Slick117 or the Kaptin can both test them, and that would be the next step. I had one a couple years ago that didn't look like it was working, and Marky told me to hold the wires together to reset it, and it worked, and still working. I have several Dogs that come to my shop that still have the original EHC in them. They really aren't as vulnerable as rumored. I changed one because of a broken pin, and the rest were due to cheap batteries shorting out.