Pre-terminated wire harness

We offer pre-terminated harnesses designed for tough situations and rapid use. These harnesses are made with top-quality materials and extra care.

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Product Introduction

A pre-terminated harness is not just a pile of wires. It is a carefully designed and built wire set. Skilled workers and machines work together to make it exact and safe. First, each colored wire is cut and stripped to the correct size. Then the ends, such as spade, blade, pin, or bullet, are pressed tightly with steady force so they will not come loose. These crimps are strong and reliable. The ends are also coated with tin or gold to stop rust and to last longer. For example, many female spade ends are made from tin-plated brass and tested to meet safety rules. After this, the wires are grouped into one neat and tidy bundle. Each color is chosen for meaning black for live, white for return, green for ground so workers can spot the right wire immediately without confusion.

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product intro Quick turn wire harness

Product Advantages

Product Advantages

Plug-and-Play Setup (Saves Time)

Our plug-and-play pre terminated harnesses make jobs super fast. Each wire is cut, ended, and labeled in the factory. All workers need to do is match plugs to the right parts. There is no wasted time cutting or stripping wires. Experts say these harnesses can “cut setup time in half.” They also save money because no tools like soldering irons or crimpers are needed. This cuts labor, reduces mistakes, and avoids delays, especially in big projects.

Strong and Reliable Joints

Our factory uses machines that always press similarly. This makes each crimp joint solid and long-lasting. These crimps hold firm against shakes, pulls, and heat. Open-barrel ends, which are used in cars and planes, add even more strength. While hand crimping can be uneven, our machine crimps are always safe and uniform. We use quality metals like tin-plated spades that meet strict safety standards. The result is a reliable harness that has existed for many years without extra care.

Custom and Flexible

Each harness can be made to fit your needs. You can choose the wire size, the type of cover, and the end style. We can add heat shrink or braided sleeves if you need extra protection. We can build short jumpers or long power lines. You can also choose connector brands like TE, Deutsch, Molex, or Binder. The layouts and pin counts can change, too. With our vast range of ends (AMP, JST, Deutsch, and more), we can build custom harnesses for almost any use. This means your harness will fit your box, sensor, or machine with no changes.

Material Recommendation

TE Connectivity Female Crimp Terminals

These female crimp terminals from TE Connectivity are simple, safe, and easy to use. They are often called FASTON female or socket terminals. They let you connect or remove wires very fast without needing extra tools. A widespread size is 0.250” (6.35mm). These parts are made from strong tin-plated brass, which does not rust easily. They are tested and certified for safety (UL/CSA). Small ones can carry about 7 amps of power, while bigger ones carry more. Some have nylon covers that protect against touch. Inline female terminals are also used in many harness jobs. They all give tight and steady joins, which keep the power flowing smoothly. Because of this, they are used in cars, machines, and home devices where safe and strong wiring is needed.

TE Connectivity Male Crimp Terminals

These are the matching male tabs for the female sockets. They are also called FASTON male connectors. They are made of tin-plated brass, which makes them last longer and stay safe from rust. The most used sizes are 0.250” (6.35mm) and 0.187” (4.75mm). One well-known type is the FASTIN-FASTON tab. Smaller 0.187” tabs are used when space is tight or the job is lighter. Some come with insulation covers for extra safety. TE makes both insulated and bare types in many wire sizes. They fit tightly into housings, so they will not loosen with movement or vibration. The closed-barrel crimp style grips wires all around, holding them firm and safe.

Male Open-Barrel Crimp Terminals (Pin Terminals)

These connectors are used when a firm wire hold is needed. They are shaped with small wings that fold around the bare wire and its cover. They are often used in cars, planes, and heavy machines because they do not loosen when things shake. They are usually made of copper alloys and coated with tin, nickel, or gold to make them strong and long-lasting. They come in different shapes, like round pins or flat tabs. Special crimp tools press them into neat “B” or “F” shaped crimps. These crimps make powerful bonds. They fit inside housings to form large, safe, and reliable multi-wire plugs.

Female Open-Barrel Crimp Terminals (Receptacle Terminals)

These connectors are made to join with male open-barrel pins. They are tin-plated copper alloy and grip wires very well. Small wings fold over the wire and its cover to lock it tightly. When placed inside housings, they snap onto the male pins and make a safe and firm join. These connectors do not loosen even in cars or machines that shake a lot. They are certified for safety and used in car ECUs, sensors, and other block plugs where many wires must join.

