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Define "Main Switch". Do you mean the main headlight on/off switch? And what do you mean "What happens"? Well all the lights on the car turn off like they're supposed to. What else would you expect to happen?

For the case where the car *did* have daytime running lights, there is a switch (just like all cars) that turn on the headlight circuit. This also lights the dash and marker lights.
Hope you get things sorted out!