While the basic configuration is a 4 way flat connector that features one female and three male ends you may come across connectors with up to seven pins for additional functions that require wiring including electrically actuated brakes power source for a winch etc. Well walk you through the wiring process its easier than you think.
Trailer Wiring
Wiring lights on a trailer. On a 4 way flat trailer wiring harness white is the ground brown is running lights yellow is left turn signal and green is right turn signal. Some trailer builders just connect this wire to the frame then connect the ground from all the other lights and accessories to the frame as well. What is blue wire on trailer lights. It is referred to as such as the system needs a mere four wires for the trailer tail lights turn signals and brake lights to illuminate. Also it must connect with things if included that use the aux power and back up lights too. Wiring trailer lights can be a big task and you want to get it right.
So here i have an older trailer which needed some work along with re wiring the lights. This is a fairly simple setup no license plate light or clearance lights. How to wire trailer lights. The trailer wiring diagram shows this wire going to all the lights and brakes. Electric brakes sometimes this will be black wire in a double wire cord with the white. If the lights on the tester function properly the problem is the trailer lights or harness and you need to some trailer lights troubleshooting.
The 4 way system is designed so the right brake light wire and right turn signal are green. Check for broken wires near the connector. Though trailer lighting systems are available in an array of configurations the most popular is the 4 way system. Learn step by step how to wire trailer lights in no time with this tutorial. Video tutorial on how to wire trailer lights. Lets see what types of connectors the trailer light wiring industry uses today.
A 4 way plug connects your trailer and tow vehicle and provides the required running lights turn signals ground and brake lights. This is accomplished by tapping into the tow vehicles electrical harness to transfer power to the trailer wiring system. Most of us arent electricians but that doesnt mean wiring a trailer or replacing corroded wiring is beyond us. Clean the connector photo step 2 below and check again. By law trailer lighting must be connected into the tow vehicles wiring system to provide trailer running lights turn signals and brake lights. Be sure to check with your local law.
If you still have problems make an appointment to have the wiring checked.
Gallery of Wiring Lights On A Trailer
