To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
No need to cut or splice wires when adding trailer lights. This Curt T-Connector plugs directly into the vehicle’s existing tail light wiring to create a 4-flat trailer connector. The factory-style plugs make it simple and clean—just connect both sides, and you’re ready to tow.
The 4-flat connector gives you the standard lighting functions needed for towing—running, brake, and turn signals. It provides a solid, consistent link between the vehicle and trailer lights so everything works in sync when you hit the brakes or turn.
This harness uses the same tail light signal feed as the vehicle, so it works correctly even with setups like sequential taillights. Since there’s no converter box, there’s less to go wrong and nothing extra to mount or wire.
If your vehicle didn’t come with a tow package, this harness is an easy way to add one. It includes everything needed for a clean installation and hides neatly behind trim panels for a factory look once installed.
Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
Ratings & Reviews

Mike L.
4/21/2018
According to Curt, the # C55326 trailer wiring harness does not feature a separate ground wire that needs to connect to the vehicle chassis because the vehicles tail light wiring harness already grounds to the vehicle. An additional connection wasnt necessary.

Rachael H.
7/5/2018
I have confirmed with my contacts at Curt and this wiring harness is confirmed as a fit for your Grand Marquis. The connectors from this wiring harness are located in the rear of the trunk behind the taillights. You may need to remove some of the interior lining of the trunk to be able to get to the connectors. There is a helpful image on page 2 of the instructions provided by Curt.
Helpful Links

Steve J.
2/25/2017
perfect

Katrina B.
8/29/2022
I am sorry to hear that your wiring harness arrived damaged. I have sent your information over to our customer service department for them to get in touch with you.
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.









Nick S.
9/29/2025
That is great to hear! It looks great on your vehicle. What are you looking to use the hitch for??