For 1978‑1987 Oldsmobile Cutlass Supreme Trailer Hitch + Wiring 5 Pin Fits All Models Curt 12005 1‑1/4 Tow Receiver
Model: 12005 58044 57187 58303-CH3152This Trailer Tow Hitch + 5-Flat Fits The Following Vehicles:
1978 - 1987 Oldsmobile Cutlass Supreme All Models
This Trailer Tow Hitch + 5-Flat Includes the Following Parts:
- Class 2 Hitch, 1-1/4" (Easy Bolt-On, No Drilling)
- 4-Way Flat Connector Plug w/ 60" Wires & Hardware (Requires Splicing)
- 4-Way to 5-Way Flat Install Kit for Boat Trailer Surge and Connector Mounting Bracket for 5-Way Flat
- Installation instructions, schematics, diagrams, and hardware (if required).
List of Fitment Years:
1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
CURT 12005 Class 2 Trailer Hitch, 1-1/4-Inch Receiver
Manufactured by: Curt
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..
Features:
- Rated to 3,500 lbs. gross trailer weight and 350 lbs. tongue weight
- Engineered with a vehicle-specific design for a custom fit
- Tested for safety in accordance with SAE J684
- Precisely welded for superior strength and fit
- Protected by a durable high-gloss black powder coat finish
- Co-cured in a rust-resistant liquid A-coat, inside and out
- Equipped with an open-back receiver for easy cleaning
- Limited lifetime warranty (one-year finish, one-year parts)
- Made in USA (may include imported hardware)
CURT 58044 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 60-Inch Wires
Manufactured by: Curt
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer This 4-way flat connector is designed to supply power for tail lights, turn signals and brake lights, as well as a ground connection.
It features durable rubber-molded construction and is made with 60" of standard color-coded, bonded wire It also includes snap locks and all necessary installation hardware to easily splice into your vehicle's wiring system This 4-way flat connector is a female-end socket, specifically designed for the car side of the connection.
It is compatible with all 2-wire vehicle systems..
Features:
- Splices into vehicle wiring to provide a connection for a trailer plug
- 4-way flat output connects tail lights, brake lights and turn signals
- Constructed with bonded 16-gauge wires and durable molded rubber
- Features 60" of color-coded wire for easier installation
- Snap locks included for fast, secure splicing
- Designed for use on vehicles and trailers with two-wire systems
CURT 57187 4-Way to 5-Way Flat Adapter for Boat Trailer Surge Brakes and CURT 58303 Vehicle-Side Trailer Wiring Harness Mounting Bracket for 5-Way Flat
Manufactured by: Curt
CURT electrical connector brackets provide a simple solution for mounting wiring to your trailer hitch on the rear of your vehicle Connector wires can be a nuisance when they are just lying around; they can get tangled up with cargo and even damaged An electrical connector left to hang off the back end of your vehicle is an even greater hazard.
Secure, protect, and optimize the use of your electrical connector by mounting it with a CURT connector bracket This trailer wire connector bracket is designed to hold a 5-way flat socket It features sturdy steel construction with a black finish and can be mounted on your vehicle or trailer hitch using the included hardware.
This electrical adapter is designed to adapt a 4-way flat vehicle socket to fit a 5-way flat trailer plug It is specifically intended for boat trailers with surge brakes, adding in a fifth wire for the reverse lights and allowing your vehicle's 4-way flat to easily plug into your boat trailer 5-way flat This boat trailer wiring adapter features durable molded plastic construction and requires some splicing.
All CURT wiring and electrical products come with a one-year limited warranty to give you the assurance you need to tow with confidence..
Features:
- Adapts vehicle 4-way flat to plug into boat trailer 5-way flat
- Intended for boat trailers with surge brakes
- Fifth wire splices in to connect reverse lights
- Adapts 4-way flat vehicle socket to fit 5-way flat trailer plugs
- Durable molded plastic housing resists corrosion
- Securely mounts a 5-way flat connector socket
- Allows for attachment to the vehicle or trailer hitch
- Constructed from high-strength steel
- Protected by a durable black powder coat finish
Hitches Near Me: We operate out of several warehouses across the country, ensuring faster delivery to your location.
