Why Would Right Turn Signal Come on When Left Turn Signal is On for Trailer Wiring

Question

Question:

Ok, Ive did everything and the right turn signal still blinks when I turn on the left turn signal

asked by: Ricky J

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Expert Reply:

If your right turn signal is blinking with the left turn signal applied that most likely means you have a short between the right turn and left turn signal circuits or you possibly have the left turn signal shorted out to the running light circuit as well. If the second scenario was happening you'd likely see the right turn signal blinking at a dimmer intensity than the left. If both lights are same brightness then that would indicate you have a short between the left and right turn signals.

Shorts are created when exposed wire between the two circuits touch each other like if the wire is cut. Check for that and fix as needed. I attached a help article with more info on trailer wiring for you to check out as well.

expert reply by: Jameson C

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Answer 1

Sounds like you wired both your left and right turn signals to your right turn signal. To correct this you will need to rewire your trailer. Since trailer wire colors can vary (not usually) you will make sure you wire by function and not just color.…

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Answer 2

What you are describing is normally the result one 1 of 3 issues: First, there could be some corrosion in or on the connectors on the vehicle or trailer side or both. Second there could be a bad ground. Bad grounds can cause all sorts of bizarre…

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Answer 3

To confirm it is a controller module (circuit board) issue with harness #118675, I recommend double checking your connectors to make sure there isn't a bent pin and the connections are tight and then making sure the ground connection is bare…

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Answer 4

If both turn signals blinking at the same time is a new problem that has occurred after the harness had worked fine before, there are a couple of possibilities that may be causing the issue. First, the easiest thing to check are the trailer…

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Answer 5

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 6

The tail lights on the back of a trailer run off of the running light circuit so the fact that the other lights on that circuit are working and most of the problems are just at the rear tail lights that makes me think there is a ground problem.…

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Answer 7

First, I would not immediately dismiss a bad ground simply because there are so many of them in an electrical system that could be faulty. While there may be some fluctuation in the voltage when the turn signal is cycling on and off, it seems like…

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Answer 8

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 9

If a converter box is blown then it will need to be replaced because there are no user serviceable parts inside. To determine if a converter is bad you will want to test the wires going into the box and the wires coming out with a circuit tester like…

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Answer 10

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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Answer 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Why Would Right Turn Signal Come on When Left Turn Signal is On for Trailer Wiring

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