How does a car using combined stop/tail lights wiring know whether to run the stop or tail lights? I am trying to separate these as an electronics hobby to connect to my
![Amazon.com: Right Angle 3-wire Pigtail for Sealed Trailer Stop, Turn and Tail Lights - 2 Pack : Automotive Amazon.com: Right Angle 3-wire Pigtail for Sealed Trailer Stop, Turn and Tail Lights - 2 Pack : Automotive](https://m.media-amazon.com/images/I/41VvqwlncnL.jpg)
Amazon.com: Right Angle 3-wire Pigtail for Sealed Trailer Stop, Turn and Tail Lights - 2 Pack : Automotive
![Amazon.com: LINKITOM Trailer Lights Welded Mount Steel Boxes Kit w/6 inch LED Oval Tail Lights & 2 inch LED Red Round Side Lights w/Grommet wire connectors, 2 Pack : Automotive Amazon.com: LINKITOM Trailer Lights Welded Mount Steel Boxes Kit w/6 inch LED Oval Tail Lights & 2 inch LED Red Round Side Lights w/Grommet wire connectors, 2 Pack : Automotive](https://m.media-amazon.com/images/I/71No0NEcNcL.jpg)
Amazon.com: LINKITOM Trailer Lights Welded Mount Steel Boxes Kit w/6 inch LED Oval Tail Lights & 2 inch LED Red Round Side Lights w/Grommet wire connectors, 2 Pack : Automotive
![85 Chevy Truck Wiring Diagram | typical wiring schematic / diagram for 1973 - 1987 Chevrolet Truck ... | Trailer light wiring, Tail light, Chevy trucks 85 Chevy Truck Wiring Diagram | typical wiring schematic / diagram for 1973 - 1987 Chevrolet Truck ... | Trailer light wiring, Tail light, Chevy trucks](https://i.pinimg.com/564x/53/f5/a3/53f5a301252d68ba30f345473b559bbe.jpg)