We can’t answer as to why the removal of a ground is causing an issue. The lights do flash in a slow rhythm from a timer, and they flash in fast succession when a box switch is left open. The ground removal is a new one to us, though if you pulled the random ground that fed the panel, you could have busted the open circuit. Thus we are still prone to check the individual switches that break one side of the feed. (One wire)
A panel could be bad, we think there’s more to this one so check all the switches for operation. They are or should be contacting when lids are open.
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