Door Wiring Harnesses for Manufacturers: A Complete Guide

For companies needing high-volume door wiring harnesses, choosing the right supplier is key to ensuring quality and timely production. Well-designed harnesses improve electrical performance in the automotive and aerospace industries.

In the following guide, we’ll discuss what to look for when buying door wiring harnesses, focusing on quality, reliability, and delivery speed.

What Is a Door Wiring Harness?

A door wiring harness is an electrical system that transmits power and signals between door locks, windows, audio, and lighting. 

The main parts include: 

• Wires:  Connects different components using durable materials such as vinyl or rubber
• Terminal connectors: Connects wiring harnesses and wires
• Protective sleeves: Protects the wire from any damage
• Interface connectors: Connects the automobiles’ main wiring harness to the door wiring harness.

The design may vary across different automotives, but all harnesses need to be:

• Oil resistant and waterproof enough to withstand both low and high temperatures to suit the car’s operating environment; 
• Reliably powers audio, lighting, door locks, window controls, and other functions.

The harness is crucial to the automobile’s electrical system, supporting smooth function, safety, and convenience. Therefore, adhering to relevant requirements and standards during production is important.

Benefits of Door Wiring Harnesses

You can enjoy the benefits of a door wiring harness by taking advantage of the following:

 “Plug-in” installations

During production, the door wiring harness is tailored to the specific design of the door. Factors like convenience and maintainability are also considered when manufacturing the wiring harness to ensure accurate installation and smooth operation. This makes vehicle manufacturing faster and more efficient, as you can install the entire harness instead of connecting each wire individually.

Higher quality and Safer 

Since the wires and cables are grouped together in an assembly, they are protected from moisture, abrasion, and vibrations. Additionally, this setup maximizes space efficiency. The risk of electrical shorts is also minimized as the wires are bundled together in a flame-retardant sleeve.

How to Choose the Best Door Wiring Harness

Here are some things to consider when choosing door wiring harnesses for cars or trucks.

OEM vs. Aftermarket Parts

When choosing the components, you have two options. 

• OEM parts are especially made for a particular vehicle, ensuring a perfect fit and compatibility. They have extended lead times, making it difficult to get accessible stock. In addition, OEM parts are generally more expensive, which tends to increase the cost of production.
• On the other hand, aftermarket parts are built to OEM specifications or higher. They are equally reliable but with faster delivery and lower prices, making them an appealing option for car manufacturers who would like to lower production time without sacrificing quality.

Manufacturer Reputation

A reliable manufacturer maintains strict quality standards and consistently delivers dependable products. But how do you evaluate manufacturers to ensure a successful door wiring harness?

• A company’s client list often reflects its strong reputation. For example, Wiringo’s work with GE, Honda, and Honeywell highlights our proven reliability.
• Look for ISO 9001 and IATF 16949 certifications. ISO 9001 specifies quality standards for a company to improve the procedures and processes, while IATF 16949 is for automotive quality. 
• Testing is important to ensure the quality of the harness. Reliable manufacturers like Wiringo perform 100% online testing and IEC spotting tests to verify every product.
• Using a proven supplier ensures reliable, timely parts, reducing risks and delays in your manufacturing process.

Ease of Installation

When selecting a door wiring harness, efficiency and cost-oriented manufacturers greatly appreciate the ease of installation. Wiringo offers plug-and-play harnesses with no additional wire cutting and terminal crimping. The pre-assembled parts can be easily integrated into your system. By conserving the time for adjustments, car manufacturers streamline their assembly operation.

Service and Support

Excellent service and support are necessary for car manufacturers to ensure smooth operations and avoid expensive mistakes.  Buying from manufacturers that can provide essential support, including:

• What are their delivery lead times? No matter how high-quality your products are, they are useless if they do not reach the customers on time. Get assurance from the contract manufacturer about the delivery times.
• Can you purchase on terms? Check whether the manufacturer agrees to purchase on terms so that you can pay the invoice 30 days after the invoice. If you offer more business to the manufacturer, you can ask them to follow your terms and conditions. 
• Does the manufacturer accept blanket orders? In such orders, you can order 1000 pieces, and the wire harness manufacturer will ship 250 pieces per month, and you have to pay for the shipped quantity only. With such terms, you are sure of getting 1000 pieces, but you get time to release the money more slowly. Also, with high orders, manufacturers become willing to offer you lower prices than usual.
• Do the manufacturers produce buffer quantities? In buffer quantities, people place an order for some amount but take less than that and keep the rest as a buffer for immediate release when required. When your buffer stock is depleted, the manufacturer resumes production.
• Do the manufacturers pay for shipping? When evaluating manufacturers, always ask about the free shipping threshold. Free shipping and product discounts can lead to significant savings. Don’t miss the opportunity to cut costs.

Additional Capabilities

When buying wiring harnesses for your car’s door, choosing a supplier capable of delivering your desired products within the given timeframe is better. 

• Ensure the wiring harness manufacturer can cut wires and cables as desired, crimp, solder, or terminate the wires, and follow specification sheets. 
• Assess the manufacturer’s quality processes and quality control measures. 
• See if they have enough storage capacity, employees, and access to power supply for high production requirements.
• Guarantee they can buy parts tailored to your unique makes, letting you avoid the inconvenience of the wrong size. 

Wiringo Gives You Peace of Mind

Whether expanding your car production or optimizing existing supply chains, Wiringo offers one-on-one service and flexible wiring harness solutions.

With over a decade of experience in custom harness manufacturing, our expert team ensures every part fits perfectly, arrives on time, and exceeds quality expectations. You’ll also receive expert support and fast resolution for any issues.

Contact us today for a quote – we will get back to you within one business day.