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Nice find, Jay.
That is one of the reasons we would like the inspectors to do an ohm check from battery terminals to robot frame during inspection.
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I did this when I was inspecting at the SCRRF scrimmage. It's not hard to do, even an ME like me can read an ohm-meter, and it only takes a few seconds. But I found at least one robot grounded to the frame. The team was very surprised, but they realized the trouble it could cause and got right to work on finding it. I hope they did eventually. I never heard one way or the other.
Maybe we should ask that an electrical check station be added next year at the Team Forum? After all this can be the result of repairs or inadvertent happenings and so would not necesarily be picked up by the standard visual check. Since it's a pretty clear cut type of thing I wouldn't have a problem manning it with volunteers from teams at the regional.
I HATE it when the magic smoke gets away, especially in the form of sparks!