[MitchSF]

I don't think the hardware and software would be too different from the convertible top project. Both monitor the duration of time a switch is closed. Based on that the convertible top holds the switch contacts for a period of time that allows the top to close. The blinker would close the switch long enough for three blinks only.

If both switches control relays with approximately the same current draw, maybe the hardware would work as designed for the top project.