MECMO 4-Pin Flat Trailer Extension Cable 48in (4ft) — 18AWG Copper, Weatherproof PU Jacket

MECMO's 48-inch 4-pin flat trailer extension cable is a ready-to-plug trailer wiring harness that extends your 4-way flat connector without splicing.

When you need extra reach between your vehicle and trailer or want a tidy, reversible connection for towing, this 4-foot MECMO extension gives you reliable continuity for tail, brake and turn signal circuits. Built with 18 AWG pure copper conductors, a resilient PU jacket and molded male/female ends, the cable is designed for common trailer types including boat, ATV, horse and utility trailers. It’s a simple add-on that avoids cutting factory wiring and keeps both vehicle-side and trailer-side plugs accessible.

How does this extension simplify trailer hookups?

The MECMO extension plugs directly into existing 4-way flat connectors for a no-splice, no-tools hookup. That makes connecting trailers faster and prevents permanent changes to vehicle or trailer wiring.

• Plug-and-play male and female 4-pin connectors
• 48-inch length provides extra reach and routing options
• Compatible with standard 4-way flat trailer systems
• Dust cover protects the female socket when not in use

Will this cable hold up to outdoor and marine conditions?

MECMO designed the cable with a heavy-duty PU outer sheath and reinforced joints to resist abrasion and moisture in typical outdoor towing environments. The female connector also includes a dust cap to reduce corrosion of the terminals.

• Weatherproof PU jacket for abrasion and UV resistance
• Reinforced cable joint where the cord meets the molded plug
• Dust cover shields terminals from dirt and moisture
• Suitable for boat trailer and outdoor use when used as intended

What vehicles and trailers are compatible with this 4-way extension?

This 4-pin flat extension fits the standard 4-way flat connector used on many passenger vehicles, light trucks and a wide range of trailers. It's particularly useful when factory cables are short or when mounting positions change after hitch installation.

• Fits boat trailers, ATV trailers, motorcycle trailers, horse trailers and utility trailers
• Works with vehicle- and trailer-side 4-pin flat connectors
• Great for temporary or permanent extension without altering factory wiring
• Straightforward solution for towing accessories and seasonal trailers

How durable and electrically sound is the wiring inside?

The harness uses 18 AWG pure copper conductors that balance flexibility with low resistance for lighting circuits. The molded grips make connecting and disconnecting easy while protecting the terminals and solder joints inside.

• Pure copper 18 AWG wires for consistent signal and light operation
• Molded male and female ends with ergonomic grips for secure handling
• Designed to carry standard tail, brake and turn signal loads
• Full-length shielding by the PU jacket protects wiring from wear

Who is this for: MECMO’s 48" 4-pin flat trailer extension is ideal for drivers and DIYers who tow trailers and need extra cable length without cutting factory harnesses. It suits boat owners, ATV riders, small haulers and anyone who wants a rugged, plug-in extension to simplify hookups and protect original wiring. If you need a quick, reversible wiring extension built for outdoor use, this cable provides a cost-effective, durable solution.