Left Turn Signal On 7-Way Trailer Connector is Not Working

Question

Question:

My left side wire for trailer on truck has no power. Chased. Itfytther back lookd like ot runs further in to truck. How can i figure this out?

asked by: Ilario F

0

Expert Reply:

It is possible that there is a blown fuse or relay related to the tow package wiring that is causing the problem. Use the vehicle owner's manual to find the locations.

It is also possible that there is a break in the wire somewhere. You will need to use a circuit tester like # PTW2993 if needed to test the wire as you work your way forward on the truck.

If the right side stop light also does not work, it could be a blown stop light or CHMSL fuse. If the turn signal function works on that same circuit (a 7-Way has combined brake and turn signals at the 3:00 and 9:00 positions) then it could be a dirty or corroded trailer connector.

expert reply by: Michael H

0

Matthew P.

10/31/2021

The connector looks good and clean, should I replace the wiring harness then?

Reply

Les D.

11/1/2021

@MatthewP Please tell me more about your vehicle and trailer, and the issue you are experiencing and I will try to come up with a solution.

Reply

Matthew P.

11/1/2021

@LesD 2019 Yukon SLT, left trailer break light will not work. Already changed out the fuses. Connector looks clean. Waiting for more tools to arrive to test further. Shop said that they tested the trailer on their vehicle and the lights worked.

Reply

Les D.

11/2/2021

First is it possible that you have a bad bulb in that fixture? Assuming that you have neither brake light or running light. Ok, let's take this step by step. With the trailer disconnected from the Yukon, do the lights and blinkers on the Yukon work? If so, with the trailer disconnected, check the pins on the connector on the bumper of the Yukon. It would be easiest to test with the Draw-Tite # 40376 tester. Do all the blinkers work correctly? If not check the connections on the back of the 7-way connector on your Yukon bumper. Also check your connections inside the connector for rust, corrosion, and dirt. If bad, replace. Also check the white wire that comes out of the back of the Yukon 7-way connector. Verify that it connects to a grounded Yukon frame part and that the ring on the end of the wire is clean and bright, and that the place where it connects to the frame is clean and bright. Use a wire brush if not. Yes, it would be ideal to, do what the shop did, and hitch up something else to the Yukon. This will prove that the problem is, or is not, with the Yukon. If Yukon seems to be working correctly, check the connector from your trailer to see that all is clean and corrosion free. No on the back of the trailer connector pay special attention to the yellow wire for the left brake light. If you have power there, then trace the wire checking for any nicks, cuts, crimps or abrasions. Finally check the light fixture for damage. Check the ground on the back of the light. I have attached an article that discusses trailer wiring. Yes, it would be ideal to do what the shop did and hitch up something else to the Yukon. This will prove that the problem is, or is not, with the Yukon. If Yukon seems to be working corrrectly, check the connector

Helpful Links

faq-wiring.aspx

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Answer 1

Hello David, Congrats on the new Lance in bed camper! For your 2020 Ford F-350 Super Duty with 8 foot bed and factory installed hitch you are going to want the TorkLift Tie Downs - Custom Frame Mount - Front and Rear #TL54VV. For the turn buckles for…

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Answer 2

According to an owners manual I found from Ford for the 2006 F-150 the 12 power fuse for the 7-Way is located in spot 106 and requires a 30 amp cartridge fuse. There is also a Full ISO relay needed in spot R05. Your owners manual has a section on…

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Answer 3

Your brake lights and turn signals for each side are on one circuit. The left side turn signal and brake light is generally the yellow wire going into your trailer connector. The first thing to do is check the fuses on your tow vehicle. Next, inspect…

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Answer 4

It could just be a tow package fuse blown on your truck. There is one for trailer left turn signal and brake light in the fuse box in the cab between the dash and driver's side door. It is labeled LT TRLR ST/TRN. You would not be able to tap into…

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Answer 5

Since your trailer has the bracket #FRCBRKT-BL that would mean your trailer has the Furrion pre-wiring which is very common for newer RVs. The part #FOS43TASF is a fit for this and would be a really easy install. This gives you a monitor with a 4.3…

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Answer 6

The problem is that on your 2007 Chevy Tahoe, the turn signals on the vehicle are on a separate circuit than the brake lights. Trailers use a combined stop and turn circuit. When trailer wiring is added to a vehicle, vehicles with separate turn and…

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Answer 7

The best brake controller for your Yukon XL is going to be the Redarc Tow-Pro Liberty Brake Controller item #RED24FR. This is a proportional brake controller that activates your trailer's brakes when your Yukon decelerates. The reason the Tow-Pro…

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Answer 8

On the 7-way wiring plug and lead part #H20046 there isn't a purple wire. Normally a purple wire for a 7-way is for a reverse light circuit. Which would correspond to the yellow wire of this adapter.

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Answer 9

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 10

To check the pins on the vehicle side 7-Way, you can use a circuit tester or the volt meter. The circuit tester will show you if a signal is coming through on the pin you are testing while the volt meter will tell you that and how much voltage is…

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Answer 11

If you have a 7-Way on both your trailer and tow vehicle you will first want to make sure that you have a brake controller, like the Tekonsha Prodigy P3 #90195. A brake controller is what is used to send power from the tow vehicle and tells the…

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Answer 12

If your Furrion Vision S Wireless RV Backup Camera System w/ Night Vision, #FOS43TASF, has an unclear image displayed, it may be from a weak signal. The manufacturer recommends unpairing the cameras and then pairing them again in order to try and…

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Left Turn Signal On 7-Way Trailer Connector is Not Working

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