Aaand, THIS is why I use glasses, and check things with a meter... Seems I was incorrect about the Williams board having the center 2 wires both connected to "hot" (there's a fine space between the pads for the center 2 pins of the socket, which I didn't see at first). One of the center pins connects to the engine's frame via the screws that hold the board in place. Figured it would be like the MTH boards which have a wire connected for common, but no. Good thing I figured that out before applying power! Of course, it saves me drilling and tapping for a grounding screw on the tender. Now to figure out what size those teeny, tiny screws are that hold the shell on the tender so I can order nylon ones and isolate it.
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