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Product Details
- Brand: Curt
- Model: 12005 58044 57187 58303-CH3152
- Includes: Class 2 Trailer Tow Hitch, 4-Way Flat Connector Socket with 60" Wires, 4-Way to 5-Way Flat Adapter for Boat Trailer Surge Brakes, Connector Mounting Bracket for 5-Way Flat
Compatibility Chart
Description
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For 1978-1987 Oldsmobile Cutlass Supreme Trailer Hitch + Wiring 5 Pin Fits All Models Curt 12005 1-1/4 Tow Receiver Install Notes
Installation Instructions for 78-87 Buick Regal RWD, 78-81 Century Sedan and Wagon, 77-88 Chevrolet Monte Carlo, 78-88 El Camino, 78-83 Oldsmobile Cutlass Ciera Cruiser, 78-88 Cutlass Supreme, 82-86 Pontiac Bonneville, 78-87 Grand Prix, and 78-81 Montana
Part Numbers:
- 12005
Wiring Access Location:
Not specified.
Tools Required:
- Torque wrench
- Drill (for enlarging holes)
Step-by-Step Instructions:
- Remove three lower bolts attaching the E/A unit to the frame. Two bolts are on the passenger side, and one is on the driver side.
Note: On station wagon models, remove the center-most bolt from the bottom of the bumper. - Enlarge E/A bolt holes using a 3/8" drill bit.
- Position the hitch on the vehicle. Install 3/8" bolts and washers through the hitch and enlarged E/A attachment holes. Loosely install flat washers and locknuts as shown.
- Fishwire 1/2" carriage bolts and spacer blocks through frame access holes and down through tie-down slots in each frame rail.
Note: For El Camino and Caballero models, remove the bumper with the E/A assembly to fishwire bolts from the rear frame opening. Install remaining fasteners as shown. - Torque 1/2" fasteners to 110 lb-ft and 3/8" fasteners to 45 lb-ft.
Hardware List:
- Bolt, Carriage, 1/2-13 UNC, 2-1/4, Grade 8, YZ: Qty 2 (Part No. 10-10304)
- Washer, Flat, 1/2, YZ: Qty 2 (Part No. 30-00133)
- Washer, Lock, 1/2, YZ: Qty 2 (Part No. 30-00153)
- HHCS, 3/8-16 UNC, 1-1/4, Grade 8, YZ: Qty 4 (Part No. 10-10339)
- Washer, Flat, 3/8, YZ: Qty 4 (Part No. 30-00186)
- .250 x 1.50 x 2.00" Square Hole Spacer: Qty 2 (Part No. CM-SP332)
- Nut, Hex, 1/2-13 UNC, Grade 8, YZ: Qty 2 (Part No. 20-00171)
- Nut, Nyl Lock, 3/8-16 UNC, Grade 8, YZ: Qty 4 (Part No. 20-00146)
- 1/2" Fishwire: Qty 1
Safety Notes:
- Gross Load Capacity: 3,500 lbs (trailer weight), 350 lbs (tongue weight).
- Do not exceed the vehicle manufacturer's recommended towing capacity.
- All non-trailer loads applied to this product must be supported by 18050 stabilizing straps.
- Failure to properly support non-trailer loads will void the product warranty.
- Periodically check this receiver hitch to ensure all fasteners are tight and structural components are sound.
Specifications:
- Hitch Weight: Not specified.
- Installation Time:
- Professional: 44 minutes
- Novice (DIY): 45 minutes
- Hole enlargement is required.
Manufacturer Notes:
- Designed for use with ball mount #D-20 / 45520.
- Warranty covers defects in material and workmanship at the time of purchase.
- Alterations, misuse, or improper installation voids the warranty.
- For technical support, call Curt Manufacturing at 877-287-8634.
Installation Instructions for Compatible Vehicles
Part Numbers:
- 12005
Wiring Access Location:
Not specified.
