Why do I have brake lights but no running lights on trailer?

Working Running Lights, But No Turn Signals or Brake Lights On Trailer You will first want to check the fuses on your tow vehicle. Some vehicles could have fuses for operating the turn signals and brake lights of a towing package. You will want to check if they are installed and working properly.

What color is the running light wire on a trailer?

Trailer Wiring Has 5-Wires White, Yellow, Green, Yellow/Brown, and Green/Brown 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.

How to troubleshoot no running lights on trailer but turn?

Testing the truck’s connector tells if the problem is on it or the trailer. If everythig checks out here then the issue is on the trailer side. If you have a problem on the truck then you need to trace the wires coming from the connector looking for any damage. You should also check the ground connection making sure it’s clean and solid.

Do you need to hook up trailer lights?

Depending on whether the trailer lights were purchased as part of a kit, electrical wires may already be connected to the power leads. If the lights will need to be turned on and off without physically disconnecting them from the battery, it will be necessary to install a toggle switch.

Why are the running lights on my truck not working?

The truck has the factory plug to attach to an after market female receiver for the trailer wiring. I swapped the after market receiver out with a new one and it is still acting the same way. I had my neighbor hook his truck up to the trailer and all lights work as they should to rule out an issue with the trailer.

Is the trailer running light working on my 2011 Silverado?

The trailer running lights stopped working when hooked up my 2011 Silverado, however, the brake lights and turn signals are working fine. The truck has the factory plug to attach to an after market female receiver for the trailer wiring. I swapped the after market receiver out with a new one and it is still acting the same way.

How can I check the wiring on my trailer?

Check the trailer wiring by running a continuity test by connecting a jumper wire to the connector pins and a continuity tester to the sockets. Connect the jumper wire to one of the pins in the trailer socket. A continuity tester contains a light bulb and a battery.

Why are my running lights not working on my truck?

If all fuses and relays are good then the problem is somewhere between the trailer connector at the back of the truck and where it terminates at the front. You can use a circuit tester such as # 40376 to test the truck side trailer connector. If there is no power on the running light pin then check the back of the connector where the wires attach.

What do you need to know about trailer side connectors?

If that’s the case, inspect the trailer side connector for any debris or corrosion built up inside the pins and check the all the ground connections – both the main harness ground and those for the individual light assemblies on the trailer. Let me know what you find and we can keep troubleshooting if needed. 70869