Note: This guide only covers most 15, 20, 30, and some 50A power cord / adapter applications. 4-Wire, 4-Pole applications are different and will be covered in another article!
Many of you have made your own RV / generator power cord or adapter using assembly ends like these, and just want to make sure that you have done a good job before you use them. For this example let’s assume I am wiring an RV, 30A to 15A adapter like this finished example.
What we want to do is make sure each wire was connected to the proper terminals on each side of your cord and the right color wires! Like this example below:
First, you want to buy a Multimeter. I am starting with a pre-made ROJ adapter from Conntek. And want to test it to make sure that it is wired properly, and to find the right wires to connect.
Now that you have everything all set up. Start your multimeter by turning the center dial to the “Alarm,” setting circled in red. This setting will make a noise when you place the meters’ probes are touching the same wire.
Now that we know a little more about what we are doing, it’s time to start testing.
Our first test is for the ground pin, “Green.”. We stuck a pin into the round opening (most common shape for ground pin), got a beeping noise, and a small reading. We know that our current end is wired properly to the right wire.
Now you know what wire to run to your ground terminal of the other side!
We wanted to make sure our Neutral wire, or “White,” was wired correctly. We stuck a probe into the lower pin and to the white wire, resulting in a beep / reading.
Good! We found our neutral wire.
All you have left is to check the last wire. If all goes well, it should be the black Live “Black,” opening to the black wire. Now you are ready to wire the other side of your 3-pole cord.