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| Receiver Tube Size | 1-1/4 IN |
| Side Application Type Description | Blank |
| Tongue Weight (TW) | 350 LB |
| Warranty | Limited Lifetime Warranty (One-Year Finish, One-Year Parts) |
| Weight Carrying Capacity (WC) | 3,500 LB |
| Finish | GLOSS BLACK POWDER COAT |
| Main Body Shape | Square |
| Material | Carbon Steel |
| Mount Type Description | Blank |
| Battery-Powered | Yes |
| Converter Type | Circuit Protected, Powered, Potted |
| Electrical System Type | 2W |
| Finish | N/A |
| Material | Blank |
| Mount Type Description | Blank |
| Output Type | 4-Way Flat |
| Side Application Type Description | Blank |
| T-Connector Location | P1,P2 |
| Tail Light Circuits | 6.0 Amps |
| Turn and Brake Circuits | 3.0 Amps |
| Warranty | One-Year Limited Warranty |
| Side Application Type Description | Blank |
| Tongue Weight (TW) | 350 LB |
| Warranty | Limited Lifetime Warranty (One-Year Finish, One-Year Parts) |
| Drop | 3-1/4 IN |
| Finish | GLOSS BLACK POWDER COAT |
| Gross Trailer Weight (GTW) | 3,500 LB |
| Material | Blank |
| Mount Type Description | Blank |
Notes:
Notes:
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 888-634-94941 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2018 - 2020 | Buick Regal Sportback | Excluding AWD |
The 18-20 Buick Regal Sportback Excluding AWD 1.25 CURT Trailer Hitch + Assure Proportional Brake Controller Kit HBCW210 (Part #HBCW210) fits the following vehicles: 2018-2020 Buick Regal Sportback. Always verify your specific year, make, and model before ordering.
Yes, the 18-20 Buick Regal Sportback Excluding AWD 1.25 CURT Trailer Hitch + Assure Proportional Brake Controller Kit HBCW210 (Part #HBCW210) is designed to fit the 2018-2020 Buick Regal Sportback.
The 18-20 Buick Regal Sportback Excluding AWD 1.25 CURT Trailer Hitch + Assure Proportional Brake Controller Kit HBCW210 (Part #HBCW210) fits 2018-2020 Buick Regal Sportback models. The 2020 model year is the last year covered by this part number. For newer models, check for an updated version.
The 18-20 Buick Regal Sportback Excluding AWD 1.25 CURT Trailer Hitch + Assure Proportional Brake Controller Kit HBCW210 (Part #HBCW210) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Yes, CURT hitch 12173 is designed for 2018-Present Buick Regal Tour X Wagon models. Confirm your vehicle matches this specification before purchasing.
The hitch has a gross load capacity of 3,500 lbs trailer weight and 350 lbs tongue weight when used as a weight-carrying hitch. You must never exceed your vehicle manufacturer's recommended towing capacity.
The hitch weight is 40 lbs.
The hitch is designed for use with ball mount #45521 (Euro mount). Optional ball mounts are available: #45571 (1 7/8" ball) and #45572 (2" ball).
Required tools are: ratchet, torque wrench, 8" socket extension, 7mm socket, 13mm socket, 15mm socket, 11/16" socket, masking tape, aviation shears, needle nose pliers, and safety glasses. Using proper tools will greatly improve the quality of the install and reduce installation time.
The hitch includes: (4) M10x1.5 flange nuts (20-00164), (4) 7/16" fishwire (7_16 FISHWIRE), (4) 7/16-14 UNC 1-1/2" carriage bolts grade 8 (10-10282), (4) 7/16-14 UNC grade 8 serrated flange nuts (20-00103), (4) .250 x .88 x 2.25" square hole spacers (CM-SP2), (2) .250 x 1.50 x 2.00" square hole spacers (CM-SP1), and (4) M10x1.5 65mm hex head cap screws class 8.8 (10-10125).
Two people may be required to ease installation. If you are hesitant to undertake this task on your own, contact an authorized CURT installer for additional assistance.
Professional installation takes approximately 38 minutes. Novice (DIY) installation takes approximately 40 minutes.
No, drilling is not required. The installation uses existing mounting holes on the frame rails.
