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1985 - 1990 GMC S15
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Always the correct part
We know our products
Quality Products
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Complete CURT Class 2 1-1/4" trailer hitch and 5-flat wiring kit (with 4-way to 5-way adapter for surge brakes) engineered for the 1985 - 1990 GMC S15. 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 Chevy S10, GMC S15 and GMC Sonoma (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 Chevy S10, C10, C20, C30, C1500, K10, K20 and K30 pickup or Suburban and GMC S15, Syclone, C1500, C2500, C3500, K1500, K2500 and K3500 pickup or Suburban and Isuzu Hombre (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 888-634-94941 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 1985 - 1990 | GMC S15 | — |
The 85 - 90 GMC S15 Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12011 (Part #5W-CHW-1510) fits 1985-1990 GMC S15 models. The 1990 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the 85 - 90 GMC S15 Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12011 (Part #5W-CHW-1510) is designed to fit the 1985-1990 GMC S15.
The 85 - 90 GMC S15 Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12011 (Part #5W-CHW-1510) fits the following vehicles: 1985-1990 GMC S15. Always verify your specific year, make, and model before ordering.
The 85 - 90 GMC S15 Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12011 (Part #5W-CHW-1510) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Yes, the Curt 12011 receiver hitch fits 1983–2004 Chevrolet and GMC S-10, S-15, and Sonoma pickups, including Sport Side models, as well as 1996–2000 Isuzu Hombre. Your 1995 S-10 is within the supported model years.
Yes, the Curt 12011 is designed for 1983–2004 Chevrolet and GMC S-10, S-15, and Sonoma pickups. The manual includes specific installation instructions for step bumper models, which apply to your 1999 Sonoma.
Yes, the Curt 12011 is compatible with 1996–2000 Isuzu Hombre pickups.
The Curt 12011 has a gross load capacity of 3500 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, which may be lower.
The Curt 12011 is designed for use with ball mount part number D-19 / 45519.
The kit includes: 6 M12×1.75 hex head cap screws (HHCS) class 10.9, 12 flat washers (1/2"), 6 lock washers (1/2"), and 6 hex nuts (M12×1.75 class 10). These fasteners are used to attach the hitch to the frame and bumper brackets.
No, drilling is not required. The Curt 12011 is designed to use existing frame and bracket holes.
Yes, for step bumper models you must remove the bumper, though the brackets remain attached to the frame. For bumper bracket configuration models (1994–1997), you remove the bumper bracket bolts. The installation process differs slightly depending on your model year and bumper type.
The manual notes that some spare tires may need to be lowered and repositioned for hitch installation. If your vehicle uses an early model cradle storage system for the spare tire, you may need to cut off part of the carrier along the frame edge. Consult the manual's Step Bumper Models section for details on this modification.
The manual does not specify required tools. However, installation involves removing and reinstalling bumpers and brackets, disconnecting bumper wiring, and tightening M12 fasteners to 79 lb.-ft, so you will need standard wrenches, sockets, and a torque wrench. Consult a professional installer if you are unsure about bumper removal or wiring work.
1. Remove the bumper, leaving brackets attached to the frame. Disconnect bumper wiring and remove wiring guides from the brackets. 2. Remove bumper brackets from the frame. 3. If using a cradle spare tire storage system, mark and cut the carrier 1/8" inboard of the outer frame edge, then lower the spare tire. 4. Position the receiver on the frame and loosely install bumper brackets using 3 M12 bolts and fasteners per side. 5. Reinstall the bumper on the bumper brackets with original bolts and 1/2" washers as spacers (pre-1994 models only). 6. Raise the spare tire and secure it. Reconnect bumper wiring. 7. Torque all fasteners to 79 lb.-ft.
1. Remove bumper bracket bolts and return them to the vehicle owner. 2. Position the hitch on the frame and install fasteners as shown in the diagram.
Three M12 bolts and fasteners are used per side (6 total) to attach the receiver brackets between the bumper brackets and frame.
