4 Pin Plug Wiring Diagram. For example Cobra 4 Pin radios are wired 1 Shield 2 Audio 3 Transmit 4 Receive while Midland 4 Pin radios are wired 1 Audio 2 Shield 3 Receive 4 Transmit. Note that this type of 4-pin connector is less common that 4-pin flat connector.
Some trailers come with different connectors for cars and some have different wiring styles. Collection of 7 pin to 4 pin trailer wiring diagram. In the Trailer Wiring Diagram and Connector Application Chart below use the first 5 pins and ignore the rest.
4 pin trailer.
4 pin trailer wiring diagram This type of connector is normally found on UTVs ATVs and trailers that do not have their own braking system. The simple diagram for this connector is very like aforementioned types. If your truck has a built-in 7-pin socket but you only need 5 of the pins. If the problem persists you may need to rewire your trailer.