Buzzer alarm on light switch ??

[MARKDTN]

It would be pretty easy to make your own headlight reminder with a typical “Bosch” cube type relay and some sort of 12V buzzer. Ground to terminal 86 and the ground side of the buzzer. Ignition power to terminal 85. The + side of the buzzer to 87a and marker light power to terminal 30.
If you turn the markers or headlights on without the relay energized, then power flows across the normally closed side to the buzzer. If the ignition is on, then the relay is in the open position and the buzzer will not sound regardless of if the lights are on or off.
A relay and timer system could probably be made for automatically turning them on and off like modern cars, but you would need higher amp stuff. Might be easier if you already had a headlight relay kit, then you could do some trickier stuff with the relay trigger. You could use something like this in “delay off” mode
https://www.12voltplanet.co.uk/adjus...f-12v-10a.html
with ignition power to terminal 15 and battery power to 30, output to turn the relays on from terminal 87, and ground to terminal 31.
So when you turned the ignition on the headlights would come on and stay on for 10 seconds or 60 seconds after the ignition was turned off.
Littelfuse also has the KSDB series delay on break timers available in 12v which have several different delays or methods. It would wire similarly if you already had a headlight relay kit. All of these I would add fuses that are not mentioned in the wiring to protect the system.