CURT 57187 4-Way to 5-Way Flat Trailer Wiring Adapter for Boat Trailers
CURT 57187 4-Way to 5-Way Flat Trailer Wiring Adapter for Boat Trailers. This CURT 4-way trailer wiring connector provides the electrical link for lights and basic functions.
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CURT 57187 4-Way to 5-Way Flat Trailer Wiring Adapter for Boat Trailers. This CURT 4-way trailer wiring connector provides the electrical link for lights and basic functions. The 4-way flat carries four circuits: running lights, left turn, right turn, and ground — standard on utility and boat trailers without electric brakes. Replace at the first sign of intermittent connections or corroded pins — a failed connector means no trailer lights, which is both illegal and dangerous.
⚙️ Key Features
✅ 4-Way configuration
✅ CURT OEM quality
✅ Weather-resistant housing
✅ Color-coded wiring for correct installation
📐 Specifications
Configuration: 4-Way
Brand: CURT
AAA Part #: 57187
🔄 Cross Reference
CURT
🔧 Applications
7-way trailer connector provides the full electrical connection between tow vehicle and trailer: tail lights, left turn, right turn, electric brakes, 12V battery charge, backup lights, and ground. Standard on most trailers with electric brakes. The car-end plugs into the tow vehicle's factory 7-way socket; the trailer-end mounts on the trailer tongue. Replace when pins are corroded, bent, or connections are intermittent — connector failure is the most common cause of trailer light and brake problems.
📞 Call/Text: 517-225-1991 🌐 AAATrailer.com
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- Address: 4675 East Grand River Ave, Howell, MI 48843
- Phone: (517) 225-1991 (Call or text)
- Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment
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We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.
CURT 57187 4-Way to 5-Way Flat Trailer Wiring Adapter for Boat Trailers
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Regular price
$17.00
SAVE $-17.00
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CURT 57187 4-Way to 5-Way Flat Trailer Wiring Adapter for Boat Trailers
$17.00
Fast Shipping
In stock and ships in 1-2 business days
Pickup Available
Ready for pickup at our Grand Rapids location
Expert Support
Call us if you need help with fitment or installation
Easy Returns
30-day satisfaction guarantee on all parts
Ships in 1-2 business days
Pickup available in Grand Rapids
30-day satisfaction guarantee
