Troubleshooting Running Light Circuit of Trailer Wiring Not Working Afater Install

Question

Question:

I installed following instructions. Stop and Turn signals work fine but no Tail lights on trailer. Car lights work fine. I checked the 4 pole connector on the car. No tail lights there. Please help - Thank you

asked by: Didier C

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Expert Reply:

Sometimes the issue you are having is simply just the connectors not fitting tight enough for the connection to be made. Unplugging and reconnecting the setup sometimes fixes this. After you try that use a circuit tester to test the brown wire coming from the connector on the left side when the running lights are on. If there's voltage there but nothing after the converter box the box is bad. If there is no voltage there then the issue is the connectors still aren't connecting with the running light circuit of the vehicle.

I attached a couple help articles on trailer wiring troubleshooting for you to check out as well.

expert reply by: Jameson C

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Answer 1

There's a slight possibility that the ground could be causing the problem, but it's morel likely that the T-Connection of the #C56331 on the driver's side isn't fully connected. You'll need to make sure that connection is fully…

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Answer 2

The issue you described is likely attributed to the t-one connectors installed on the wrong side of the vehicle. The connector with the green and white wire goes on the passenger side and the connector with the brown and yellow wire goes on the…

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Answer 3

It sounds like there could be a ground issue and also a short somewhere along the trailer that is causing the lights to turn on when the ignition is off. A bad or weak ground can lead to a variety of strange issues. I first recommend checking that…

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Answer 4

The most likely cause for the turn signals not to work when the running lights are on with your trailer is a bad or weak ground. It's very possible that a weak ground connection can be just strong enough to allow sufficient current for some…

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Answer 5

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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Answer 6

The first thing you will need to do is make sure all of the connections are being firmly made from the Curt T-Connector Vehicle Wiring Harness #C56331 to your 2011 Chrysler Town and Country. If every connector is making a good connection, you will…

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Answer 7

The converter you have is bad. If the signal going into the converter is good, but coming out of it is bad then the problem is a shorted out converter and it would need to be replaced. Before you replace it you will want to inspect the wiring of your…

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Answer 8

First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part #PTW2992 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage…

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Answer 9

If your trailer lights are working correctly with another vehicle then the wiring kit you got might need to be replaced. Reason being if the vehicle lights on your 2013 Dodge Grand Caravan are working just fine then that means the tee connectors on…

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Answer 10

The first thing I would recommend is checking the owner's manual of your 2014 Honda Ridgeline Sport to see what it says about using a weight distribution hitch. In general, a WDH is recommended if your trailer weight is more than 50% of your…

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Answer 11

This sounds like either a ground problem or a loose or broken wire causing your problem. First, you will need to check for a proper ground at the connector and at each light. The taillights are grounded through the mounting bolts. I have included a…

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Answer 12

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Troubleshooting Running Light Circuit of Trailer Wiring Not Working Afater Install

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