Two trimming tasks are required: (1) Trim the heat shield using aviation shears as shown in the Heat Shield Trim Diagram (approximately 12.00" x 2.50" area). (2) Optionally trim the center fascia tab as shown in the Fascia Tab Trim Diagram (approximately .250" cut line) to ease installation. All dimensions are approximate; confirm fit prior to trimming.
Installation sequence: (1) Lower exhaust by removing 2 bolts on each side using 15mm socket; support exhaust to avoid damage. (2) Remove heat shield using needle nose pliers to loosen speed nuts, trim using aviation shears, and reinstall. (3) Fishwire 2 carriage bolts and 2 CM-SP2 spacers through access hole and out mounting holes on each side. (4) Remove 1 screw on each side using 7mm socket from rear fascia. (5) Raise hitch into position and secure using 2 flange nuts on each side. (6) Reinstall exhaust bracket on hitch mounting plate using 2 M10x70 bolts and 1 CM-SP1 spacer on each side. (7) Torque all hardware.
Fishwire is a technique used to thread fasteners through tight spaces. For this hitch, you use the 7/16" fishwire (included) to thread 2 carriage bolts and 2 CM-SP2 spacers through the access hole and out the mounting holes on each side of the frame rail. Refer to the Fishwire Technique Diagram in the manual for the detailed procedure.
No, you only need to lower the exhaust. Remove the 2 bolts attaching the exhaust bracket to the rear of the vehicle on each side using a 15mm socket. Support the exhaust to avoid damage. After installing the hitch, reinstall the exhaust bracket on the hitch mounting plate.
Torque all 7/16" hardware to 59 ft-lbs and all M10 hardware to 45 ft-lbs. This includes the 7/16" carriage bolts and flange nuts, and the M10x1.5 hex head cap screws.
Wear safety glasses at all times while installing this product. Support the exhaust to avoid damage when lowering it. Before beginning installation, read all instructions thoroughly. If you are hesitant to undertake this task on your own, contact an authorized CURT installer for additional assistance.
All non-trailer (wheel-less) loads applied to this hitch must be supported by 18050 stabilizing straps. See the CURT catalog or visit www.curtmfg.com for further information.
Periodically check this receiver hitch to ensure all fasteners are tight and all structural components are sound. This ongoing maintenance is important for safe operation.
CURT Manufacturing warrants this product to be free of defects in material and/or workmanship at the time of retail purchase by the original purchaser. If the product is found to be defective, CURT may repair or replace it at their option when returned prepaid with proof of purchase. Alteration to, misuse of, or improper installation voids the warranty. CURT's liability is limited to repair or replacement of defective products and excludes liability for incidental or consequential loss or damage.
Yes, CURT 12173 is designed for 2018-Present Buick Regal Tour X Wagon models.
3,500 lbs trailer weight and 350 lbs tongue weight. Never exceed your vehicle manufacturer's recommended towing capacity.
No drilling is required. Heat shield and fascia trimming using aviation shears is required.
Ratchet, torque wrench, 8" socket extension, 7mm/13mm/15mm/11/16" sockets, masking tape, aviation shears, needle nose pliers, and safety glasses.
Professional installation: 38 minutes. Novice DIY installation: 40 minutes.
7/16" hardware: 59 ft-lbs. M10 hardware: 45 ft-lbs.
The kit includes: one 30 amp auto-resetting circuit breaker, two #10 ring terminals, two 3/8" ring terminals, two 1/2" ring terminals, three 12-10 gauge butt connectors, 10 feet of 10 ga black/white duplex wire, 20 feet of 10 ga blue cross-linked wire, and eight 8.5" cable ties.
Yes, but with a critical difference: these vehicles require the stop signal wire to be spliced to the light green wire on the turn signal harness connector under the dash, not to the brake pedal switch. Do NOT connect to the red wire with green stripe, as serious damage may occur. All other vehicles connect to the brake pedal switch instead.
You will need: a test light, wire stripper/cutter, crimp tool, and 3/8" box end wrench. The test light is used to identify the cold (switched) side of the brake pedal switch.
Yes. The manual cautions to disconnect the tow vehicle's negative battery cable before installation. Reconnect it only in the final step after all wiring is complete.
Mount the 30 amp circuit breaker near the tow vehicle's positive battery terminal. This keeps the power wire run as short as possible and protects the circuit.
