Let me say right off I did do some searching and I found and read the big towing thread at. That said, I've got a '07 with a dealer installed tow package, so it's got the hitch, and 4 pin wiring, also it's a Canadian truck so from my other research it's got the big battery and alternator of the factory tow package.
What I'm wondering is has anyone figured out how to hook up the factory wiring? The brake controller 4 pin harness has 4 wires, the fuse box has all the 30A fuses and the relays indicated as towing related yet the brake controller harness only has ground and the brake light pin as apparently hooked to anything. I can't find any wiring at the back under the truck either that looks like tow package beyond the existing 4 pin.
Now I have a brake controller, 7/4 pin plug, breakers and a bunch of 10ga wiring on the way to install as per the usual method but I'm just wondering if I can save some work by not running redundant wiring that's already in there somewhere and just needs to be hooked up.
Basically has anyone figured out how much wiring is missing, both into the cab then from the cab to the bumper? Especially when all the fuses and relays seem to be there.
Also, as for the tranny cooler, I plan on installing one and a trans temp guage in the near future, but for now I sometimes tow a tandem axle enclosed utility with a GTW of about 2700lbs tops which is sketchy with no trailer brakes. When we have it loaded right up we tow it with a Navigator.