Is this the emonPi you can’t get working?
Explain. The cable is permanently attached to the SCT-013-000, so you can’t have swapped this part. Is there something else?
Have you carefully inspected your c.t? Is it damaged? Are the two cores intact and not cracked? And the cable - does this show any signs of damage? If you’ve got a multimeter, measure between tip and sleeve of the plug. You should see about 110 Ω.
Are you sure? Have you got anything else you can test the c.t. on, like an electric kettle?
Do both inputs of the emonPi give the same (within a percent or two) reading? Remember to do a controlled power-down and power-up with the c.t. connected when swapping the inputs. Rebooting the Pi does not reset the ‘emon’ front end.
A 240 Ω resistor in series with the a.c. adapter will give you a little less than 50 mA, that is, plugged in to the c.t. input, the emonPi should report 100 A (24 kW) or thereabouts. A higher value resistor will read less, of course.