Use 10 gauge (10 ga) black wire from the duplex wire included in the kit. Strip 3/8" of insulation from each end. Crimp a #10 ring terminal to the end that attaches to the circuit breaker stud labeled 'BAT', and a 3/8" or 1/2" ring terminal (sized to fit your battery terminal) to the end that attaches to the positive battery terminal.
Feed the 10 ga duplex wire from the brake controller in the cockpit through the firewall into the engine compartment toward the battery. Cut to length as needed. At the battery end, crimp a 3/8" or 1/2" ring terminal to the white wire and a #10 ring terminal to the black wire. Attach the black wire to the circuit breaker stud labeled 'AUX' and tighten the nut with a 3/8" box end wrench.
When passing the duplex wire through the firewall into the engine compartment, use an existing grommet, add a new grommet, or fill the hole with silicone rubber to insulate and protect the wire. The same protection applies when passing the blue cross-linked wire through any sheet metal at the rear of the vehicle.
In the cockpit, attach the black duplex wire to the brake controller's battery wire (typically black) and the white duplex wire to the brake controller's ground wire (typically white). Use either one of the supplied yellow butt connectors or solder the leads together and insulate with heat shrink tubing.
Locate the brake pedal switch on the back side of the vehicle's brake pedal. Use a test light or volt meter to identify the 'cold' or switched side—this terminal will only show power when the brake pedal is depressed. Attach the stop signal wire (typically red) from the brake controller to the cold side of the switch using a wire tap.
Locate the semi-circle turn signal harness connector on the steering column under the dash. It has two rows of wires: a row of four and a row of seven. Attach the stop signal wire (typically red) from the brake controller to the light green wire using a wire tap. Do NOT connect to the red wire with green stripe, as serious damage may occur.
Feed the 10 ga blue cross-linked wire from the brake controller to the trailer connector at the rear of the vehicle, taking up any slack in the wire. When passing through any sheet metal, use an existing grommet, add a new grommet, or fill the hole with silicone rubber to protect the wire.
Attach the blue cross-linked wire to the brake controller's electric brake wire (typically blue) using one of the supplied yellow butt connectors or by soldering and insulating with heat shrink tubing. At the rear of the vehicle, trim any loose blue wire and attach it to the trailer connector's electric brake terminal. Refer to the trailer connector's wiring diagram for the correct terminal location.
Secure any loose wires with the cable ties provided. Connect the black power wire from the circuit breaker to the positive side of the battery. Connect the white ground wire from the brake controller to the negative side of the battery. Finally, reconnect the tow vehicle's negative battery cable to the battery.
The circuit breaker is 30 amps and auto-resetting. It must be mounted near the positive battery terminal and connected directly to the positive battery terminal via the included black 10 gauge wire.
Use a 3/8" box end wrench to tighten the nuts on the circuit breaker studs labeled 'BAT' and 'AUX'.
The kit includes 10 feet of 10 gauge black/white duplex wire for the battery and brake controller connections, and 20 feet of 10 gauge blue cross-linked wire for the electric brake signal to the trailer connector.
Black wire connects to the positive battery and circuit breaker. White wire connects to the brake controller ground and negative battery. Red wire is the stop signal wire from the brake controller. Blue wire is the electric brake signal wire. The manual notes these are 'typically' these colours but recommends confirming with your brake controller documentation.
Yes. You can solder the leads together and insulate with heat shrink tubing as an alternative to using the supplied yellow butt connectors. This applies to connections between the duplex wire and the brake controller wires, and between the blue cross-linked wire and the brake controller.
The black power wire must connect directly to the positive battery terminal via the 30 amp circuit breaker. Connecting to the fuse panel or any other accessory wiring may damage vehicle wiring and cause trailer brake failure. The circuit breaker protects the circuit and must be the only protection between the battery and the brake control system.
Do NOT connect the stop signal wire to the red wire with green stripe on the turn signal harness. Serious damage may occur. Connect only to the light green wire. Also, do not connect to the brake pedal switch on these vehicles; use the turn signal harness instead.
The kit is universal but requires an existing trailer connector and brake controller. 1989-1991 Ford E & F-Series with ABS use a different stop signal connection (turn signal harness instead of brake pedal switch). Consult your brake controller documentation for compatibility.
