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2015 Freightliner Sprinter
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Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Part Number: C56340
In Stock
$35.92
Retail:$58.99
You Save: 39%
2015 Freightliner Sprinter
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- All Info
- Reviews (13)
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CURT Custom Fit Vehicle Wiring - C56340
Highlights
- Custom Fit for Your Vehicle: Works with your vehicle's wiring
- Tow Without Factory Prep: 4-way flat connector powers trailer lights for safe towing.
- Plug-and-Play Install: T-connector plugs inline with existing tail light wiring—no splicing.
- Clean Hidden Setup: Harness stays tucked out of sight for a factory-style finish.
- No Extra Modules Needed: Direct wiring design works without a separate converter box.
- Quick DIY Ready: Custom-fit harness installs fast for weekend towing projects.
Features to know about
Installs Clean Without Cutting Wires: Plug-In T-Connector
This harness skips the messy part of trailer wiring. It plugs directly into the factory connectors behind the tail lights, so you don’t have to cut, splice, or guess at wire functions. It’s built as a custom fit and gives you a clean install that blends right in with existing wiring.
Gives You the Basics for Towing: 4-Pole Flat Trailer Connector
Once it’s plugged in, the 4-flat connector provides running lights, turn signals, and brake lights to your trailer. It’s the standard setup for most small trailers and utility haulers, giving you everything needed for basic towing.
Built for a Seamless Connection: No Converter or Extra Box
There’s no separate power module or converter to mount with this harness. Curt tested it and found no circuit protection was needed for proper function. That means fewer parts to deal with and a simpler install that keeps things tidy behind the panels.
Ready to Tow Right Away: Factory-Style Fit and Finish
Because it uses vehicle-specific plugs, the harness snaps right in where it should. The fit feels factory, and you can route it through existing openings or grommets for a clean look. Once connected, it’s ready for the trailer—no extra adapters or hardwiring required.
Specs
Electrical and Connector Specifications
- Connector type: 4-Pole Flat Trailer Connector
- Circuit protection: None (no converter)
- Harness type: Custom plug-in T-Connector
- Connection style: Plug and lead
- Application: Vehicle end connector
- Tow package required: No
- Installation: Plug-in at vehicle taillights
56340 Curt T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector
Similar to Hopkins HM11141385
This Product Fits The Following Vehicles
- 2005 - 2009 Buick LaCrosse
- 2005 - 2009 Buick LaCrosse
Customer Satisfaction Score:
90% were satisfied with this product
10% of customers were not satisfied
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.8
13 reviews
by:
Tom M
08/03/2017
2007
Buick
LaCrosse
This is the second one I have purchased from you. The first was excellent, easy to install and I'm sure this one will be also. To make it even easier I ordered the wiring harness also. I will have to tell you later how it went since I just received it. I was surprised how fast it came. Thanks
by:
Mike R
03/13/2017
2006
Buick
LaCrosse
Instructions weren't quite accurate - there was more disassembly required to get to the tail light connectors than the instructions indicated. Also, there is a ground wire that the instructions did not indicate where/how to attach. Kit was complete, and was easy to install (installation made sense - just pointing out that the instructions could be more accurate). For the record I installed this on a 2006 Buick Lacrosse CX.
by:
Stanley
09/23/2020
I received the trailer hitch & wiring kit for my 2008 Buick LaCrosse in a very timely manner. The installed very easily, quite like the video showed. I installed the wiring kit today, & it fit perfectly and works as it should. Thank you.
by:
Dennis
11/12/2017
No splicing of wires, just remove taillights and plug in and ready to go
by:
Jerry R
05/30/2017
Hitch and wiring were in stock, unlike a competitor who's products were on backorder. Shipped in a timely fashion!
by:
Richard
07/16/2021
Just what I needed to complete the hitch installation. Thank you
by:
Rick
09/02/2020
2006
Buick
LaCrosse
Excellent item, priced right and delivered quickly.. and great communication. This kit was fully assembled was very easy to install - and fit the 2006 Buick Lacrosse perfectly.
