The charger is working, there's a light that flashes, and it's clicking.
The fence worked in one spot right by where it's hooked up, and then not in another spot right near it. Then further down the fence, a similar thing happened. It might just be the tester. It's really old.
I have 2 strands. The donkey's gone now, so now I just have to hope it keeps my colt in.
It's run on a car battery, so it's not plugged in anywhere.
Thanks for all the help, though.