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A SPDT(single pull, double throw) switch is basically a toggle switch correct, but a common toggle switch you may think of has 2 terminals. when the switch is one way its on, when its the other way, its off. However in a SPDT toggle switch, there are three terminals. usually the center is the common, we'll call this on "C", Then the other two we'll call "A"(resistor 10 Ohm) and "B"(stock light sensor). In this switch, when the switch is one way, it will make a connection between "C" and "A" and thus deactivating you auto-on lights. When you flip the switch the other way, it makes a connection between "C" and "B" now, and in turn allows the photosesor to control the headlights automactically.
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