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Maybe the coating on the board is for waterproofing it. My fish finder's board is dipped too, it's to protect the board from corrosion. That stuff more likely traps heat than conducts to the housing. Maybe a failing component heats up in there which causes a short or open. Also possible that...

A lot of great information RLMguy. Thanks for posting for us fellow sufferers. How do you know that little skin tag on the soon to fail drive controller is a thermistor? mine has 3 gray wires, the battery thermostat has 2 wires and is easy to test. Were you able to detect any damage inside...

Nope, it was not in amp mode. It was on DCV-200 (next level down is DCV-20). I know I've used my self ranging DMM on 12V systems with the red lead still on the 10A fused link without ever problems. Didn't even damage the DMM, just the mower. But I checked youtube after the zap and apparently...

I had to join after reading your post. My first post. I had almost exactly the same thing happen 2 days ago on my 480e, down to the capacitance drain at the key panel and complete dead system. Mine was totally my own fault when I was checking voltage at the charge port and left the red lead...