I have a 2012 2500 LT, I do not have the turn signals in the mirrors but they are power mirrors. I am thinking of replacing my existing mirrors with the bigger tow mirrors. My question is, does the harness for the power mirrors already have the turn signal in it or is that a separate harness all together? Thanks guys. Be Blessed.

 

All you have to do is buy the mirrors. It's plug and play for the signals in them. I believe 03-up are that way.