Are your brake lights working? If they are and you have the resistors connected between the ground (black) and positive brake light wire (blue) then I don't know what it could be but I have heard of people having problems with some of the cheap China-made Ebay LED taillights. Also make sure the wires are actually making a good connection to the resistors.I found some 10ohm and installed according to the first post and still do not have cruise control. Any other ideas on what could be going on?