Troubleshooting Turn Signals After Installation of Curt 4-Pole Wiring Harness C56251 in Kia Sportage

Question

Question:

I installed a custom wiring harness part number 56251 on my 2012 kia Sportage. And the upper rear turn signals are not working. Please send me a wiring diagram thank you

asked by: Ivan N

1

Helpful Expert Reply:

Thank you for your wiring harness purchase.

The Curt 4-pole wiring harness kit # C56251 is a custom-fit product confirmed to fit your 2012 Kia Sportage. Since this installs using connectors that match those on the car there really is no wiring diagram per se, but the instructions are linked for you. Only the one power wire to the battery requires a spliced connection; this goes to the positive terminal via the included fuse holder.

You do not mention whether it is the vehicle or trailer turn signals that do not work. If the car's own turn lights do not work after you installed the harness then unplug it and inspect the metal contacts on both the harness and vehicle connectors. Something as simple as a bent pin (that does not make proper contact) could cause an issue on either the vehicle or trailer. Trapped foreign material or corrosion - even slight greenish discoloration - can indicate a corrosion issue that could interfere with a signal transmission. Try re-connecting the taillight wiring without the Curt harness.

If it is the trailer lights that do not work inspect the two 4-pole connectors, vehicle and trailer, for signs or corrosion. You can also check the trailer turn lights for a loose ground wire or bad bulbs. It is easy to test the trailer on its own by using the vehicle battery or a spare directly connected to the 4-pole trailer connector. If the lights on the trailer work when it receives power direct from a battery then you know the issue is on the vehicle side.

Please tell me more about the issue and I will be glad to assist further. You can also refer to the linked articles on troubleshooting trailer wiring.

expert reply by: Adam R

1

Answer 1

In order to narrow this down I would start by checking the vehicle side of the connector. Check and see if there is power using a circuit tester like the #PTW2993. If you find that there is power then you can rule out anything on the vehicle side and…

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Answer 2

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Answer 3

What you will want to do is test the wires going into the box of the Curt Wiring Harness part #C56496 for voltage with a circuit tester like the #PTW2993 to see if there is voltage going into the box when the taillight functions of your vehicle are…

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Answer 4

Thank you for your February 2016 purchase of the Curt 4-pole wiring harness #C56222, which is a confirmed fit on the 2013 Kia Soul without LED-type lighting. This unit is indeed a plug-n-play harness that can only install one way, by plugging in at…

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Answer 5

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Answer 6

The first thing I would check is to ensure you have the pigtails attached to the taillights on the correct side of the vehicle, the driver's side pigtail from the harness will have a yellow wiring running in between the other wires whereas, the…

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Answer 7

The Tekonsha T-One Wiring Harness #118451 that you ended up installing is the correct harness for your 2012 GMC Acadia and it will work whether or not you have the tow package so you made the right choice there. If you happen to have your trailer on…

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Answer 8

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Answer 9

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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Answer 10

When it comes to choosing between the Blue Ox Patriot #BLU37TR and the Brake Buddy Select 3 #HM39524, these systems are extremely similar in their setup and functionality. Both of these systems provide proportional braking in a compact and easy to…

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Answer 11

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Answer 12

Yep, so long as your 2024 Subaru Crosstrek Wilderness is not a hybrid both the Curt and etrailer hitches will fit: - Curt Trailer Hitch Receiver #C13382 - etrailer Trailer Hitch Receiver #e98912 The only difference besides price is the finish; the…

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Troubleshooting Turn Signals After Installation of Curt 4-Pole Wiring Harness C56251 in Kia Sportage

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