Troubleshooting Trailer Turn/Brake Signal Not Working on a 2014 Toyota Tundra

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Question:

Hey guys, I have a 2014 Toyota Tundra with factory tow package, just the other day when I hooked up to my trailer my turn signal/ brake lights didn’t work on the trailer, but they work on the truck. I still have running lights and my electric brakes work on both my enclosed trailer and dump trailer through the 7 pin plug. I also tried my small utility trailer through the 4 pin plug and had the same problems. I have checked every fuse in the truck both in the engine bay and under the dash and all fuses are in working order. I also tried switching relays out to the trailer relay and that didn’t work either. I put a volt meter onto the 7 pin truck side connector and I have 12v running to my running lights, brakes, aux power. For some reason I only have 10.5v running to both the left stop/turn and right stop/turn pins and I cannot figure out why. I have also hooked all three trailers up to a friends truck and all lights work properly. Any help would be greatly appreciated. Thanks

asked by: Luke D

0

Expert Reply:

Thank you for all of the details, you have already done quite a bit of the work in narrowing down the problem. Since the common denominator in this situation is your 2014 Toyota Tundra the issue can be isolated to that.

You should be getting 12V of power to your stop/turn lights so since that is lower you most likely have a ground issue. Check the ground on your Tundra as well as the wiring for those light circuits. You should find a bad ground or some wiring that has been pinched or damaged.

If you make sure that your ground is securely connected to a clean, bare-metal surface and replace any damaged wiring with 16 gauge wire like part # 16-1-1 and butt connectors # DW05744-5 than your problem should go away.

expert reply by: Jon G

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Answer 1

The converter box for the Curt T-Connector Vehicle Wiring Harness part #C55378 is not available as a separate replacement part unfortunately. However, I actually recommend you take a look at the T-One Vehicle Wiring Harness part #118378 instead…

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Answer 2

Since the brake light and turn signal functions are working on the truck side trailer connector, that indicates a problem on the trailer side. The first thing you are going to want to check is the trailer side connector. Make sure that it is clean…

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Answer 3

Thank you for the DOT number from your horse trailer's brake light lens. This is not the light's actual part number; that is usually found on the light base. If you can find that reference you can search our site using that number or use the…

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Answer 4

It sounds like the problem is either on the connector or on your VW. First, you will need to have someone help you test your connector. Using a circuit tester like part #PTW2993, you will want to test each pin on the vehicle connector for function to…

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Answer 5

The overall diameter of a 5.70-8 is right at 18.1 inches and the nearest size for a 10 inch rim is the 20.5x8-10 which is 20.5 inches in overall diameter. The width difference between the two is right at 2.5 inches. If you have room for the…

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Answer 6

First, when lights work intermittently that is an indication of a ground problem. It could also be a loose connection somewhere or a dirty/corroded trailer connector. Ground problems normally show up when there is more draw on a system such as when…

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Answer 7

It looks like the connector you need is actually already plugged into something which I have pointed out in the picture you sent. The empty plugs on the right side do not seem to match the connector on the Curt wiring harness #C55367 for the 2000…

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Answer 8

The Curt T-Connector Vehicle Wiring Harness, part #C55367 is designed to fit the 2000 Toyota Tundra. The connector the harness attaches to is located behind the rear bumper. I have attached a photo that shows where the vehicle plug is located. In the…

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Answer 9

I spoke with my contact at Curt regarding the correct wiring harness for your 2001 Toyota Tundra. He states that it is very likely that while your truck is labeled as a 2001 model, it was actually built in late 2000 with the 2000 model factory plug…

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Answer 10

Use your tester to test the brown wire going into the converter for wiring harness #C55367. If there is no power going into the box then there is an issue on the vehicle wiring. There could be a blown fuse for the trailer running lights. Use the…

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Answer 11

The small grey connector that is attached to the red fuse holder wire on the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part #C55367 for a 2000 Toyota Tundra is located in the vehicle's engine compartment between…

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Answer 12

The purple wire on the adapter included with the Brake Controller 7 & 4 Way Installation Kit, #ETBC7, is an auxiliary wire and can be used as a 12 volt power source, to power a reverse light or reverse lockout function for trailer brakes if…

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Troubleshooting Trailer Turn/Brake Signal Not Working on a 2014 Toyota Tundra

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