Tools Required:
- Torque wrench
- Drill (for enlarging holes)
Step-by-Step Instructions:
- Remove three lower bolts attaching the E/A unit to the frame. Two bolts are on the passenger side, and one is on the driver side.
Note: On station wagon models, remove the center-most bolt from the bottom of the bumper. - Enlarge E/A bolt holes using a 3/8" drill bit.
- Position the hitch on the vehicle. Install 3/8" bolts and washers through the hitch and enlarged E/A attachment holes. Loosely install flat washers and locknuts as shown.
- Fishwire 1/2" carriage bolts and spacer blocks through frame access holes and down through tie-down slots in each frame rail.
Note: For El Camino and Caballero models, remove the bumper with the E/A assembly to fishwire bolts from the rear frame opening. Install remaining fasteners as shown. - Torque 1/2" fasteners to 110 lb-ft and 3/8" fasteners to 45 lb-ft.
Hardware List:
- Bolt, Carriage, 1/2-13 UNC, 2-1/4, Grade 8, YZ: Qty 2
- Washer, Flat, 1/2, YZ: Qty 2
- Washer, Lock, 1/2, YZ: Qty 2
- HHCS, 3/8-16 UNC, 1-1/4, Grade 8, YZ: Qty 4
- Washer, Flat, 3/8, YZ: Qty 4
- .250 x 1.50 x 2.00" Square Hole Spacer: Qty 2
- Nut, Hex, 1/2-13 UNC, Grade 8, YZ: Qty 2
- Nut, Nyl Lock, 3/8-16 UNC, Grade 8, YZ: Qty 4
- 1/2" Fishwire: Qty 1
Safety Notes:
- Gross Load Capacity: 3,500 lbs (trailer weight), 350 lbs (tongue weight).
- Do not exceed the vehicle manufacturer's recommended towing capacity.
- All non-trailer loads applied to this product must be supported by stabilizing straps.
- Failure to properly support non-trailer loads will void the product warranty.
- Periodically check this receiver hitch to ensure all fasteners are tight and structural components are sound.
Specifications:
- Hitch Weight: Not specified.
- Installation Time:
- Professional: 44 minutes
- Novice (DIY): 45 minutes
- Hole enlargement is required.
Additional Information:
Attention: This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.
Technical Support:
For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
Warranty Information:
Warranty covers defects in material and workmanship for the specified duration. For complete warranty instructions, please download the full installation PDF.
Installation Instructions for Taillight Wiring Converter
Part Numbers:
- 58044
Wiring Access Locations:
- S1: Behind driver’s side taillight housing
- S2: Behind passenger’s side taillight housing
- S3: Behind driver’s side rear access panel
- S4: Behind passenger’s side rear access panel
- T1: Behind driver’s side taillight housing
- T2: Behind passenger’s side taillight housing
- T3: Behind driver’s side rear bumper
- T5: Behind passenger’s side rear bumper
Tools Required:
- Test light
Step-by-Step Instructions:
- Locate the vehicle's taillight wiring using the typical locations based on the vehicle type.
- Using a test light, identify the corresponding wires for:
- Left turn signal
- Right turn signal
- Tail lights
- Brake lights
- Temporarily disconnect the vehicle's negative battery cable.
- Using wire taps, connect the converter input wires to the vehicle harness wires:
- Brown Wire: Tail Light Circuit
- Yellow Wire: Left Turn/Brake Circuit
- Green Wire: Right Turn/Brake Circuit
- Locate a system ground wire:
- Use a terminal ring or tap into an existing ground wire.
- Test the installation:
- If testing with a test light:
- Attach the test light ground lead to the exposed ground terminal of the 4-flat end.
- Activate the left turn, right turn, tail, and brake lights on the vehicle one at a time.
- Probe the 4-flat end receptacles to confirm functionality.
- If testing with a trailer:
- Mate the 4-flat with the trailer and repeat the same tests.
- If any trailer light functions fail, recheck the vehicle wiring with a circuit tester.
