Mystery wire in headlight harness

Please review the attached 68 drawings. The hood turn indicators and front turn light on driver side are from the S Terminal are black with light green trace.

Go to this harness photo and show me where it comes from the "S" terminal and are Blk/Gn on the diagram.... It clearly shows Green / tracer and coming from the "Z" terminal the OP listed as the source

http://www.mymopar.com/downloads/1968/68DartB.jpg