Thanks folks... you some of you got me, i meant cummins, I just didnt know yet. I have only towed with this once and I did try to pull the knob but I did not feel, see or hear anything different. The little LED light came on. I did not want to mess with it again until I found out what it did.... Maybe I just did not know what to look for.... this is my first diesel.
The unit in the video is exactly what I have but I have an automatic transmission. Thanks again everyone, this saved me a trip to a diesel mechanic or something to try to figure it out... I have a nearby hill with a prefect grade to test this thing out... Will it only work if I am towing?
