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Quality Products
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Some manual wiring required
Warranty: One-Year Limited Warranty
Installation Time Exact (Minutes): 0
There are several different types of connectors used to supply power from a tow vehicle's electrical system to a trailer's wiring system. Some trailers only need the bare essentials -- running lights, brake lights and turn signals -- while others require a connection for reverse lights, electric brakes and auxiliary power. With connectors ranging from simple to complex, it may be the case that the connection between your vehicle and your trailer is not a perfect match. For example, your truck may be equipped with a 6-way round socket, but your trailer may have a 4-way flat plug. For this very common problem, CURT offers a quick and simple solution in the form of an electrical adapter. An adapter is an electrical device that allows a connection to be made between a mismatched trailer plug and vehicle socket. It easily plugs in your vehicle's electrical socket and usually requires no additional wiring. CURT offers an array of adapters to accommodate most types of plugs and sockets, including 4-way flat, 4-way round, 5-way flat, 6-way round, 7-way RV blades and more. This special dual-output electrical adapter is actually designed to adapt a 4-way flat vehicle socket to fit multiple trailer plugs, including a 4-way flat and a 7-way RV blade connector. Some manual wiring is required. This multipurpose socket also comes with an integrated electrical tester, dust covers, a mounting bracket and all necessary mounting hardware for a complete installation. All CURT wiring and electrical products come with a one-year limited warranty to give you the assurance you need to tow with confidence.
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 888-634-9494Rediscover "Us" Time | Tested. Proven. Safe. Towing Products
The 4-way flat electrical adapter converts a vehicle's 4-way flat trailer connector to a different connector type: either a 6-way round, 7-way RV blade, or dual 4-way flat output. This allows you to connect trailers with different connector types to your vehicle. The adapter harness carries tail lights, stop lights, turn signals, auxiliary/backup lights, and electric brake signals.
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.
The adapter is available in single-output versions (converting to either 6-way round or 7-way RV blade) and dual-output versions (providing both a 4-way flat and either a 6-way round or 7-way RV blade). Part numbers 57184 and 57183 do not include a mounting bracket; all others do. Choose based on the connector type(s) your trailer requires.
Both part numbers 57674 and 57102 are dual-output adapters converting from 4-way flat to dual 4-way flat and 7-way RV blade outputs, and both include a mounting bracket. The manual does not specify any functional differences between these part numbers.
You will need: a 1/8" drill bit, a drill, a Phillips screwdriver, a wire stripper, a cutting tool, terminal crimpers, and a test light. The manual also lists three self-tapping screws (#10 - 1/2") as required, though these are noted as not included.
No. Three self-tapping screws (#10 - 1/2") are required but not included with the product. You will need to obtain these separately.
You must use 12 gauge (minimum) wire with butt connectors to connect the remaining wires to the appropriate functions. Using undersized wire could cause overheating and fire.
Mount the combination harness on the tow vehicle's bumper or other suitable surface. The connectors must be positioned in an area that is within reach of the trailer's wiring harness and near the center of the vehicle. If a mounting bracket is included, use it as a template for drilling.
No. Never attach the mounting bracket directly to the hitch by cutting, welding, or drilling into the hitch. Attach it to the vehicle's bumper or other suitable surface instead.
Drill 1/8" holes. You will drill holes for the mounting bracket (using the bracket as a template) and one 1/8" hole for the ground connection at a suitable grounding point on the vehicle.
Before drilling, be sure of what is behind the surface you are drilling into. Check for brake lines, fuel lines, wiring, or any other components that may harm the vehicle's operation. The manual warns to stay clear of these items and to check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Yellow = Auxiliary or backup lights; Blue = Electric brakes; Black = Positive power (+) with appropriate inline fuse; White = Ground (-). The white wire must be connected to a grounding point on the vehicle using a #10 - 1/2" self-tapping screw.
Locate a suitable grounding point within reach of the combination harness on the vehicle. Ensure the area is clean of dirt, debris, and undercoating. Drill a 1/8" hole and attach the white wire (with ring terminal) to this hole using a #10 - 1/2" self-tapping screw. This ground connection is required for the harness to work properly.
Proper grounding is required for the harness to work properly. The white wire on the vehicle's 4-way flat connector will not support the ground (-) functions of the combination harness's 4-way flat and 6- or 7-way connector. Failing to properly ground the product can cause loss of warranty, overheating, and potential fire.
Yes. The black wire carries positive power (+) and must be connected with an appropriate inline fuse. The manual does not specify the fuse amperage rating.
Using 12 gauge (minimum) wire and butt connectors, connect each wire to its corresponding function: Yellow to auxiliary or backup lights, Blue to electric brakes, Black to positive power with an appropriate inline fuse, and White to a grounding point. After all connections are made, secure any loose wires using cable ties or equivalent.
Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower. Additionally, failing to properly ground the product can cause loss of warranty, overheating, and potential fire.
Confirm proper function with a test light or by using a properly functioning trailer. This will verify that all connections are working correctly before using the adapter with your trailer.
The 57674 fits any vehicle with a 4-way flat trailer connector. It converts to dual 4-way flat and 7-way RV blade outputs and includes a mounting bracket.
You need a 1/8" drill bit, drill, Phillips screwdriver, wire stripper, cutting tool, terminal crimpers, and test light. You must also obtain three #10 - 1/2" self-tapping screws (not included) and 12 gauge minimum wire with butt connectors.
Yes. You must drill 1/8" holes for the mounting bracket and a 1/8" hole for the ground connection. Before drilling, check for brake lines, fuel lines, and wiring behind the surface.
Use 12 gauge (minimum) wire with an appropriate inline fuse. The manual does not specify the fuse amperage; consult the manufacturer for the correct rating.
Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower. Proper grounding is also critical; failing to ground the product can cause loss of warranty, overheating, and fire.
No. Never attach the mounting bracket directly to the hitch by cutting, welding, or drilling. Attach it to the vehicle's bumper or other suitable surface.
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Authorized Dealer| Part # | From Vehicle | To Trailer | Notes | Material |
|---|---|---|---|---|
| Single Output | ||||
| 57184 | 4-way flat | 7-way RV blade | See mounting brackets on pages 127 and 128 | Plastic |
| 57183 | 4-way flat | 6-way round | See mounting brackets on pages 127 and 128 | Die-cast |
| 57185 | 4-way flat | 7-way RV blade | Includes mounting bracket | Steel |
| 57186 | 4-way flat | 7-way RV blade | Includes wiring and components to splice in a brake controller connection | Plastic |
| 57506 | 4-way flat | 7-way RV blade | Ideal for towing a boat trailer with surge brakes | Plastic |
| 57626 | 4-way flat | 6-way round | Integrated test lamps display proper connections | Plastic |
| 57676 | 4-way flat | 7-way RV blade | Integrated test lamps display proper connections | Plastic |
| 56476 | 4-way flat | USCAR socket | Pair with #57015 for 4-way and 7-way RV blade output. See page 112 | Plastic |
| Dual Output | ||||
| 57604 | 4-way flat | 4-way flat | -- | Plastic |
| 57624 | 4-way flat | 6-way round | Integrated test lamps display proper connections | Plastic |
| 57627 | 4-way flat | 6-way round | -- | Plastic |
| 57674 | 4-way flat | 7-way RV blade | Integrated test lamps display proper connections | Plastic |
| 57102 | 4-way flat | 7-way RV blade | Audible back-up alarm when vehicle in reverse (97 decibels) | Plastic |
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