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CURT
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Always the correct part
We know our products
Quality Products
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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 6-way round connector. Some manual wiring is required. This multipurpose socket also comes with 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 other trailer connector types: 6-way round, 7-way RV blade, or dual 4-way flat outputs. This allows you to connect trailers with different connector styles to your vehicle.
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.
Single output models convert to either 6-way round or 7-way RV blade. Dual output models provide both a 4-way flat output and either a 6-way round or 7-way RV blade output simultaneously. Part numbers 57184 and 57183 are single output without mounting brackets; 57185, 57626, and 57676 are single output with mounting brackets; 57604, 57624, 57672, 57674, and 57102 are dual output with mounting brackets.
No. Part numbers 57184 and 57183 do not include mounting brackets. All other part numbers (57185, 57626, 57676, 57604, 57624, 57672, 57674, 57102) include mounting brackets.
Required tools are: 1/8" drill bit, drill, Phillips screwdriver, wire stripper, cutting tool, terminal crimpers, and test light. Three #10 - 1/2" self-tapping screws are also needed (not included in the kit).
No. Three #10 - 1/2" self-tapping screws are required but not included. You will need to obtain these separately.
The mounting bracket should be attached to the vehicle's bumper or other suitable surface. The connectors must be mounted in an area that is within reach of the trailer's wiring harness and positioned near the center of the vehicle.
Before drilling, check for miscellaneous items that may be hidden behind or under any surface. Stay clear of brake lines, fuel lines, wiring or any other components that may harm the vehicle's operation. Ensure the area is clean of dirt, debris or undercoating.
Drill 1/8" holes into the mounting surface. Use the bracket as a template to mark the hole locations. The holes accommodate #10 - 1/2" self-tapping screws.
No. Never attach the mounting bracket directly to the hitch by cutting, welding or drilling into the hitch. The bracket must be mounted to the vehicle's bumper or other suitable surface.
Yellow = Auxiliary or back-up lights; Blue = Electric brakes; Black = Positive power (+) with appropriate inline fuse; White = Ground connection (required for proper operation).
Using 12 gauge (minimum) wire and butt-connectors, connect the remaining wires to the appropriate functions: yellow to auxiliary or back-up lights, blue to electric brakes, and black to positive power with an appropriate inline fuse. The white ground wire must be attached separately to a grounding point on the vehicle frame.
12 gauge (minimum) wire is required for connecting the adapter wires to the appropriate vehicle functions.
Locate a suitable grounding point within reach of the combination harness on the vehicle frame. Ensure the area is clean of dirt, debris or undercoating. Drill a 1/8" hole and attach the white wire with the ring terminal 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 (positive power) must be connected with an appropriate inline fuse.
Feed the entire harness through the large mounting hole in the bracket and position the connector against the face of the mounting bracket. Using the supplied mounting hardware, attach the connector to the bracket.
Slide the 4-way flat connector into the side mounting slot until the connector is secured in place.
Plug the combination harness's trailer-style 4-way flat connector into the tow vehicle's 4-way flat connector. This connection provides the tail lights, stop lights and turn signal functions.
Confirm proper function with a test light or by using a properly functioning trailer. This verifies that all connections are working correctly.
Secure any loose wires by using cable ties or equivalent product.
Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower.
Yes. You must drill two 1/8" holes: one for the mounting bracket fasteners and one for the ground wire attachment. Check for brake lines, fuel lines and wiring before drilling.
Use 12 gauge (minimum) wire and butt-connectors to connect the adapter wires to vehicle functions.
Failing to properly ground the product can cause loss of warranty, overheating and potential fire. Grounding is required for the harness to work properly.
| 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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