All Trailer Taillight Functions Work Except Running Lights

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Question:

No running lights on trailer got power coming out of both trucks got everything but running lights even put a new connector on still nothing follow the line up to the junction box where it meets the wire going to lights and got power there as well it gets lost someplace in trailer Could it be a grounding issue?

asked by: Slade W

0

Expert Reply:

This could certainly be a grounding issue. When a circuit does not have a sufficient ground, it can cause many different issues. If possible, I recommend checking all of the grounds for your trailer taillights. You will want to make sure the ground has contact with a bare, clean, metal surface of the trailer frame. If there is any rust or corrosion at the light ground, try relocating the light grounds to a suitable location.

Another possibility is that the wire for the running light circuit has been damaged between the junction box and the taillight. If the wire has been pinched, torn, or damaged, then the running light circuit is likely not reaching the light. You can test the wires on the back of the taillights that carry the running light signal with a circuit tester, # PTW2993, to see if they have signal behind the light housing. If there is no signal on the wire here, then it is likely the wire is damaged somewhere along the trailer. Try tracing the wire as much as possible from the junction box to the taillights. If you are able to find the damage, replacing the damaged section of wire will complete your trailer's running light circuit again.

If this does not provide a solution for you, feel free to let me know and I will be happy to provide further troubleshooting steps for you.

expert reply by: Victoria B

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Answer 1

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 2

The 4-way on your trailer is what's known as a wishbone connector like part #A35W42B. Two of the wires are the running light circuit which is a little easier to install since you can run one down each side of the trailer. This way you…

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Answer 3

Trailer running lights not working with certain Nissan vehicles is a common problem with an easy fix. There is a relay for the trailer running light circuit that is located in the fuse box (in the cab). If that relay is missing or no longer functions…

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Answer 4

For your Blue Ox Aventa II Tow Bar BX7335 and your 2006 Saturn Vue, I recommend you start with the Blue Ox Base Plate Kit - Removable Arms #BX3335 and Loctite #LT37420. Then you can use Blue Ox Base-Plate and Receiver Lock Kit - Qty 4 #BX88177 to…

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Answer 5

That is exactly what converter #118158 was designed for. You will not have to use diodes, although you could if you wanted and it wouldn't hurt anything, because there is only one input circuit for each of the wires. The red output wire would go…

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Answer 6

The Tow Ready Vehicle To Vehicle Taillight Converter, #118158, you have referenced will not be needed since you will be staying with a 3-wire system (separate stop and tail lights)on both of your vehicles. The converter is only needed if you had a…

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Answer 7

If your 2022 Kia Telluride does not have any of the wiring for adding a tow package you will need the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness #C59496 to tie into the tail light wiring for a 4-way flat trailer connector.…

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Answer 8

The plug-in trailer wiring harnesses for a 2023 Kia Telluride that use the factory tow package port were all recalled due to a fire hazard potential, dealer and aftermarket. That said, we do still have an option for you but you must hardware into the…

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Answer 9

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. The next thing is to…

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Answer 10

It sounds like there is a short circuit that is overloading the running light circuit in the tow package wiring on your tow vehicle. The most likely culprit is a dirty or corroded trailer connector on the vehicle or trailer if not both. The first…

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Answer 11

Based on what you described it sounds like the running light circuit is somehow shorting out between the trailer connector and the light assemblies. A lot of trailer lighting issues are ground related, but since your brake lights are functioning the…

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Answer 12

The problem you are having is a classic ground issue. If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned the extra amperage draw for…

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All Trailer Taillight Functions Work Except Running Lights

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