by:
Jim
11/09/2022
Jim
11/10/2023
Working great
by:
Jonathan
04/26/2021
easy peasy
by:
Rodney
04/23/2026
by:
Robert
07/31/2022
by:
Richard
09/13/2022
by:
David
07/18/2023
13
13
true
See what our Experts say about this CURT Custom Fit Vehicle Wiring
- Trailer Hitch Recommendation for 2006 Buick LacrosseFor your 2006 Buick LaCrosse we have the Draw Tite hitch part # 36374 which is a confirmed fit and will work well for you. It has a 3,500 lb trailer towing capacity but you'll also need to check the owners manual of your vehicle for it's towing capacity and be sure not to exceed the lower of the two figures. For trailer wiring you'd then want the # C56340 which is also a confirmed fit. For a ball mount you'd want the # 36061 and then for hitch balls # 19258 for a 2 inch ball and part #...
view full answer... - Recommended Parts to Tow a Small Trailer with a 2009 Buick LaCrosseWe have everything that you need to get towing with your 2009 Buick LaCrosse. For a trailer hitch I recommend the 1-1/4" Class II Curt # C12239 because we have found the Curt trailer hitches typically have better welds and a thicker powder coat than other options. This contributes to a longer lifespan of the trailer hitch which in turn raises the quality of the hitch. Since you're needing to tow a smaller trailer you'll also need wiring to activate the trailer lights and for that I recommend...
view full answer... - Recommended Trailer Hitch for 2007 Buick LaCrosseYes, the Draw-Tite Trailer Hitch, # 36374 is a confirmed fit for all models of the 2007 Buick LaCrosse. This is a Class II trailer hitch with a gross trailer weight capacity of 3,500 pounds, and a tongue weight capacity of 350 pounds. I have included a link to the installation details and a video showing a typical installation for you to view. If you plan to do some towing the recommended ball mount is # 36061. For a ball, use # 19256 (1-7/8 inch diameter) or # 19258 (2 inch diameter)....
view full answer... - Trailer Wiring Harness Recommendation for a 2006 Buick LaCrosseThe Curt wiring harness part # C56340 is the correct wiring harness for your 2006 Buick LaCrosse. However, it does not have any circuit protection built into it. This is a custom harness designed to install easily on your vehicle, but it does not have circuit protection. Curt tested your vehicle and determined that circuit protections wasn't necessary. If you wanted a harness with circuit protection you would want the Tow Ready Custom Fit Vehicle Wiring # 119178KIT. This is a hardwire...
view full answer... - Trailer Wiring Harness for 2005 Buick AllureI spoke with my contact at Curt, who tells me that the reason that the # C56340 isn't shown as being a fit for the 2005 Buick Allure is that the wiring harness was never tested on the vehicle. Because of this, Curt won't call it a fit. If the only difference between the two vehicles is the nameplate, then the harness should fit. However, because Curt can't confirm the fit, we can't guarantee you the harness will work. If you feel like taking a gamble, go with the # C56340 but if you want...
view full answer... - Will Installing a Transmission Cooler On A 2006 Buick LaCrosse Increase Towing CapacityThe addition of a transmission cooler will absolutely help while towing with your 2006 Buick LaCrosse to both increase performance and prolong the life of your vehicle's transmission. That said, it will not increase your towing capacity in the eyes of the manufacturer. However, the factory warranty on your LaCrosse has most likely already expired so I recommend you just use your best judgement when it comes to your towing capacity after adding supplements such as a transmission cooler....
view full answer...
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
Edited by:
Lindsey S
Installed by:
Cole B
Updated by:
Wilson B
Updated by:
Kristina F
Updated by:
Isabelle B
Written by:
Amanda M
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Tom M.
8/4/2018
Instructions were good but wiring was not easy to install. Took a lot more time than I would have ever thought. After installation everything has been working fine