Female Spade Crimp Terminals (Tin-Plated)

Spade connectors are standard because they are quick to use. These TE FASTON parts can be plain or insulated. They are made of brass with a tin coat, which keeps them strong and stops rust. They come in 187 and 250 series, with small 2.8mm (0.110”) types for light jobs. They slide onto studs, fuse blades, or relay tabs with ease. They are often used for ground wires or power ends. The push-on style makes them very fast to connect or remove, saving time during repair or setup.

Female Blade Crimp Terminals (2.8 mm Series)

Small spade types for tight spots. They fit onto 0.110” male tabs. Even though they are small, they carry enough current for many jobs. Many come with insulation for added safety. They are used in LED lights, small harnesses, home appliances, and telecom devices. They meet global safety rules and are good where space is short, but a safe and strong connection is still needed.

Male Round Pin Crimp Terminals

These are also known as bullet connectors. They are round brass pins, often plated with tin or nickel for strength and rust resistance. The wire is crimped to the pin and then pushed into a matching socket. They come in many sizes, with 0.18” being common. They can be used in housings or as single connectors. They are widely used in lights and add-on parts. They make quick and safe joins and carry high currents. Many are sold in kits, and some have insulation covers. They are strong and last a long time when made from good materials.

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Solution

Our pre-terminated harnesses solve wiring problems in a straightforward step. They put many circuits into one neat bundle, so the wires are not messy. Each harness is built to match your needs: correct length, color, and connectors. Because cables are grouped, workers don’t waste time searching for wires or crimping one by one. The harness is a complete wiring solution for signal and power lines. Using these harnesses, builders finish jobs faster, avoid errors, and save time.

Red wires with metal ends

Red cables, like +12V or +24V, are used for power. We crimp each red wire with a strong end, such as a spade or bullet. These ends are coated to last long. Each crimp has a firm press and a color sleeve to show the size. This is very important for high-power lines. Even small spade tabs are made from tin-plated brass for extra safety.

White wires with plugs

White wires are usually for return or neutral. We add safe plugs or covers to keep them protected. For example, white PVC wires may have quick-connect plugs that fit tightly. These ready-made ends save time and stop mistakes. Each white wire is clearly marked so anyone can see what it is for.

Bright wires with metal ends

The bright and colorful cables make each line easy to see. Red is live, black is ground, white is neutral, and green is earth. Each end is crimped with a strong tip, such as a spade or a pin. Many tips are made from tin-plated brass that stop rust and wear. This ensures that no loose wire strands are left.

Giving neat, safe, and easy-to-use harnesses, we help save time, cut risks, and keep machines running smoothly. Our harnesses bring order, safety, and ease to wiring jobs, making them the wise choice for projects big or small.

Industries and Applications

Automotive & Transportation

Pre-made wire harnesses are used in cars, bikes, trucks, buses, and off-road vehicles. Makers order OEM pre-terminated harness kits because they save time and reduce mistakes. A harness for engines, lights, or sensors comes ready to use and tested. This saves hours of work and lowers risks. They are made to resist heat and vibration. Many are also labeled and color-coded for easy repairs later.

Industrial Machinery & Automation

In factories, machines use harnesses to connect motors, sensors, and controls. Industrial pre-terminated harnesses make wiring safe, neat, and fast. They can be built with quick-connect panels for easy repair. Some include shielded cables to block electrical noise, or armored covers for extra protection. Heavy-duty connectors like Deutsch or Binder are also used. This makes machines run with less downtime.

Control Panels & Electrical Systems

Control Panels & Electrical Systems

Panels for HVAC, PLCs, or switchgear use pre-made harnesses to speed up builds. Pre-terminated electrical harness kits are also used in lights, alarms, and sensors. They save time, look neat, and cost less. An LED system with a harness is faster to put in place and safer to service later.

LED Lighting & Renewable Energy

Pre-terminated harnesses for LED lights are standard in street lamps and building lights. They are often waterproof and sealed against dust and water. Solar panels and battery packs are also used for safe outdoor use. This makes the systems reliable for many years.

Telecom & Data Centers

Telecom racks and data centers need clean and fast wiring. Pre-made fiber and copper harnesses help set up panels quickly. Audio and video systems also use them to save time. The plug-and-play design makes upgrades and fixes faster.

Custom & OEM Work

Many clients trust us as Pre-terminated wire harness makers. We build harnesses to the exact size, wire type, and connector needed. Our harnesses are used in robots, medical devices, and boats. From small cable sets to complete kits, we give ready-to-use solutions.

