Marine Wiring Harness Manufacturer
JinHai is dedicated to providing reliable, customized marine wiring harness solutions for demanding environments. With our advanced expertise, we deliver high-quality products to over 1,000 customers worldwide, including both individual and commercial clients.

Our Clients
Long-term exposure to humid, salt-fog, and vibration-prone environments poses significant challenges to equipment electrical management systems. JinHai delivers solutions that effortlessly withstand such conditions through superior product quality and exceptional manufacturing processes, ensuring reliable performance and safety.
Why Choose JinHai ?
Integrity and quality are the cornerstones of JinHai’s survival and development. We are committed to providing safe, reliable, and efficient solutions.
Customized Solutions
We are committed to providing prototyping services. Throughout the design process, we maintain close collaboration with you to ensure the prototypes meet your specific requirements.
Highly experienced
JinHai has been in the wire harness industry for over 20 years. With our robust technical design capabilities and professional expertise, we can easily handle all kinds of complex wire harnesses and provide you with reliable products.
Full support
From initial consultation to post-installation maintenance, our professional team is at your service throughout the entire process.
Quality Assurance
To ensure the long-term durability of wiring harnesses in marine environments, we consistently prioritize quality above all else. Each wiring harness undergoes rigorous testing to guarantee compliance with industry standards.
Our Manufacturing Capabilities
JinHai combines innovation with advanced technology to deliver reliable, high-performance solutions tailored to your specific requirements.
Customized Services
We provide comprehensive services tailored to the unique demands of marine environments:
- Custom wire harness design
- Prototype manufacturing
- Full-scale production and assembly
- Product testing
Design Process
You may mail us your old wiring harness, or we can visit your vessel to conduct on-site measurements. During this process, we will also perform a comprehensive assessment of electrical issues to ensure the manufactured harness perfectly matches your vessel’s electrical system.
Standard Certification
JinHai holds the industry’s highest certification standards, possessing ISO 9001 and IATF 16949 certifications.
Custom Content
We offer multiple customization options:
- Connector type (proprietary/universal)
- Cable length
- Cable color or custom identification
Security Testing
All products undergo rigorous testing to ensure compliance with industry standards and deliver optimal performance in real-world applications.
Prototyping
Before mass production, our prototyping services enable you to evaluate and refine your design while conducting real-world testing to ensure the product fully meets your expectations.
For Marine Wiring Harness
Please be advised that we currently supply certain marine wiring harness products.

Marine Trailer Wiring Harness
It features a waterproof male connector and multiple branches, suitable for trailers ranging from standard to high-end models. JinHai also provides customized solutions for ATV trailers, flatbed trailers, and other specialized trailer applications.

Engine Wiring Harness
These weatherproof engine wiring harnesses are ideal for installation in new vessels or retrofitting older ships. Constructed with multi-strand copper wire strands, they feature an outer layer of either steel wire braid or Kevlar tensile fibers, providing exceptional resistance to stretching and twisting. This ensures long-lasting durability and outstanding performance.
Featuring tin-plated copper terminals, stranded fine copper wires, and flexible insulation, it offers excellent corrosion resistance, abrasion resistance, and waterproofing. Widely used in automotive, lawn mowers, trucks, marine applications, battery pack wiring, solar systems, grounding cables, and more.
Quality and Safety, Guaranteed
Adhering to IPC/WHMA-A-620 standards, we ensure reliability and performance in each product.
What Our Customer Say
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Custom Wire Harness &
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Fast Turnaround Time
At JinHai, we ensure that custom wiring harness solutions are tailored to your needs, with quotations delivered within 12 hours to keep your projects on track.
Certified Quality Assurance
Our factory is ISO9001 and IATF16949 certified, guaranteeing the highest standards of quality, reliability, and compliance for all custom wiring harness and cable assembly services.
One-Stop Custom Solutions
We offer a complete, one-stop solution for all your wiring harness needs, from design to manufacturing, ensuring you get exactly what you need for your project.
How can we ensure proper protection of wiring harnesses during transportation?
Due to the harsh maritime environment during ocean shipping, where external humidity is extremely high and nighttime temperature fluctuations occur, moisture prevention is critical to maintaining low humidity inside shipping containers.
Moisture Prevention Measures: At JinHai, wire harnesses are packaged in cardboard boxes.
- Internal Moisture Protection: Two methods are employed—PE bags and aluminum foil bags (specific method determined by customer specification or provision)—with three desiccant packets per box for supplementary moisture control.
- External Moisture Protection: After final packaging, products are placed on pallets for shipment. Prior to dispatch, goods on pallets undergo secondary protection with stretch wrap.
What is the typical lead time for custom marine wiring harnesses?
Typically, our production process requires 2 to 6 weeks. However, the delivery cycle depends on the complexity of the circuit and the quantity required. Specific delivery schedules or methods will be negotiated based on actual circumstances.
For standard orders, JinHai will provide complimentary products equivalent to 0.1% of the order value for future maintenance or replacement purposes.
How to ensure the durability of marine wiring harnesses?
First, we exclusively use premium materials in our production. Second, considering the unique climatic conditions of marine environments, we conduct rigorous quality testing to ensure each wiring harness delivers optimal performance under humid, saltwater, and vibration conditions.
