Have you taken a look at the wiring harness that runs along the left hinge in the trunk? Seeing as how that section of wiring flexes everytime the trunk is opened or closed it's been known to break. And the break may not be visible for the conductor as the outside wire insulation is intact. Does your trunk light work normally? Somethings to look at before you make it more difficult for yourself. If you have a multimeter..aka volt meter you can measure for voltage at your trunk release switch below the dash. If you have it there...then it's a good sign there's a break in the wiring somewhere between the switch and the trunk release solenoid. Inspect the wiring carefully near the hinge.