Turn Signal Switch wiring

[Jardin]

I installed a camera system on my 5th wheel trailer.  It has side blind camera's that run off a 12 volt trigger.  So I turn my right blinker on the right camera will display.  I under stand the signals probably run off PWM signal from the switch.  Here is my question what are the wire colors for the turn signals that come from the turn indicator switch before it gets to the bcm?  In an older vehicle I would take the 12 volt signal wire that goes into the flasher.  Hope this make since.  Any help would be great. 

[silveradosid]

new trucks send a ground signal to the bcm for the signals