In article .com, "Harry K" wrote:
With three cables, you should have 9 wires not 6. There should be a
ground wire with each cable. Will a GFCI even work without a ground
wire??

Yes, it will. A GFCI senses the currents on the hot and neutral, and trips if
the difference exceeds a preset threshold for a preset duration. IIRC, the
threshold is typically 20mA for 10ms.