I JUST RECEIVED A WARNING FROM HUMMER THAT SEEMS VERY SERIOUS FOR ANYBODY WITH A TRAILER.. I AM SETTING UP MY H2 FOR A HORSE TRAILER AND IT SEEMS THAT THERE IS A DANGEROUS PROBLEM. IT SEEMS THAT THE TRAILER BRAKES MAY NOT ACTIVATE SOME TIMES AND WORSE WILL ACTIVATE WITHOUT STEPPING ON THE BRAKE.. ANY COMMENTS?

Did you the right pigtail?

I just had mine wired up and my RV guy told me the GM plug 02 to 03 changed. If you are using an 02 pigtail, that could be your problem.