Re: Convertible Top Switch
You drew the schematic correctly. The 87a terminals (normally closed) are simply not used.
If one wanted to alter the wiring so the top can only be operated with the key "on" , the main power into the actual switch would be tied to a switched ignition source like the the IGN slot on the fuse box rather then tied back into the main incoming power.
K.R. had some excellent advice, however even if the system is operating to proper specs, the original design was sub-par and done so for cost savings. By not using relays, the full load of the motor windings is flowing thru the switch contacts. Even with heavy duty contacts, motors represent an inductive load which causes a nice "arc" with each operation which pitts the contacts causing premature failure. This is the same reason for all the issues with the factory blower switches in the HVAC control panel.
-If you don't stand for something, you'll fall for anything.