I bought a 30A 100' 10g wire power cable to run from the shed to the trailer. I've got a 50A to 30A adapter at the shed, and an adapter from the 3 wire cable plug to mate with the 3 prong hook up on the trailer, which uses the 2 "bent" connectors (hot and neutral), along with the 'flat' ground. I'm getting 120v at the hot connector on the cable there, with 0 on the white/neutral. All good up to this point.
But when I try to take readings at the breaker box on the inside of the rear wall where the input is, which is only about 18" of main wire between the outer socket and the breakers, I'm getting no voltage coming out of the breakers, and power only coming into one of them. Something else I don't quite understand is that there are 4 wire's coming into the box. Black and red, which I would normally say are the hot wires, one feeding each of the two breakers, a white neutral and a green ground. How can there be 4 wires coming off of a 3 wire prong? At first I thought, well maybe one is feeding the converter to charge the batteries??, but both the wires are feeding into the inputs of the two breakers in the box.
These two breakers are both T&B breakers. One is a 30A single pole SR-100 type TB, and the second is a 20A double pole YF-6738 type TBBD.
so I was just re reading this and I think you have more going on than breakers, and they may not be the issue, or at least only a small part.
10amp extension cord isn't rate for 30 amps over 100 feet, at that distance it is only up to 20amps.
RV 50amp outlets have 4 cables, two hot, one nutral and one ground. the reason for this is it is real two 120V circuts not a 240V, so you need the nutral. it would be handy to see a picture of the two wires you are talking about that are feeding the panel breakers, both at the panel and where they start. once you get into a RV the colors can be what ever the manufacture had availble at the time 😁
