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Complete CURT Class 2 1-1/4" trailer hitch and 4-flat custom wiring kit engineered for the 1978 - 1987 Buick Regal RWD, excluding wagon. Vehicle-specific fit, plug-and-play installation, all hardware and instructions included.
This custom kit fits the following vehicles:
All Hardware and Installation Instructions Included!
Whatever the next checkpoint is on your adventure -- whether it's getting your bike on the trail before sunrise or making it to the campground before dark -- CURT class 2 hitches let you Bring It with confidence. These receiver hitches are made to handle most light-duty towing applications and offer a custom fit for your vehicle. Typically used on full-size cars, crossovers, compact SUVs, minivans or even compact pickup trucks, a CURT class 2 trailer hitch complements the design of smaller vehicles. This particular class 2 hitch is made to be a custom hitch for certain years of the Buick Century or Regal, Chevy El Camino or Monte Carlo, Oldsmobile Cutlass Ciera or Cutlass Supreme and Pontiac Bonneville, Grand Prix or LeMans (to verify vehicle compatibility, see application info). It offers a weight carrying capacity of 3,500 lbs. GTW and 350 lbs. TW. Class 2 trailer hitches can typically be used to tow a variety of lightweight trailers, such as a small utility trailer, small fishing boat trailer or popup camper (NOTE: Never exceed the lowest weight capacity of any towing component). They are also perfect for adding cargo space to your vehicle with a bike rack or cargo carrier. This class 2 hitch features a 1-1/4" receiver tube to accept a ball mount shank or other hitch-mounted accessory. For safety, it is tested in accordance with SAE J684. A custom trailer hitch design requires extra care, and as such, CURT class 2 hitches are engineered using real vehicles and hands-on research. We use high-strength steel, robotic welding and rigorous testing to produce hitches that are built to fit your lifestyle. To ensure that each hitch will be a reliable extension of your vehicle, we also finish our hitches in a co-curing of liquid A-coat and black powder coat, giving them long-lasting rust and wear resistance.
If your vehicle is not equipped with wiring for towing a trailer, CURT custom wiring is the ideal solution. A custom wiring harness -- also called a T-connector -- is a simple, plug-and-play electrical device that plugs into your automotive electric system and provides a standard, universal trailer wiring connection. This is done using two or more vehicle-specific, OEM-compatible connectors to plug into the taillight assembly, eliminating the need for cutting, splicing and soldering during installation. Custom wiring harnesses are made vehicle-specific, and while they are not available for all vehicles, they do offer one of the fastest, easiest and most secure ways to wire a vehicle for towing. This particular plug-in harness provides a 4-way flat connector socket and is designed to be a custom wiring harness to fit certain years of the Nissan Sentra (to verify your vehicle compatibility, see application info). It comes with all necessary wiring components to establish a reliable trailer wiring connection, as well as a dust cover to keep the connector clean when not in use. You have a picture in mind of your next destination -- maybe it's the boat landing at your favorite fishing spot, maybe it's a campsite that overlooks one of nature's masterpieces, or maybe it's the next big jobsite. However, turning that picture into a reality takes more than just daydreaming. It takes a solid connection and the right amount of power. CURT custom wiring is made with some of the most sophisticated technology in the industry and is designed to install with ease, giving you a long-lasting electrical connection for your towing hitch setup.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
Experts available to answer your questions
Call 888-634-9494One-Year Limited
1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 1978 - 1987 | Buick Regal | RWD, excluding wagon |
The 78 - 87 Buick Regal RWD, excluding wagon Curt 1-1/4", Class 2 Trailer Tow Hitch + 4-flat Wiring Kit 12005 (Part #CHW-216) fits 1978-1987 Buick Regal models. The 1987 model year is the last year covered by this part number. For newer models, check for an updated version.
The 78 - 87 Buick Regal RWD, excluding wagon Curt 1-1/4", Class 2 Trailer Tow Hitch + 4-flat Wiring Kit 12005 (Part #CHW-216) fits the following vehicles: 1978-1987 Buick Regal. Always verify your specific year, make, and model before ordering.
