Want to add the rear marker lights on my 2012 SD like the 350's have. Is there already a lead there to plug in to already or do you have to tap into the harness. If you have to tap into it does anyone know which wire and where is best?
I installed mine a couple years back, I used the trucklite brand (#15745 I believe... ~$20 at Napa) and it fit perfect on my 07. I cut the wire to the driver side plate light and then joined the new wire in with a reducing butt connector, then heat shrink and wire loom, looks just like a factory install under there. I love how they dress up the rear end!