So you are saying to run a wire from the switch but tap in to the wire that is going into the switch rather the the out one? And then attach that wire to the lights like others have done?
Assuming you have all of your pass through wires connected together, just use a T-Tap to tap into the wire for, say, switch 4. That way when switch 4 is on, the parking lights would be on. Also, if you had any LED lights on switch 4, it will have those lights on as well.
For example, I run a set of Apollo Optics amber and white fog lights. They are tied to switch 3 (white spots) and switch 4 (amber floods). I turn off my white spots at night and at dusk/dawn because of how bright they are and always have the amber floods on. So I would run a wire from the parking light wire to the wire for switch 4. That way, my parking lights would always be on when my amber floods are on (which is 100% of the time).
