davea180

The OP cannot have a trailer prep group added at this point. I read from his post that he is interested now in trailer wiring.
BTW, and I have no explanation for this, my SXT DOES NOT have the trailer prep and it does have an engine oil cooler as is listed on the window sticker. I don't recall seeing it as a part of any "group." I do believe that if you are speaking of a TRANSMISSION oil cooler, the 6 speed trans may come with that standard and its easy to check and see it behind the grill.

Is this on a 2014? Wouldn't doing something like this affect your warranty? Also, I would think the loss of backpressure would affect factory set system specs. in the engine and emission controls.

All-
I have figured it out and have my Prodigy brake controller installed. I used the Dk Green/White wire referenced above in the quote by harryj. I used a relay with a diode to prevent a voltage surge and it works perfectly with my Jayco popup. I just got home from my maiden voyage test drive and aside from some brake adjustments all is good.
I did take some photos, if there is enough interest I can do a brief writeup.

Is this on a 2014? Wouldn't doing something like this affect your warranty? Also, I would think the loss of backpressure would affect factory set system specs. in the engine and emission controls.