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Custom Heavy Duty 7 Way Trailer Cable New Electrical Coiled ABS Wire Spring Towing Wire Parts & Accessories for Trailers

The Trailer Tow Wiring Harness, commonly known as a trailer towing electrical cable or tow line, is an essential electrical accessory used to connect the lighting and signaling systems of a trailer, caravan, or semi-trailer to the towing vehicle (e.g., truck, SUV, van). It ensures safe and synchronized operation of brake lights, turn signals, tail lights, reverse lights, and auxiliary power between the towing vehicle and the trailer.

This wiring harness typically features a standardized plug-and-socket connector system (such as 4-pin, 5-pin, 6-pin, or 7-pin) that allows for quick and reliable connection. The cables are made from flexible, weather-resistant, and abrasion-proof materials to withstand harsh outdoor conditions, including moisture, dust, vibration, and temperature fluctuations.
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  • Trailer Parts

Attribute Description
Product Name Trailer Tow Wiring Harness / Towing Electrical Cable
Common Names Tow Line, Trailer Light Connector, Trailer Wiring Kit, Towing Harness
Application Connecting trailer lighting system to towing vehicle
Connector Type 4-Pin, 5-Pin, 6-Pin, 7-Pin (Blade or Round), ISO 1724, SAE J560 (heavy-duty)
Standard Compliance ISO 11446, ISO 1724, SAE J560, ECE R121, DOT, CE
Cable Material Copper conductors with PVC or rubber insulation
Jacket Material Flexible PVC, Rubber, or TPE (Thermoplastic Elastomer)
Protection Grade IP67 (dustproof and waterproof when connected)
Operating Temperature -40°C to +85°C (-40°F to +185°F)
Cable Length 3m, 5m, 8m, 10m (custom lengths available)
Color Coding Standardized per ISO (e.g., Brown = Tail Light, Green = Right Turn, etc.)
Installation Type Plug-and-play, hardwired, or universal adapter kits
Reusability Yes – durable for multiple trailers and vehicles
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Parameter Specification
Model Number TW-7P-ISO11446
Connector Standard ISO 11446 (7-pin flat)
Voltage Rating 12V / 24V DC
Current Capacity 20A max per circuit (brake light), 10A for others
Wire Gauge 16 AWG (1.5 mm²) – standard; 14 AWG (2.5 mm²) for heavy loads
Insulation Resistance ≥ 50 MΩ
Dielectric Withstanding 500 V AC, 1 min (no breakdown)
Connector Shell Material UV-resistant ABS plastic or nylon
Contact Material Brass, tin-plated or copper alloy
Cable Outer Diameter Approx. 8–12 mm
Bend Radius (Min) 5x cable diameter
Life Cycle (Plug/Unplug) ≥ 10,000 cycles
Approvals E-marked, CE, RoHS compliant


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