Yes, if you have a pre-1994 model, use three 1/2" flat washers at each bolt location as spacers between the bumper brackets and bumper when reinstalling the bumper.
All fasteners must be torqued to 79 lb.-ft.
The fasteners are M12×1.75 hex head cap screws (class 10.9) with matching M12×1.75 hex nuts (class 10). Flat washers (1/2") and lock washers (1/2") are also used.
Install fasteners loosely first. Step 4 of the Step Bumper Models instructions states to "loosely install" the bumper brackets. Only after the bumper is reinstalled and the spare tire is raised should you torque all fasteners to 79 lb.-ft in step 7.
The hitch has a gross load capacity of 3500 lbs trailer weight and 350 lbs tongue weight. However, you must not exceed your vehicle manufacturer's recommended towing capacity, which may be lower than the hitch rating. Always follow your vehicle's towing limits.
Periodically check that all fasteners are tight and that all structural components are sound. This helps ensure safe operation and extends the life of the hitch.
Yes, if your vehicle uses an early model cradle storage system for the spare tire, you must mark the spare tire carrier 1/8" inboard of the outer frame edge and cut off the carrier along that line to allow hitch installation. After cutting, lower the spare tire, install the hitch, then raise and secure the spare tire.
Yes, cutting the spare tire carrier is a permanent modification. The manual instructs you to cut off the carrier along a marked line 1/8" inboard of the outer frame edge. This modification cannot be reversed.
The Curt 12011 fits 1983–2004 Chevrolet and GMC S-10, S-15, and Sonoma pickups (including Sport Side), and 1996–2000 Isuzu Hombre.
3500 lbs trailer weight and 350 lbs tongue weight, but do not exceed your vehicle manufacturer's recommended towing capacity.
No, drilling is not required.
All fasteners must be torqued to 79 lb.-ft.
Some spare tires may need to be lowered and repositioned. Early model vehicles with cradle spare tire storage may require cutting the carrier 1/8" inboard of the outer frame edge.
Periodically check that all fasteners are tight and that all structural components are sound.
The Curt 55312 T-connector is designed for Chevrolet Blazer, Chevrolet C/K Series Pickup, Chevrolet S-10 Pickup, Chevrolet Suburban, GMC C/K Series Pickup, GMC Sonoma Pickup, GMC Jimmy, GMC Suburban, GMC Syclone, and Isuzu Hombre. Verify your vehicle model matches this list before purchasing.
The taillight wiring harness location T3 is located between the driver's side frame rail and the spare tire. This is where you will insert the T-connector.
Locate the vehicle's taillight wiring harness at location T3 between the driver's side frame rail and spare tire. Separate the vehicle's connectors carefully without damaging the locking tabs. Insert the T-connector between the separated connectors, ensuring both connectors are fully inserted with locking tabs in place.
Locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle's frame. If no suitable point exists, drill a 3/32" hole and secure the white wire using the eyelet and screw provided in the kit.
Drilling is not always required. If a suitable grounding point exists near the connector (such as an existing screw with nut in the vehicle's frame), you can use that. If no suitable point is available, you will need to drill a 3/32" hole for the ground wire.
Drill a 3/32" hole if a suitable existing grounding point is not available. Secure the white wire using the eyelet and screw provided.
Route the 4-flat connector to the center of the vehicle and secure it in a convenient location that is out of the way.
Secure any loose wires using the cable ties provided in the kit.
Before drilling, verify that miscellaneous items hidden behind or under any surface will not be damaged. This precaution avoids damage to vehicle components and personal injury.
The Curt 55312 fits Chevrolet Blazer, C/K Series Pickup, S-10 Pickup, and Suburban; GMC C/K Series Pickup, Sonoma Pickup, Jimmy, Suburban, and Syclone; and Isuzu Hombre.
Drilling is optional. If an existing screw with nut is available on the vehicle frame near the connector, use that for grounding. Otherwise, drill a 3/32" hole.
The kit includes a T-connector, white wire with eyelet, screw, and cable ties. The manual does not specify additional components.
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