Recommended Trailer Wiring Harness For A 2025 Hyundai Tucson SEL
Question:
My new 2025 Hyundai Tucson SEL does not come with the factory harness like the 2022-2024 models did. I dont want to splice into wires, so was looking at the Tekonsha ZCI but I see a previous Q indicated that it wont work properly with LED tail lights. 1 What options do you have and 2 regardless of product, where do you connect to the vehicle wires?
asked by: Tim D
Expert Reply:
Hey Tim,
The ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT is compatible with LED lights and has been used as a go to for years for people who have LED trailer lights. The light function is supposed send a tiny bit of voltage from the vehicle tail lights to the converter box so it knows what signal to send out the 4-pole connector to the trailer. If your tail lights are staying on like that question you saw then the shop either spliced the wrong wires together or the converter box was bad because power shouldn't be flowing backwards.
That being said, you'd be paying more than double for just some quick splices added onto the wires so I recommend switching to the Curt Powered Tail Light Converter # C59236 instead. This kit comes with quick splices # SWC502905-1 but I typically just use a butt connector # DW05714 to ensure a secure connection that won't be able to vibrate loose while on the road. Without the factory tow package this universal harness is really the only option and it would need to be wired in the following manner:
White - ground to frame using included ring terminal and self-tapping screw
Black - run to battery using included wire, this will require routing the wire under the vehicle while avoiding any parts that move or generate heat. When you get to the battery you'll need to splice the included fuse holder to help protect your wiring.
For the rest of the wires I've attached a chart below showing where they need to go depending on the what style of wiring your Tucson has. Your Tucson should have 3-wire but it wouldn't hurt to check if you could potentially have PWM wiring, in which case the only difference is that you'd ground the brown running light wire.
If you have any more questions just let me know and I'd be happy to help.
(click to enlarge)
Products Referenced in This Question
Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Powered Converter
- Universal Fit
- 4 Flat
- Plug and Lead
- Splice-In
- CURT
more information >
Butt Connector - PVC - for 16-14g Wire - Qty. 1
- Wiring
- Wire Connectors
- Butt Connectors
- 16-14 Gauge
- Deka
more information >
Quick Splices - Self-Stripping Connector - Closed Port - 14-16-18 Gauge - Blue - Qty 1
- Wiring
- Wire Connectors
- Quick Splice Connectors
- 18-16-14 Gauge
- Spectro
more information >
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Powered Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Hidden
- CURT
more information >
Featured Help Information
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Tim D.
10/25/2024
Thanks for the info Kevin. Where do I connect the harness? There is a connector behind the driver's-side rear wheel, like the older models and the wires are wrapped in plastic spiral wrap. I'm assuming I'd have to strip that back a bit to tap into the wires. However, I've found in our OH winter-salted roads that exposed connections corrode pretty quickly. I've also seen other harness products directing the user to fish wire up through the tail lights. Additionally, I have the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Part Number: CU94FR from my 2022 Tucson, and am wondering, since I have to splice anyway, if I can just cut the plug off and splice it in. Thanks