- If testing with a test light:
Hardware List:
- 4-flat connector (60” car end):
- White Wire: To Ground
- Green Wire: To Right Turn Signal
- Yellow Wire: To Left Turn Signal
- Brown Wire: To Taillight Signal
Safety Notes:
- Ensure the product is only used on 2-wire, 12-volt negative ground systems.
- Double-check all connections and secure wires to avoid potential hazards.
Specifications:
- Compliance: Designed for 2-wire 12V systems with a negative ground.
- Ensure proper alignment and secure attachment to avoid wiring faults.
Installation Instructions for Taillight Wiring Converter
Part Numbers:
- 58044
Wiring Access Locations:
- S1: Behind driver’s side taillight housing
- S2: Behind passenger’s side taillight housing
- S3: Behind driver’s side rear access panel
- S4: Behind passenger’s side rear access panel
- T1: Behind driver’s side taillight housing
- T2: Behind passenger’s side taillight housing
- T3: Behind driver’s side rear bumper
- T5: Behind passenger’s side rear bumper
Tools Required:
- Test light
Step-by-Step Instructions:
- Locate the vehicle's taillight wiring using the typical locations based on the vehicle type.
- Using a test light, identify the corresponding wires for:
- Left turn signal
- Right turn signal
- Tail lights
- Brake lights
- Temporarily disconnect the vehicle's negative battery cable.
- Using wire taps, connect the converter input wires to the vehicle harness wires:
- Brown Wire: Tail Light Circuit
- Yellow Wire: Left Turn/Brake Circuit
- Green Wire: Right Turn/Brake Circuit
- Locate a system ground wire:
- Use a terminal ring or tap into an existing ground wire.
- Test the installation:
- If testing with a test light:
- Attach the test light ground lead to the exposed ground terminal of the 4-flat end.
- Activate the left turn, right turn, tail, and brake lights on the vehicle one at a time.
- Probe the 4-flat end receptacles to confirm functionality.
- If testing with a trailer:
- Mate the 4-flat with the trailer and repeat the same tests.
- If any trailer light functions fail, recheck the vehicle wiring with a circuit tester.
- If testing with a test light:
Hardware List:
- 4-flat connector (60” car end):
- White Wire: To Ground
- Green Wire: To Right Turn Signal
- Yellow Wire: To Left Turn Signal
- Brown Wire: To Taillight Signal
Safety Notes:
- Ensure the product is only used on 2-wire, 12-volt negative ground systems.
- Double-check all connections and secure wires to avoid potential hazards.
Specifications:
- Compliance: Designed for 2-wire 12V systems with a negative ground.
- Ensure proper alignment and secure attachment to avoid wiring faults.
Additional Information:
- Attention: This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.
Technical Support:
- For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
Warranty:
- Warranty Duration: [Insert warranty period]
- Coverage Details: [Insert coverage details]
- For complete warranty information, please download the full installation PDF.
Installation Instructions for 4-Way to 5-Way Adapter
Tools Required:
- Wire Crimpers
- Wire Cutters
- Test Light or Multimeter
- Quick Splice Connector (provided)
- Additional Wire (if needed for reverse light connection)
- Cable Ties (optional)
- Silicone Sealant (optional)
Overview:
This adapter converts your 4-way flat trailer connector to a 5-way flat, adding reverse light functionality for trailers with reverse lights or surge brake lockout systems.
Step-by-Step Instructions:
1. Mount the Adapter:
- Select a suitable mounting location near the hitch and securely install the adapter.
2. Connect the 4-Way Plug:
- Plug the 4-way flat connector from the adapter into the existing 4-way flat connector on your vehicle.
- This connection provides tail lights, left turn, right turn, and brake light functions.
3. Ground the Adapter:
- Locate a solid ground point near the adapter, such as the vehicle frame.
- Clean the surface to ensure proper contact.
- Secure the white ground wire from the adapter using the provided eyelet and a self-tapping screw.
4. Connect the Reverse Light Circuit:
-
Locate the Reverse Light Wire:
- Identify the reverse light circuit on your vehicle, typically found near the tail light assembly.
