Trans wiring help!

[sixpack_sid]

I have a 68 Charger and I'm trying to figure the wiring to the trans. The trans I am putting in is from a 77 New Yorker 440. The plug that I found with my wiring for the 68 is a round plug with 2 female end and 2 blue & yellow wires going to it. The plug on the 77 trans is a 3 prong male end. The female 2 prong doesn't seem to fit into the male 3 prong on the trans. I did get the original 3 prong wire with the 77 trans. Can I use this wire and where does the other end plug into?

[Nacho-RT74]

since mid 69, the NSS was changed to 3 prongs to drive there also the back up light. Earliers are just one prong to simply provide the ground to the starter relay on P or N.

on 3 prongs NSS the MIDDLE ONE is the one what feeds the ground directly to the starter relay. The outer ones drives positive, being one of them energized allways from fuse block ( while running ), the other one is energized when set in reverse to feed the back up lamps

[John_Kunkel]

The plug that I found with my wiring for the 68 is a round plug with 2 female end and 2 blue & yellow wires going to it.

That's a manual trans BU light harness.