Documentation & CAD Support for Design Integration

We provide complete design files so pre-terminated harnesses fit easily into your system. Our team makes 2D wire maps, pin charts, and harness layouts. We also give 3D CAD files (STEP/IGES) so engineers can place them in product models. Tools like Harnessware help us make these files fast. These tools have big part libraries and can make part lists, wire maps, and even test files. This support allows teams to save costs, avoid mistakes, and move from design to production faster.

Made for Your Project

Our pre-terminated harnesses can be used in many ways, whether your project is small, big, simple, or complex. You can choose the right connector, the correct number of pins, the wire size, and the length you need. If you need a jacket like PVC, Teflon, or rubber for safety and longer use, we can add that. We can wrap wires with braid or foil if you need to block outside noise or signals. If you want wires in transparent colors or with labels so you know where each one goes, we can make it that way.

Harness makers keep many types of cables in stock, from thin wires like 40 AWG used for signals to thick wires like 2 AWG used for heavy power. We use top brands like TE, Molex, Amphenol, and Deutsch to keep each harness strong and safe. This lets us make one design that can fit many products by changing the size or length. We can also add sleeves, shrink tubes, molded covers, clips, and ties to keep wires safe and in place. Whether you need one harness for testing or a large number for daily use, we can build and ship it fast.

Customized Pre-Terminated Harness Options

Pre-Crimped Jumper Wire Set - Male to Female / Female to Female

Crimped Wire Leads / One-End Crimped Terminal Wire Sets

Mixed-color single-ended pre-crimped wires

Bundled single-ended pre-crimped wires grouped by color

Bundled double-ended pre-crimped wires

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Pre-Made Harnesses with Exact Fit for OEM Use

Our pre-terminated harnesses are built to last and handle tough jobs. They are not just wires; they follow strict rules that OEMs trust. Each harness is built in plants that meet rules like IPC/WHMA-A-620, which gives step-by-step directions for harness work. To save time, we use Pro Design Tools. A tool called HarnWare can make plans and price quotes much faster than manual work. It ensures each detail matches your plan, like crimp size, wire length, and color. In real use, our harnesses give steady results that OEM systems need daily. They are used in cars, trucks, farm tools, machines, power plants, and control systems. Each harness is made to fit well and to last a long time.

Certified Quality in Pre-Made Harnesses

If you need pre-terminated harnesses, QL-Custom Technology Ltd. is a wise choice. We have many years of skill and a strong record of on-time work. Our team helps you from your first idea to the final test. We keep a big stock of wires and ends (AMP, JST, TE, etc.) so we can build your harness quickly, but still with care. Each harness is built to match your plan and checked individually. Each crimp and wire is tested before shipping. We focus only on harnesses, so our team has deep knowledge. You will always talk to someone who understands design and parts. In short, QL-Custom gives you safe, strong, and stress-free pre-terminated harnesses. Contact us today to get your harness made right the first time.

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Why Selecting QL-Custom Technology Ltd

If you need strong and safe overmolded wire harnesses, QL-Custom Technology Ltd. is a great company to choose from. We have our own tools and machines to make the overmolded wire harnesses from start to finish, and we check each one carefully before it leaves the factory. We have helped over 300 customers in many fields, such as car parts, medical equipment, and industrial machines. We can design the overmolded wire harness, make samples quickly, and produce large amounts of waterproof and protected harnesses. When you work with QL-Custom, you get products built for your exact needs and tested to work well in real life.

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Customer Reviews

"These harnesses saved me time when I used them. The wires and ends matched with no trouble. Each plug fits in fast and tight. I did not spend long hours fixing parts. It was ready to use right out of the box. I am glad with how strong and good these harnesses are."

David Mitchell

"The setup was easy for me. The harness came ready, neat, and simple to place. Every wire felt safe and strong. I thought I might find small problems, but there were none. It worked smoothly from start to end. I felt calm while using it."

Sarah Thompson

"This harness is good and well-made. Each plug locked in fast and smoothly, and it looked neat. I gave four stars, not five, only because the ship took longer. Still, the harness is strong and worth it."

Michael Rodriguez

"I have used many harnesses, but these are the best. They are clear, simple, and safe to use. I found no loose wires and no guesswork at any step. The pre-made style saved me time and gave me peace. All parts were the right size and set right."

Emily Carter

"These harnesses are great for fast jobs. The build is strong, and the look is good. They make the setup quick and simple. I plan to buy more for my next work, since they save time and give top results."

James Anderson

"The harnesses were so good to use. They delivered the exact product we needed. Also, the services were great. We are willing to work with them again."

Bill Denberg

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