wig wag flashers

i have been building this wig wag flasher set i found on this website but im confused what it means by 12V (+) from light switch. ( https://www.the12volt.com/relays/relaydiagram60.html anyone have an idea what this means? im really eager to get this installed in my car. thanks in advance

From the vehicle's light switch. It assumes you have existing headlamps that you want to flash. When wig-wag is off, the headlights connect normally to the vehicle's light switch via NC contacts 87a & 30. The "light switch" is (IMO) "beam power" - ie, the low- or high-beam.   This is after the dip-switched relays unless dedicated low beams - whichever is being waggled. With apols if I have misinterpreted. And not wanting to confuse, but FYI for consideration: Alternatives exist like using the feed off your hazard flashers instead of your own flasher can with hidden load (bulb etc) - hence it wig-wags only with hazard lights on. [PS - In retrospect, maybe not....] Or maybe use the relays in the gnd side of the beams - hence independent of the beam selection (but you must switch the beams on) BUT that might cause all beams to be half-on except for the side that is grounded. And it is better NOT to introduce ANOTHER switching pole - ie, if hard-grounded, keep it that way and switch the (already switched) +12V side instead.

i was going to hook it up to a set of aftermarktet fog/driving lights so i would just go to the switch for that?