ford Parts counter under Motorcraft Part Number WPT-165.