Yes, the 78 - 87 Buick Regal RWD, excluding wagon Curt 1-1/4", Class 2 Trailer Tow Hitch + 4-flat Wiring Kit 12005 (Part #CHW-216) is designed to fit the 1978-1987 Buick Regal.
The 78 - 87 Buick Regal RWD, excluding wagon Curt 1-1/4", Class 2 Trailer Tow Hitch + 4-flat Wiring Kit 12005 (Part #CHW-216) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Yes, the Curt 12005 is designed for 77-88 Chevrolet Monte Carlo models, which includes your 1985 model.
Yes, the Curt 12005 is compatible with 78-81 Century Sedan and Wagon models, which includes your 1980 Sedan.
Yes, the Curt 12005 is designed for 78-87 Pontiac Grand Prix models.
Yes, the Curt 12005 is compatible with 78-88 Oldsmobile Cutlass Supreme models.
Yes, the Curt 12005 is designed for 78-88 Chevrolet El Camino models. Note that on El Camino models, the bumper must be removed with the E/A assembly to access the rear frame opening for fishwiring the bolts.
The Curt 12005 is designed for use with ball mount D-20 / 45520.
The manual specifies a gross load capacity of 3,500 lbs. trailer weight and 350 lbs. tongue weight when used as a weight-carrying hitch. However, you must not exceed your vehicle manufacturer's recommended towing capacity.
The kit includes: 2× 1/2-13 UNC carriage bolts (2-1/4"), 2× 1/2" flat washers, 2× 1/2" lock washers, 3× 3/8-16 UNC hex cap screws (1-1/4"), 6× 3/8" flat washers, 2× 0.250 × 1.50 × 2.00" square hole spacers, 2× 1/2-13 UNC hex nuts, 3× 3/8-16 UNC nylon lock nuts, and 1× 1/2" fishwire.
You will need a 3/8" drill bit to enlarge the E/A bolt holes. A torque wrench is required to properly tighten the fasteners to specification (1/2" fasteners to 110 lb.-ft. and 3/8" fasteners to 45 lb.-ft.). Standard wrenches or sockets will be needed to install and tighten the bolts and nuts.
On most vehicles, the bumper does not need to be removed. However, on El Camino and Caballero models, the bumper must be removed along with the E/A assembly to allow the carriage bolts to be fishwired from the rear frame opening.
Yes. Step 2 of the installation requires you to enlarge the E/A bolt holes using a 3/8" drill bit. This is a permanent modification to the vehicle's existing attachment points.
The 1/2" carriage bolts and hex nuts must be torqued to 110 lb.-ft.
The 3/8" hex cap screws and nylon lock nuts must be torqued to 45 lb.-ft.
Non-trailer loads can be carried, but they must be supported by Curt 18050 stabilizing straps. Failure to properly support non-trailer loads will void the product warranty.
While the Curt 12005 has a gross load capacity of 3,500 lbs. trailer weight and 350 lbs. tongue weight, you must not exceed your vehicle manufacturer's recommended towing capacity. Always follow your vehicle's specifications.
Periodically check the receiver hitch to ensure that all fasteners are tight and that all structural components are sound. The manual does not specify a particular interval, so regular visual inspection before each use is recommended.
The Curt 12005 fits 78-87 Buick Regal RWD, 78-81 Century Sedan and Wagon, 77-88 Chevrolet Monte Carlo, 78-88 El Camino, 78-83 Olds Cutlass Ciera Cruiser, 78-88 Cutlass Supreme, 82-86 Pontiac Bonneville, 78-87 Grand Prix, and 78-81 Montana.
Torque 1/2" fasteners to 110 lb.-ft. and 3/8" fasteners to 45 lb.-ft.
The Curt 12005 has a gross load capacity of 3,500 lbs. trailer weight and 350 lbs. tongue weight, but you must not exceed your vehicle manufacturer's recommended towing capacity.
Yes, all non-trailer loads must be supported by Curt 18050 stabilizing straps, or the warranty will be voided.
