4 Wire Flat To 4 Wire Round. A four-slot outlet has a fourth slot that is dedicated as an equipment grounding conductor. Well you're in luck, because here they come.
On sale and ready to ship. The ground and neutral pathways are separate, reducing the change of accidental shock. USB cables are perfect for this.
Did you scroll all this way to get facts about flat wire?
American wire gauge (AWG) size calculator and chart.
The red and black wires go to the outer two terminals (in the photo the dryer wires are black and blue). Well you're in luck, because here they come. If the trailer has incadescent bulbs you may overload the trike wiring unless you use an isolator.