Hi Dick,
My Avionics kit was received in about January of 2010 and the ELT connector has a blue wire. Its my understanding that our RV-12 kit ELT's don't do anything with the GPS data, and that Van's had just been thinking ahead when they decided to wire for it(It may come in handy one day having that shielded wire ran back there with GPS data).
I am curious if you have a different colored wire, or no extra wires? If you don't have anything to connect your shielded wire with GPS data to, then I would be certain its shield is stripped back atleast a 1/4" so it can't come into contact with the center conductor and then heat shrink the entire end.