Quoted from Pin_Fandango:I want to do this to my IJ and been practicing to crimp two cables in 1 cable and I failed miserably... wondering what the technic is... I am considering running a 3rd cable from the switch and use a 3 pin connector instead... but it is more work...
Twist the wires together then crimp.
Use a proper ratchet crimper and it makes a positive connection.