HH56 wrote:
Did not see any mention or any wiring diagrams for a trunk lock release mechanism in the 58 Stude supplement but does the mechanism look anything like the item in this photo? If so they may have used the same solenoid Packard installed on some 4 door models in 56 to lock all the doors at once.

If that is the case the solenoid is one action only. When it gets power the plunger pulls a link rod attached to the latch mechanism. In Packard use it locked the doors but Stude may have used it to pull the trunk latch release mechanism just as turning the key lock would do.

There is probably a push button located inside the car that activates a relay. In Packards case grounded pushbuttons were under the dash edge at each end. When either was pushed it supplied a ground to another horn type relay located in the engine compt and when the relay closed it supplied 12 volts to the single wire on the solenoid. The solenoid ground was provided by having the assembly bolted to the body sheetmetal.