Connectors - I have really fallen in love with PowerPole connectors.
They are robust, don't disconnect inadvertantly, and are infinitely
variable as to configuration or the number of connections. See my
report at http://chicagolandglidercouncil.com/...etterNov11.pdf.
See instructions at http://www.wb3w.net/powerpoleinst.htm.

As to loosing the wires in the wing. I assume you mean that if the
connector is not connected to something, then the wire might fall back
into the wing. It would make sense that you need to tie it off to
something much the same way as water bags are tied off. Add a string
to the connector/wire and tie it to something. I am not familiar with
the Pilatus but I believe that it is all metal so a simple sheet metal
screw into a rib might work. Otherwise an adhesive cable tie anchor
would be less instrusive (http://www.amazon.com/B1PSSM100-1-Inch-
Adhesive-Screw-100-Pack/dp/B005LTJ4PW).

Good luck and be sure to report back (with pictures).

- John