I assume you have the built in factory brake controller? When you check voltage at the back pin have someone depress the brake pedal or squeeze the slide switch. I assume you have set the gain up from zero? You do this by the push buttons next to the manual apply switch. If none of these things help your probably going to need to have a dealer look at it. I know GM had some problems with the rear control modules on the early 07's.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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