4 Pin Round Plug Wiring Diagram. You must check the trailer manual to see if the wiring is correct but normally the white wire is called the ground wire while the brown wire is used for tail lights. 7 pin to 4 pin trailer wiring diagram sample.
Here is the diagram for 7 pin connector. Check with a test light or vom. There are four types of data rates in usb cable.
White pin for the floor.
Below is the generic schematic of how the wiring goes. Get instant quality results now. This article will be talking 4 round trailer wiring diagram. 4 pin mini connector.