No drilling is required. The kit connects to existing components: the battery, brake controller, brake pedal switch (or turn signal harness on 1989-1991 Ford E & F-Series with ABS), and trailer connector.
Do NOT connect the stop signal wire to the red wire with green stripe on the turn signal harness—serious damage may occur. Connect to the light green wire instead, and do not use the brake pedal switch.
Connecting to the fuse panel or accessory wiring may damage vehicle wiring and cause trailer brake failure. The 30 amp circuit breaker must be the only protection between the battery and the brake control system.
Yes, the Curt 56389 is designed for the Buick Regal TourX passenger car. The harness connects behind the driver and passenger side taillight housings, outside the trunk.
The harness is rated for 3.0 amps per side on signal circuits and 6.0 amps total on tail/running circuits. Do not exceed these ratings or the tow vehicle lamp load rating, whichever is lower. Exceeding the rating can cause loss of warranty, overheating and potential fire.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding this specification can cause loss of warranty, overheating and potential fire.
Required tools are: 10mm socket, socket extension, ratchet, trim panel removal tool, Phillips screwdriver, side cutter, wire crimper, wire stripper, and fish wire.
The manual does not specify whether the battery must be disconnected. Contact the vehicle manufacturer or Curt Manufacturing for this safety requirement.
Open the vehicle hatch. Remove the two fasteners securing the taillight in place using a 10mm socket. Gently pull the taillight rearward, taking care not to damage the alignment tabs. The vehicle taillight wiring harness connectors will be visible on the backside of the taillight housing. Separate these connectors from the taillight, taking care not to damage the locking tabs.
Route the custom wiring harness with the yellow wire from underneath the vehicle along the rear bumper and up behind the fender to the opening underneath the removed driver side taillight. Insert the harness end with the yellow wire between the separated connectors, ensuring the connectors are fully inserted with locking tabs in place. Repeat this process on the passenger side, routing the harness end with the green wire along the rear bumper.
Locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle frame. If no existing screw is available, drill a 3/32" pilot hole for the provided screw. The area must be free of rust, dirt and paint. Secure the white ground wire using the ring terminal and provided screw.
Drilling may be required. If a suitable existing screw with nut is not available in the vehicle frame near the taillight connector, you must drill a 3/32" pilot hole for 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.
Locate a flat, clean surface along the vehicle rear bumper that is out of the path of spray and debris from the rear wheels and road. Adhere the black converter box using the provided double-sided tape and cable ties. Failure to mount the box in a protected area can cause loss of warranty, product failure, overheating and potential fire.
Route the black power wire from the vehicle battery as shown on the included CME-PCL-INS sheet. Refer to that sheet for specific routing instructions.
When not in use, roll up the 4-flat connector and store it in a convenient, out-of-the-way location. When in use, route it to the center of the vehicle. Secure any loose wires with the provided cable ties.
Test for proper function by using a test light or connecting a properly wired trailer. All steps must be followed to ensure the wiring harness functions properly.
Reinstall all items removed during installation. Install the provided 4-flat dust cover to help prevent corrosion. Test the harness for proper function using a test light or a properly wired trailer.
The Curt 56389 is designed for the Buick Regal TourX passenger car.
You need a 10mm socket, socket extension, ratchet, trim panel removal tool, Phillips screwdriver, side cutter, wire crimper, wire stripper, and fish wire.
The battery connection must be fuse-protected with a 10-amp maximum fuse.
Drilling may be required if no existing screw with nut is available in the vehicle frame. If needed, drill a 3/32" pilot hole for the provided ground screw.
Mount the black converter box on a flat, clean surface along the rear bumper, away from spray and debris from the rear wheels and road, using the provided double-sided tape and cable ties.
Test for proper function using a test light or by connecting a properly wired trailer.
The 4-way flat electrical adapter converts a vehicle's 4-way flat trailer connector to other trailer connector types (6-way round, 7-way RV blade, or dual 4-way flat). This allows you to tow trailers with different connector styles. Single-output models (57184, 57183, 57185, 57626, 57676) convert to one connector type; dual-output models (57604, 57624, 57672, 57674, 57102) provide two different connector outputs simultaneously.
