Product type

Trailer Harness

Overview

Trailer harnesses connect towing vehicles with trailer lighting, brake, ABS/EBS, auxiliary equipment and exposed chassis circuits.

Ask About This Product Type Find Models & Material Part Numbers Back to Products

Trailer trucks operating in rainy road conditions

Popular Product Photos

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01
4-Pin Flat Plug Color-Coded Wire Trailer Light Harness

02
7-Pin Trailer Plug to Multiple Lighting Terminal Harness

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Explorer Trailer 3-Port Corrugated-Conduit Harness

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58909 KL Trailer Multi-Plug Braided Sleeve Harness

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7-Pin Circular Trailer Plug with Junction Box Harness

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4-Pin Trailer Light Dual Y-Branch Harness

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4-Pin Flat Trailer Light T-Branch Short Harness

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4-Pin Trailer Plug with Ground Ring Terminal Long-Lead Harness

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4-Pin Trailer Light Long-Lead Multi-Branch Corrugated-Conduit Harness

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13-Pin Circular Plug Coiled Trailer Harness

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4-Pin Flat Trailer Plug Color-Coded Extension Harness Set

12
7-Pin Trailer Plug to Dual Lighting Connector Branch Harness

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4-Pin to 5-Pin Trailer Light Short-Branch Harness

14
AS2668 13-Pin Dual Circular Plugs Coiled Trailer Harness

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13-Pin Circular Straight Plug Coiled Trailer Harness

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7-Pin & 4-Pin Trailer to USCAR Branch Harness

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55384 USCAR to 7-Pin & 4-Pin Trailer Harness

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57672 7-Pin to 4-Pin Trailer & Terminal Harness

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Trailer Brake Controller 4-Wire Plug Pigtail51431

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Trailer Brake Controller 4-Wire Plug Short Pigtail

PART NUMBER / INTERFACE / MATERIAL

Models, Part Numbers & Sourcing

Find a cable model or material part number, then send it for a custom replacement or original-part sourcing review.

Cable & Harness Models

Manufacturer-identified finished assemblies for this application.

Painless Performance
30121
Universal Trailer 4 Flat Pigtail
Custom compatible replacements · Original-parts sourcing

Selection & Project Review

01 Application Boundary

A trailer harness is not one universal cable. Connector family, regional interface, system voltage, circuit count, trailer length, axle and brake architecture, installed equipment and exposure determine the released design. A plug that mates mechanically does not prove pin assignment, current capacity, grounding, network compatibility or environmental performance.

02 Project Inputs

Provide towing vehicle and trailer type; market and applicable interface standard; system voltage; connector and mating-part data; circuit table and loads; lighting, brake, ABS/EBS and auxiliary equipment; trailer length, axle count and articulation points; chassis route photographs; clips and pass-throughs; water, salt, mud, UV and washdown exposure; drawings or sample; labels; quantity; and required validation.

03 Release Records

Approved requirements become controlled drawings, circuit and pin tables, BOMs, cut lists, splice maps, route datums, protection instructions, labels and test programs. First articles are checked for mating, reach, articulation, chassis clearance, lamp and equipment function and agreed vehicle behavior before repeat production. Records remain linked to trailer configuration and drawing revision.

04 Interface Review

Confirm the exact mating interface, pin map, dimensions and installation orientation.

05 Sample Acceptance

Agree the sample configuration and electrical, mechanical or environmental checks required by the project.

06 Change Control

Record changes to materials, drawings and process instructions before repeat manufacture.

Send the part number, drawing or sample to confirm the replacement configuration and sourcing plan.