That's the inherent problem with that product. Since you don't really know when or not if it is transmitting its difficult to troubleshoot the problem you are having. Here is some help- as your rig is sitting in the driveway, with the receiver in its proper position on the dashboard, go partially unscrew one of the sensors enough to trigger an alarm. Then go see if the receiver is showing an alarm on that tire. If it is, I would think that would be a good indication it's gonna work going down the road. I have the same unit it's the Hawks Head brand. It works for me and I'm sure it will alarm to a tire problem, but I don't like the fact that it sometimes takes many tens of Miles for all the readings to update. Some of the other brands continuously send out signals and the operator has ready access to the data at any time which of course would make troubleshooting reception problems a lot easier.
