Matt,

I have enclosed a link to a pretty good page of Signal-Stat diagrams. Maybe one will apply to the switch you have.

I'm not sure what you consider a parking light, but the only wires involved with turn signals would be brake activated lights for the rear and "turn signal" lights on the front...would the fronts be considered parking lights?

http://www.film.queensu.ca/CJ3B/Tech/SignalWiring.html

Stuart