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Troubleshooting Non-Working LED Running Lights on 34 Foot Trailer Although Brakes Lights Do Work

Question:

On my 34foot eclosed trailer. I have no running light, but the break lights will work

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Expert Reply:

A good way to start the troubleshooting process is to test the 7-way on your tow vehicle. Looking at the outside of the connector, the pin in the 1 oclock position is for your tail and running lights. Using a circuit tester such as # 40376, make sure that pin is receiving power. Also check for corrosion or damage to the pin because either of these situations can hinder the flow of current. If your connector is not receiving power check the tow package running light fuse, it may have blown.

If that pin is not receiving power then you know the issue is within your tow vehicle. Check the backside of the connector in the 11 oclock position and make sure your wire is attached securely. If all is good with the connector then it is time to visually inspect the wire for nicks that have exposed copper. If you find such a break in your wire, electrical tape will do the trick. If you do not find any nicks check your ground wire.

The ground should be attached to a clean, bare, metal surface free of dirt, corrosion, road grit or paint. The ground will not work if it is connected to aluminum or plastic.

If you determine your tow vehicle is not the issue then it is time to move to the trailer.

Start with the same pin on your 7-way on your trailer.(It will be in the 11 oclock position from that side) Make sure it is not bent, damaged or corroded. On the back of the connector verify that your wire is properly and securely attached. Next it is time to visually inspect the wire going to your LED running lights for any nicks that could be stopping the flow of current.

Finally, check the ground that is being used on your running lights. Again, the ground needs to be attached to a bare metal surface that is clean and free of road grime, paint and corrosion.

I have attached a FAQ article that gives troubleshooting tips. I have also attached a brief video showing circuit testing a 4 way connector.

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