Regular headlights, contrary to popular belief, are mostly so other people can see your car. They can illuminate the road ahead of you, but the vast majority of drivers are in a well lit urban-suburban areas. That reflected light is for the most part, going to come from city lighting sources.
Having said that, you want your regular headlights on whenever it's cloudy or during any precipitation
If you're in an unlit area, on an undivided road, flip your fog lights off for oncoming traffic. You don't want to blind the other driver. The etiquette rules for fog lights are the same as for bright-high beams. It is for this reason that we present here the proper way to wire a fog light systems. Inhere we also present the two methods of connecting or arranging the fog light, which is positive or negative trigger.
Let's analyze this circuit:
We can see the two separate circuits, which are meant to be studied .... Get the whole story right now in this video...Enjoy...