I just purchased a 536 a couple of weeks ago. I'm just getting up to speed with it, but have been pretty happy. I also purchased a BC-GPSK to use when traveling. The problem is when I put the scanner in the car it doesn't power up. The attached GPS does. I've tried the other standard 12V adapter without the GPS, also with no success. When I bring the scanner back in the house, it works fine. I've double checked both 12V ports in the car with other devices and they work fine. Am I missing something really basic here? I hope this isn't a topic that's been covered over and over again. I'm new to the forum. Thanks in advance.