Which wire is which?

[rmhowell]

I purchased a Geeetech reprap extruder with hot end connection assembled but both of the wires from the hot end for the heater are red with no indication of which one is the ground cable. How do I determine the ground from the power cable without damaging the rest of the printer?

[Mark]

no need to worry about that, there's no ground and power for the heaters, just connect them and it will work.