4 Wire Trailer Plug Wiring Diagram Lighting. The suggested minimum for the ground wire is 16 gauge. Click on the image below to enlarge it.
In some cases and more often in europe the trailer light will be connected using a 13 pin plug and socket. Utility trailer 03 4 pin trailer wiring and diagram watch later watch on installing the 4 pin trailer wires 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. If you have a 13 pin socket fitted to your vehicle adaptors to plug in so you can use a normal 7 pin plug are available.
1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above.
Note that this type of 4 pin connector is less common that 4 pin flat connector. Back up lights ground 7 way pin style trailer side 7 way rv blade style trailer side 6 way round trailer side 4 way round trailer side 5 way flat trailer side 7 way pin style car side wire color key 7 way rv blade style car side 6 way round car side 4 way round car side 5 way flat car side ground right turn brake left turn brake taillights ground right. The first diagram is a simple set up of two brake lights two indicators and two side lights. The minimum suggested wire size for a 4 way trailer plug is 18 gauge for the turn brake and running lights.