- Use the provided quick splice connector to attach the adapter's blue wire to the vehicle’s reverse light circuit.
-
Extend the Blue Wire (If Needed):
- If the adapter's blue wire is too short, splice in additional wire to reach the reverse light circuit.
- Route the wire safely, avoiding hot or moving parts, and secure it with cable ties.
-
Seal the Connection:
- If routing the wire through a grommet, seal any openings with silicone to prevent water ingress.
5. Secure the Wiring:
- Use cable ties to secure all wires and prevent them from hanging loosely or contacting sharp edges.
6. Test the Adapter:
- Plug the adapter into your trailer’s 5-way flat connector or use a test light to verify functionality:
- Brown Wire: Tail lights (solid when headlights are on).
- Yellow Wire: Left turn signal and brake light (flashes with turn signal).
- Green Wire: Right turn signal and brake light (flashes with turn signal).
- Blue Wire: Reverse light (active when the vehicle is in reverse).
- White Wire: Ground (continuity with the vehicle's ground).
Notes:
- This adapter is designed specifically for trailers requiring a reverse light or surge brake lockout circuit.
- Ensure all connections are secure to avoid intermittent functionality.
- Always follow safety guidelines during installation and verify all circuits before use.
Warning: Improper installation or overloaded circuits can result in damage or fire. Test all connections carefully.
Installation Instructions for 4-Way to 5-Way Adapter
Tools Required:
- Wire Crimpers
- Wire Cutters
- Test Light or Multimeter
- Quick Splice Connector (provided)
- Additional Wire (if needed for reverse light connection)
- Cable Ties (optional)
- Silicone Sealant (optional)
Overview:
This adapter converts your 4-way flat trailer connector to a 5-way flat, adding reverse light functionality for trailers with reverse lights or surge brake lockout systems.
Step-by-Step Instructions:
1. Mount the Adapter:
- Select a suitable mounting location near the hitch and securely install the adapter.
2. Connect the 4-Way Plug:
- Plug the 4-way flat connector from the adapter into the existing 4-way flat connector on your vehicle.
- This connection provides tail lights, left turn, right turn, and brake light functions.
3. Ground the Adapter:
- Locate a solid ground point near the adapter, such as the vehicle frame.
- Clean the surface to ensure proper contact.
- Secure the white ground wire from the adapter using the provided eyelet and a self-tapping screw.
4. Connect the Reverse Light Circuit:
-
Locate the Reverse Light Wire:
- Identify the reverse light circuit on your vehicle, typically found near the tail light assembly.
- Use the provided quick splice connector to attach the adapter's blue wire to the vehicle’s reverse light circuit.
-
Extend the Blue Wire (If Needed):
- If the adapter's blue wire is too short, splice in additional wire to reach the reverse light circuit.
- Route the wire safely, avoiding hot or moving parts, and secure it with cable ties.
-
Seal the Connection:
- If routing the wire through a grommet, seal any openings with silicone to prevent water ingress.
5. Secure the Wiring:
- Use cable ties to secure all wires and prevent them from hanging loosely or contacting sharp edges.
6. Test the Adapter:
- Plug the adapter into your trailer’s 5-way flat connector or use a test light to verify functionality:
- Brown Wire: Tail lights (solid when headlights are on).
- Yellow Wire: Left turn signal and brake light (flashes with turn signal).
- Green Wire: Right turn signal and brake light (flashes with turn signal).
- Blue Wire: Reverse light (active when the vehicle is in reverse).
- White Wire: Ground (continuity with the vehicle's ground).
Notes:
- This adapter is designed specifically for trailers requiring a reverse light or surge brake lockout circuit.
- Ensure all connections are secure to avoid intermittent functionality.
- Always follow safety guidelines during installation and verify all circuits before use.
Warning: Improper installation or overloaded circuits can result in damage or fire. Test all connections carefully.
Warranty Information:
For complete warranty instructions, please download the full installation PDF.
For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
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