What Wiring do I Need for My Lights to Work on My 2023 Kia Soul While on Tow Dolly?

Updated 09/12/2025 | Published 08/23/2025

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(186)

$119.74

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord

(3516)

$183.41

Question:

I have a 2023 Kia soul w/halogen tail lights. I have a Roadmaster tow dolly RM2477 to tow my vehicles behind my motor home. I need to know, if install the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Part Number: C89KR and plug it into my motor home, will the lights work on the Kia? In other words, The Kia is receiving power from the motor home/dolly. Thank You

asked by: Stephen

Expert Reply:

Hello Stephen,

The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C89KR is not the correct wiring for what you’re trying to accomplish. The # C89KR is designed for your 2023 Kia Soul if you were towing a very light trailer or using a hitch-mounted accessory.

For your setup, you’ll need flat tow wiring so the lights function properly while on the tow dolly. I recommend the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267. Since the Kia Soul cannot be flat towed and must be used on a tow dolly, our system will list the wiring as “not confirmed to fit,” but it will work in your situation.

What kind of awesome adventures have you been on this year, or where are you headed next?

expert reply by: Kate F

Kate F.

9/12/2025

Hey Stephen, did the Roadmaster wiring kit work out for your Kia Soul on the tow dolly? I'm asking because your experience could help others with a similar setup.