You have it right so far the 4 way connector is just as you have stated. White ground wire.
Trailer Wiring Diagram Lights Brakes Routing Wires
Color code 4 wire trailer plug. By law trailer lighting must be connected into the tow vehicles wiring system to provide trailer running lights turn signals and brake lights. Following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing. Trailer wiring colors the worst that usually happens with screwy trailer wiring is a blown fuse on the tow vehicleor something wacky like reversed turn signals or blinking brake lights. Trailer electrical connectors come in a variety of shapes and sizes. Brown tail lightsrunning lights. Trailers longer than 15 feet and heavier than 1500 lbs must have a brake system that means another circuit for hydraulic brakes.
When youre troubleshooting the trailer wires be sure you do it one wire at a time starting by checking your ground wire with a circuit tester. Most of us arent electricians but that doesnt mean wiring a trailer or replacing corroded wiring is beyond us. 7 is the center terminal and currently is most. Yellow left turn lightsbrakes. Green right turn lightsbrakes. Trailer wiring color code explanation.
Standard color code for wiring simple 4 wire trailer lighting. On a 4 way flat connector like the 4 pole 60 inch long vehicle end 18002 that you have referenced white is the ground wirethe brown wire is for the taillightsrunning lights. Traditional trailer with brakes use a 5 pin connector. Remember that yellow has a l in it so that is the left side braketurn signal and green has a r in it so that is the right side braketurn signal. 1 4 wire the first 4 pins white brown yellow green just like the 4 pin connector above. Well walk you through the wiring process its easier than you think.
Use this 4 pin trailer wiring diagram to properly wire your 4 wire trailer plug. Blue electric brakes or hydraulic reverse disable see blue wire notes below in the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road. A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights. 7 way rv tow vehicle connector wiring color code color gage circuit function connector interior 1 white 10 common ground 2 blue 12 electric brake 3 green 14 tailrunning lights 4 black 10 battery charge 5 red 14 left turnstop 6 brown 14 right turnstop 7 yellow 14 auxiliaryback up note. Yellow is for left turn signal and brakes.
The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector.
Gallery of Color Code 4 Wire Trailer Plug
