The first two wiring systems I thought of that could be used for a "Pop-Top
Ajar" alarm are the seat belt  and the driver's door open buzzers.  Either
could be used to alert the driver when the keys are in the ignition (door
open system) or when the engine is started (seat belt system).  The seat
belt buzzer would stop after a few seconds, the door ajar would continue on
until the top was closed.  It would not be to hard to pull a wire off of
either system and run it to a micro-switch up top at the latch.    Both
buzzers are nuisances anyway!

                                                                        Jay