Maybe I'm blind.... but I only see the one hinge, upper left door......regardless that hinge is not touching door mesh and wood is an insulator.
Wonders if you could tie a wire to mesh on hinge side of door to a grounding rod?
That on the upper left is the hook. There's a strap hinge up at the top right and one almost at the bottom right that's hard to see in the picture. I bet you're right in that all that 2x4 fencing there is insulated just being stapled to the door. Maybe I could put a piece of hardware cloth across there at the top of the door and run a wire down to a grounding rod that's out of the way. This is the first electric fence I've ever put in, so I probably need to rethink the whole thing. Howard E, all this info is appreciated and I'll do some more testing in various places with my tester and go back through all this when I re-design. I was basically concerned about my neighbor's cats and figured once they got popped once, they'd never bother the chickens again and I could just turn the thing off after a while seeing as how I live in the city. That was before I found out that a whole family of raccoons was eating my neighbor's cat food every night and just living high on the hog!