Hopefully I have provided enough information since I am a newbie on generators. Here is what I have: A Honda EU6500is and a Rigid 5 ft 12/4 inline multi outlet generator cord. The cord cannot be plugged into the generator because the generator has a 3 prong (30 A) recepticle and the cord has a 4 prong plug. Can I make a short cord or long cord with a NEMA L5-20P on one end with a NEMA L14-20R on the other so I can use the Rigid cord? Is 12 gauge 3 wire OK? Any particular wiring watch out for if it is possible? Thanks