At a Glance

> Plug Match: Verify the trailer uses a 7-way RV-style connection before ordering.
> Cord Length: Approximate 25-foot length is useful when routing from the plug area back to the trailer junction or wiring point.
> Circuit Check: Match each color-coded conductor to the trailer’s wiring layout before final connection.
> Ground Check: Confirm the white 10 AWG ground circuit is connected to a clean, reliable trailer ground point.
> Brake Circuit Check: Confirm the blue 12 AWG brake circuit is routed to the trailer’s electric brake system where applicable.
Brand: Need a Trailer Part
SKU: MP7WY-25-RP

Before You Order

Match the part number, measurements and connection points that apply to your trailer.

Connector	Match the connector and circuit count.
Function	Verify circuits rather than wire color alone.
Voltage	Confirm system voltage.

Product Details

Trailer Wiring / 7-Way RV Plug Harness

Pre-Assembled 7-Way RV Trailer Plug Wiring Harness – 25 ft

Pre-assembled trailer wiring harness with a 7-way RV-style plug and approximately 25-foot cord. Designed for replacing damaged or worn trailer cords on trailers using a standard 7-way RV-style wiring system.

Part Number: MP7WY-25-RP 7-Way RV-Style Plug Approx. 25 ft Cord

Overview

This R&P Carriages pre-assembled 7-way RV trailer plug wiring harness is built for trailer electrical service where a worn, damaged, or missing trailer cord needs replacement. The harness includes a single 7-way RV-style plug, approximately 25 feet of cord length, and color-coded multi-gauge conductors for common trailer lighting, brake, ground, reverse, and auxiliary power circuits.

R&P Service Insight

A trailer cord is one of the most exposed electrical components on a trailer. Damage from dragging, pinching, corrosion, or worn plug contacts can cause lighting issues, brake problems, or intermittent power faults.

Plug Match: Verify the trailer uses a 7-way RV-style connection before ordering.
Cord Length: Approximate 25-foot length is useful when routing from the plug area back to the trailer junction or wiring point.
Circuit Check: Match each color-coded conductor to the trailer’s wiring layout before final connection.

R&P Knowledge Hub

Compatibility: Commonly used on trailers equipped with a 7-way RV-style wiring system.

Vehicle / System Fit: Trailer electrical systems using a 7-way RV-style plug for lighting, brake, ground, reverse, and auxiliary power circuits.

Installation Notes: Verify plug configuration, cord length, wire gauge requirements, and trailer-side circuit assignments before installation.

Performance Insight: Color-coded, multi-gauge wiring helps organize the major trailer electrical functions and supports standard trailer service work when the wiring is connected correctly.

Brand & Fitment Note

Selling Brand: R&P Carriages

Application Reference: 7-way RV-style references in this listing describe the plug configuration and trailer wiring system style only.

What This Means: This listing is for a R&P Carriages trailer wiring harness, not a guaranteed OEM-branded item unless specifically stated and verified.

Before Ordering: Verify plug style, wiring layout, cord length, wire gauge needs, and included components before installation.

R&P Repair Insight

When replacing a trailer cord, do not rely on color alone if the trailer has been repaired or rewired before. Confirm each circuit at the trailer before tying in the new harness.

Ground Check: Confirm the white 10 AWG ground circuit is connected to a clean, reliable trailer ground point.
Brake Circuit Check: Confirm the blue 12 AWG brake circuit is routed to the trailer’s electric brake system where applicable.
Function Test: Test running lights, left turn/stop, right turn/stop, reverse, auxiliary power, ground, and brakes after installation.

Features

7-Way RV-Style Trailer Plug

Designed for trailers using a 7-way RV-style wiring connection.

Pre-Assembled Harness

Single-plug harness design helps simplify replacement of damaged or worn trailer cords.

Approx. 25 ft Cord Length

Provides approximately 25 feet of cord for routing into the trailer wiring system.

Color-Coded Multi-Gauge Conductors

Includes color-coded conductors with 10 AWG, 12 AWG, and 14 AWG wire functions listed below.

Specifications

Specification	Detail
Part Number	MP7WY-25-RP
Brand	R&P Carriages
Product Type	Pre-assembled trailer plug wiring harness
Connector Type	7-way RV-style plug
Cord Length	Approx. 25 ft
Wire Type	Multi-gauge, color-coded conductors
Application	Trailer wiring system replacement
Fitment	Trailers equipped with a compatible 7-way RV-style wiring system

Fitment / Application

Category	Details
Vehicle / System	Trailer electrical wiring system
Primary Fit	Trailers using a 7-way RV-style plug configuration
Replacement Use	Replacement for damaged, worn, or missing trailer cords where plug style, cord length, and wiring requirements match
Notes	Verify plug configuration, wire gauge requirements, cord length, and trailer-side wiring layout before installation.

Wire Color Codes

Wire Color	Function / Gauge
White	Ground – 10 AWG
Blue	Electric Brakes – 12 AWG
Black	Auxiliary 12V Power – 12 AWG
Yellow	Reverse – 14 AWG
Brown	Right Turn & Stop – 14 AWG
Red	Left Turn & Stop – 14 AWG
Green	Tail / Running Lights – 14 AWG

Included Components

Quantity	Item
1	Pre-assembled 7-way RV trailer plug wiring harness, approx. 25 ft

Verify plug configuration, wire gauge requirements, cord length, trailer wiring layout, and included components before installation. Wire color functions should be confirmed against the trailer’s actual wiring before final connection, especially on trailers that have been previously repaired or modified.

Search by Part Number

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Pre-Assembled 7-Way RV Trailer Plug Wiring Harness – 25 ft (MP7WY-25-RP)