Towing Mirrors on 17 Tundra

I purchased power extendable towing mirrors for switch over on my 17 Tundra.
They come with harness, front signal & running light, heat & power.
NO folding or puddle lights. They do have tow Rear facing LED on each mirror which I can connect to Reverse or Interior / cargo lighting.
I want to tap into signal light wiring and fab red tiny acrylic covers for rear facing signals.

Ground is given but which color wire do I tap into for signal??

 

I am thinking about getting the same mirrors for my 2017 Crewmax. Are these OEM? Can you send a pic of your rig with them on?

 

Sounds like I got same ones. I tested & taped into right & left signal and converted double Courtesy / Reverse light into rear facing signal then placed red len over them.
here is hopefully picture attached. First time ive tried this on the forum??
FYI Tip when testing mirror harness I used needle in each pin hole as tester was too large to fit tiny pin holes.

 

Are these power folding mirrors .?

 

No not power folding, just power adjust, heat and signal.
Took courtesy light and wired it to be rear red facing signal for lane changes.