Originally Posted by acadianbob
Trying to remember, but isn't this true only for a 7-pin? I'm thinking that a 4-pin doesn't have a hot wire. Maybe they are all 7 pin anyway . . . . but I've seen some people with 4 pin use an adaptor.
Any trailer with electric brakes (whether RV, boat, utility) will need more than a 4-pin connector.
Here is a chart that shows the common trailer connectors and the corresponding wire color codes.
If you read the part about the 6-pin connector being able to have the center pin used for brakes or auxiliary, I will verify that one. We have two gooseneck tire trailers with 6-pin connectors. I use an adapter that will allow a six pin round to be plugged into my trucks 7 pin RV spade connector. When you purchase these adapters, you have to read the package, as there are two different adaptors. I always have to buy the one the states the center pin is auxiliary.
I learned this lesson the hard way. I didn't look and bought one that said center pin brakes. I plugged in one of my trailers and the brakes instantly locked up. Problem is I had my trailer a long way from anywhere when I did this. I had to end up taking the trailers connector apart and rewiring it to get home.