The Curt 56500 is a powered converter system that allows you to connect a trailer to a passenger car by tapping into the vehicle's existing taillight wiring. It converts the vehicle's taillight signals to a 4-flat trailer connector, enabling the trailer lights to function when connected. The system includes a converter box, custom wiring harness with yellow and green wires, power lead, ground wire, fuse holder, cable ties, double-sided tape, and a 4-flat dust cover.
The Curt 56500 is designed for 12-volt negative ground systems only. Do not use this converter on any other electrical system configuration. Check your vehicle owner's manual or contact the vehicle manufacturer to confirm your vehicle has a 12-volt negative ground system before purchasing.
The Curt 56500 is designed for passenger cars with factory taillight connectors that can be accessed from inside the trunk. The installation requires access to wiring locations P3 and P4 (behind driver and passenger side taillight housings, inside the trunk). Compatibility may vary depending on your specific vehicle model and year. Consult the manufacturer or a fitment database to confirm compatibility with your vehicle before purchasing.
You will need: ratchet, wire cutter, 10mm socket, crimp tool, panel trim removal tool, and wire stripper. These tools are required to remove trunk trim, disconnect and reconnect battery terminals, separate taillight connectors, and prepare wiring connections. Proper tools will improve installation quality and reduce installation time.
The Curt 56500 includes: custom wiring harness with yellow and green wires, black converter box, black power wire with ring terminal for battery connection, white ground wire with ring terminal, ground screw, fuse holder with 10-amp fuse, cable ties, double-sided tape for converter mounting, and a 4-flat dust cover. All fasteners and connectors needed for installation are provided.
Yes, you must disconnect the negative battery terminal before beginning installation. Fasten this wire down and away from the battery while completing the installation process. Reconnect the negative battery terminal only after all other installation steps are complete and the fuse has been installed.
You must remove the floor board to expose the spare tire, then loosen and remove the threshold straight up. Pull the trunk liner toward the inside of the trunk on both sides to expose the taillight wiring. Use a panel trim removal tool to remove three push fasteners on each side of the trunk liner and two push fasteners in the threshold.
Starting on the driver side, locate the taillight housing and separate the connectors, taking care not to damage the locking tabs. Locate the harness with the yellow wire and insert the custom wiring harness between the separated connectors. Make sure the connectors are fully inserted with locking tabs in place. Repeat this process on the passenger side with the green wire harness.
Locate a flat spot on the driver side behind the felt liner and adhere the black converter box using the provided double-sided tape. The converter box should be positioned securely and out of the way to avoid interference with vehicle components.
Route the 12 GA black power wire from the vehicle battery to the converter, taking care to avoid any pinch points and hot or rotating components. Secure the power wire to the vehicle chassis using the provided cable ties. When passing the power wire through sheet metal, use an existing grommet, add a grommet, or use silicone to protect the wire from sharp edges. Connect the ring terminal to the positive (+) battery terminal. Install the fuse holder with a 10-amp fuse after all other steps are complete.
Locate a grounding point such as an existing screw or bolt in the frame of the vehicle. If no suitable point exists, drill a 3/32" pilot hole. The area should be free from rust, dirt, and paint—use an abrasive pad or paper to remove rust and paint. Secure the white ground wire with the ring terminal on the existing fastener or with the provided ground screw. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
When in use, route the 4-flat with the center of the vehicle and out of the hatch to the trailer, being sure to stay clear of the hatch's latching mechanism. When not in use, roll up and store in a convenient, out-of-the-way location. Secure any loose wires with the provided cable ties. Install the provided 4-flat dust cover to help prevent corrosion.
Drilling may be required for the ground wire connection. If a suitable existing screw or bolt is not available on the vehicle frame, you must drill a 3/32" pilot hole for the ground screw. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. The area should be free from rust, dirt, and paint—use an abrasive pad or paper to clean it.
The Curt 56500 has the following electrical ratings: Signal circuits (turn signals) are rated at 3.0 amps per side, and Tail/Running circuits are rated at 6.0 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating, and potential fire.
The battery connection must be fuse-protected with a 10-amp maximum fuse. The fuse holder with a 10-amp fuse is provided with the product. Install the fuse after all other installation steps are complete. Exceeding this fuse rating can cause loss of warranty, overheating, and potential fire.
