Can Converter Box On Curt 4-Way Wiring Harness Go Bad

Question

Question:

Is it possible that the Curt 4 flat wire harness can go bad? I have taillights, both turns, and flashers, but no running lights. When I jump from the vehicle brake light plug, trailer running lights will work. Thanks

asked by: Shawn L

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Expert Reply:

It is possible that the Curt 4-way connector like the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C62VR can short out. This is usually caused by a short in the trailer wiring.

You can test your harness by using a circuit tester like # PTW2993 to check the running light wire going into the converter box, and the wire coming out of the converter box. If you have power going in, but not coming out the converter has shorted out and will need to be replaced.

The reason for this is to prevent a short from damaging any of your vehicles wiring, and before installing a new harness I recommend checking the running light wires on your trailer to confirm there is not a damaged wire that could be shorting out.

expert reply by: Samuel C

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Answer 1

The Curt T-Connector Vehicle Wiring Harness #C62VR will plug in line of the factory wiring harness on your 2021 Jeep Grand Cherokee. I have included a picture of the drivers side connections. The female connector from the Cherokee will plug into the…

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Answer 2

For setting up your 2021 Jeep Grand Cherokee (without factory tow package) for wiring, you will first need a 4-way harness. For a 4-way that is compatible with your vehicle, I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat…

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Answer 3

It sounds as though there is a short or something is mis-wired. Using a circuit tester, like the #PTW2993, check the connection points in the vehicle side connector, to see if there is constant power on the running light circuit (brown wire on the…

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Answer 4

I suspect your problem is caused by a damaged or corroded trailer connector. Take a look at your trailer connectors, both the socket on your truck as well as the plug on the trailer. Look for green or white corrosion on the pins or sockets of the…

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Answer 5

Converter boxes like what is on the Tow Ready Wiring Harness #118349 can short out. Actually if there's a short on the trailer wiring they tend to short out pretty frequently. If you tested the input side of the box and the voltage is there when…

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Answer 6

Johnathan, since there there is a signal with the lights off, then there is a problem on the vehicle side. What you're going to need to do is check to make sure that the brown wire is properly connected to the running light wire at the rear of…

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Answer 7

What I would do is try bypassing the tee connection on the Curt T-Connector #C56413. If you plug everything back up how it was before you installed this kit then you can test the 7-Way at the back of your 2018 Ford F-150 to see if everything is…

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Answer 8

Most likely your old harness shorted due to a short on the trailer wiring and that is why it got damaged and needed to be replaced. Since you replaced the wiring of your trailer you should be good now. Sorry to hear about the problems you had with…

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Answer 9

It sounds like you may have a loose wiring connection or a corrosion problem on the 7-way pin for the right turn/brake lights. This pin is the one at the 3-o-clock position as you're looking at the vehicle's 7-way; please refer to the linked…

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Answer 10

First, check the connections on the vehicle that plug into the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, #C55510. If one of the pins in the connector is bent or misaligned, then this could be the reason your…

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Answer 11

With having a Curt Upgraded Circuit Protected Powered Tail Light Converter #C59496 on your vehicle you will not be able to connect your vehicle and trailer wiring directly. The converter reduces draw on the factory wiring and send power to the…

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Answer 12

It is possible that during the installation of the fuses and relays that something got knocked loose or damaged. Check the fuse panels where those items were installed and see if anything is damaged or missing. Also, make sure the relays are in the…

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