Yes. Your vehicle must be equipped with a 4-way flat trailer connector. If your vehicle does not have one, you will need to install a custom wiring harness or other 4-way flat trailer connector before installing this adapter.
Both convert a 4-way flat connector to a 7-way RV blade. The difference is that 57185 includes a mounting bracket, while 57184 does not.
Both convert a 4-way flat connector to a 6-way round. The difference is that 57626 includes a mounting bracket, while 57183 does not.
Curt offers three dual-output models that provide both a 4-way flat and a 7-way RV blade output: part numbers 57672, 57674, and 57102. All three include a mounting bracket.
Curt offers two dual-output models that provide both a 4-way flat and a 6-way round output: part numbers 57604 and 57624. Both include a mounting bracket.
You will need: a 1/8" drill bit, drill, Phillips screwdriver, wire stripper, cutting tool, terminal crimpers, and a test light. The manual also lists three self-tapping screws (#10 - 1/2") as required, though these are not included with the product.
No. The three self-tapping screws (#10 - 1/2") used to attach the mounting bracket are not included and must be purchased separately.
Mount the combination harness in a location on the tow vehicle that is within reach of the trailer's wiring harness and near the center of the vehicle. The mounting bracket (if included) should be attached to the vehicle's bumper or other suitable surface.
Yes. You must drill two 1/8" holes: one for the grounding point and one (or more) for the mounting bracket. Before drilling, you must check for brake lines, fuel lines, wiring and other components that may be hidden behind or under the surface to avoid damage.
No. You must never attach the mounting bracket directly to the hitch by cutting, welding or drilling into the hitch. Mount it to the vehicle's bumper or other suitable surface instead.
The adapter uses four wires: Yellow (auxiliary or back-up lights), Blue (electric brakes), Black (positive power with appropriate inline fuse), and White (ground). All wires except black and white must be connected using 12 gauge (minimum) wire and butt connectors to the appropriate vehicle functions.
The white wire is the ground connection. It must be attached with a ring terminal to a 1/8" hole drilled in a suitable grounding point on the vehicle using a #10 - 1/2" self-tapping screw. This ground connection is required for the harness to work properly. The white wire on the vehicle's 4-way flat connector does not support the ground (-) functions of the combination harness.
Yes. The black wire (positive power) must be connected with an appropriate inline fuse. The manual does not specify the fuse amperage rating.
Use 12 gauge (minimum) wire for all connections. The manual specifies this minimum gauge for the remaining wires (yellow, blue, and black) when connecting to appropriate vehicle functions.
Failing to properly ground the product can cause loss of warranty, overheating and potential fire. The white wire must be securely attached to a clean grounding point using a #10 - 1/2" self-tapping screw in a 1/8" hole. The area must be clean of dirt, debris or undercoating.
Before drilling, you must check for brake lines, fuel lines, wiring and any other components that may be hidden behind or under the surface. Drilling into these components can cause damage and personal injury.
Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower. Exceeding either rating can cause damage or unsafe operation.
Confirm proper function with a test light or by using a properly functioning trailer. This verifies that all connections are working correctly before towing.
Secure any loose wires using cable ties or equivalent product to prevent them from moving, catching on components, or becoming damaged.
Your vehicle must have a 4-way flat trailer connector. If it does not, you will need to install a custom wiring harness or other 4-way flat connector first. Check the part number table to confirm the adapter converts to the connector type you need.
You must purchase three #10 - 1/2" self-tapping screws for the mounting bracket. You will also need an appropriate inline fuse for the black (positive power) wire; the manual does not specify the amperage.
Yes, you must drill two 1/8" holes: one for grounding and one for the mounting bracket. Before drilling, check for brake lines, fuel lines and wiring behind the surface. Never drill into the hitch.
Yellow = auxiliary/back-up lights; Blue = electric brakes; Black = positive power (needs inline fuse); White = ground (must be properly grounded or warranty is void and fire risk exists). Use 12 gauge minimum wire and butt connectors.
Proper grounding of the white wire is critical. Failing to ground it properly can cause loss of warranty, overheating and fire. The grounding point must be clean of dirt, debris and undercoating.
Test with a test light or by using a properly functioning trailer to confirm all connections work. Secure loose wires with cable ties.
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