Use 12 GA (12-gauge) wire or larger for the power connection from the vehicle battery to the converter. The black power wire provided with the Curt 56500 is 12 GA. When passing the wire through sheet metal, use an existing grommet, add a grommet, or use silicone to protect the wire from sharp edges.
If drilling is necessary for the ground wire connection, drill a 3/32" pilot hole. The area should be free from rust, dirt, and paint—use an abrasive pad or paper to remove rust and paint before securing the white ground wire with the ring terminal.
The Curt 56500 harness uses the following wire colors: Yellow = Left turn signal, Green = Right turn signal, Red = Brake signal, Brown = Taillight (running lights). The yellow wire connects to the driver side taillight connector, and the green wire connects to the passenger side taillight connector. The red brake wire must be grounded if the converter is used as a powered module for a two-wire system.
P3 is located behind the driver side taillight housing, inside of the trunk. P4 is located behind the passenger side taillight housing, inside of the trunk. These are the primary wiring locations where the Curt 56500 harness connects to the vehicle's taillight connectors.
Disconnect the negative battery terminal before beginning installation and fasten this wire down and away from the battery. Do not lay tools across the positive battery terminal (typically noted with red covers or a '+' symbol), as this can cause a ground short resulting in sparks and/or electrical shocks. Reconnect the negative battery terminal only after all other installation steps are complete and the fuse has been installed.
Before drilling to create the ground hole, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. Inspect the area thoroughly to ensure there are no wires, fuel lines, brake lines, or other components that could be damaged by drilling.
Once the custom harness is installed, verify that the harness is functioning by attaching the 4-flat connector to any trailer with functioning lights. The taillights on the vehicle to be towed should function along with the taillights on the vehicle that is powering them. You can also use a test light to verify proper function.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Check the converter box mounting, power and ground wire connections, and all taillight harness connections regularly. Inspect the 4-flat connector and dust cover for corrosion or damage before each use.
The Curt 56500 is designed for passenger cars with factory taillight connectors accessible from inside the trunk. It works only on 12-volt negative ground systems. Check your vehicle owner's manual or contact the manufacturer to confirm compatibility before purchasing.
Yes, disconnect the negative battery terminal before starting installation. Reconnect it only after all other steps are complete and the fuse is installed.
The battery connection must use a 10-amp maximum fuse. A fuse holder with 10-amp fuse is included. Install the fuse after all other steps are complete.
Signal circuits (turn signals): 3.0 amps per side. Tail/Running circuits: 6.0 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower.
Disconnect the negative battery terminal before starting. Do not lay tools across the positive battery terminal (risk of short and sparks). Check for hidden items before drilling. Protect the power wire from sharp edges when routing through sheet metal.
First, verify that the harness is functioning by attaching the 4-flat connector to a trailer with functioning lights. The trailer lights should function along with the vehicle's taillights. Check that both taillight connectors (P3 and P4) are fully inserted with locking tabs in place. Verify that the converter box is properly mounted and that the power and ground wire connections are secure. Ensure the 10-amp fuse is installed in the fuse holder. Check that the negative battery terminal is reconnected. If the issue persists, inspect all wire connections for damage or loose connections.
Overheating and blown fuses indicate the product rating is being exceeded. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower. The electrical ratings are: Signal circuits 3.0 amps per side, Tail/Running circuits 6.0 amps total. Exceeding these ratings can cause loss of warranty, overheating, and potential fire. Verify that the trailer lights do not exceed these amperage limits. If the trailer load is too high, the Curt 56500 is not suitable for that trailer.
This indicates a short circuit, likely caused by laying tools across the positive battery terminal or an improper ground connection. Immediately disconnect the negative battery terminal and do not attempt to use the product. Do not lay tools across the positive battery terminal (typically noted with red covers or a '+' symbol), as this can cause a ground short resulting in sparks and electrical shocks. Verify that the white ground wire with ring terminal is properly secured to a clean, rust-free grounding point on the vehicle frame. Ensure the power wire is not damaged or pinched. If the problem persists, contact the manufacturer before attempting further installation.
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