Automotive Wiring Harness Custom Manufacturing | High-Quality Harness Solution

The main differences between GB standard (GB/T 5023) and US standard (UL 758/AWM): ① Nominal cross-section — GB uses mm² (such as 0.5/0.75/1.0mm²), while US standard uses AWG (such as 22/20/18AWG); ② Test methods — GB focuses on conductor resistance and insulation resistance, while US standard focuses on mechanical properties (bending/tensile/impact); ③ Certification markings — US standard wire harnesses must be printed with UL/AWM number, while GB standard wire harnesses are printed with CCC certification number; ④ Customer groups — export to the US/Canada requires UL certification, and domestic sales require CCC certification. Yingna Technology wire harnesses meet both GB and US standards, and UL certification numbers are traceable.

Yingna Technology provides wire harness terminal processing services and supports multiple terminal types: pre-insulated terminals (O-type/U-type/tube-type), bare terminals (OT/SC/GT), flag terminals, closed-end terminals, spade terminals, etc. Terminal crimping uses fully automatic crimping machines, and the crimp tensile strength complies with UL 486A. Customer-supplied materials (wire + terminals) processing or designated brand and model terminals are both acceptable. After terminal crimping, adding heat-shrink tubing or insulating sleeves can further improve insulation performance and mechanical strength.

Yingna Technology wire harness products have a standard warranty of 2 years. During the warranty period, free repair or replacement is provided for damage not caused by human factors. Domestic customers receive 48-hour response and repair completion within 7 working days; overseas customers can arrange repair by DHL/FedEx. Products beyond the warranty period are provided paid repair services (cost approximately 30~50% of a new product). Lifetime technical support is provided, including wire harness selection consultation, terminal processing solutions, and quality problem diagnosis. Annual framework agreement customers enjoy value-added services such as priority production scheduling, free samples, and factory inspection support.

3 methods to quickly identify wire harness quality: ① Visual inspection — the insulation surface is smooth with no marks, no bubbles, and no color difference or eccentricity; ② Bending test — after repeated bending 100 times, the insulation has no cracks (silicone rubber) and no obvious whitening (PVC); ③ Flame test — for high-quality wire harnesses, self-extinguishing time after removal from flame is ≤30 seconds (UL VW-1/FT2 standard); inferior wire harnesses continue burning with drippings. Also measure insulation thickness (whether it meets UL standard) and conductor resistance (≤ UL specified maximum). Before bulk purchasing, it is recommended to require the supplier to provide samples for comprehensive quality confirmation.

The flame retardant rating of this wire harness reaches UL VW-1 (vertical burn test), which is the minimum flame retardant requirement of the UL 758 electronic wire standard. Higher flame retardant ratings are optional: UL VW-1 + vertical burn, UL FT2 (horizontal burn), UL VW-1 + FT2 dual certification. Significance of flame retardant standards: For a wire harness that passes VW-1, in the vertical burn test, after 5 times of 15-second burning, the flame self-extinguishes within 60 seconds, does not ignite the cotton cloth below, and has no burning drips. For applications with high fire protection requirements (such as inside new energy vehicle battery packs and medical devices), it is recommended to select a wire harness with a higher flame retardant rating.

Any color can be customized; usually provide a Pantone color number or color swatch for color matching. Common stock colors: black, white, red, blue, yellow, green (shipped within 24~48 hours). Custom color MOQ depends on specifications (usually from 1000 meters), lead time extended by 3~5 working days. Printing/marking service: model, LOGO, certification mark, etc. can be printed on the wire harness surface as required; both heat transfer printing and inkjet coding processes are supported. Please provide a printing draft before confirming the printing content to avoid errors.

The insulation material of this harness uses silicone rubber (Silicone Rubber) or PVC, with the corresponding material selected according to different model specifications. Silicone rubber withstands temperatures from -60℃ to 200℃; PVC withstands temperatures from -20℃ to 105℃. The entire series of wires complies with RoHS 10-item testing and REACH SVHC screening, contains no lead, mercury, cadmium, or other harmful substances, and third-party SGS test reports can be provided. Electronic wires exported to North America must meet the UL VW-1/FT2 flame retardant rating; those exported to Europe must meet the CE Low Voltage Directive.

This product uses stranded tinned copper wire conductors, balancing conductivity and corrosion resistance. Bare copper conductivity is approximately 101%IACS, and tinned copper is approximately 98%IACS (difference only about 3%). Advantages of tinning: oxidation resistance is 3~5 times stronger, solderability is better (avoiding solder non-wetting issues), and corrosion resistance is significantly improved. For scenarios requiring high reliability such as new energy vehicles and outdoor equipment, it is recommended to prioritize tinned copper wire harnesses.

New energy vehicle (EV/HEV) wire harnesses must meet higher standards: ① Temperature resistance grade — the internal temperature of the battery pack can reach 85~150℃, so silicone rubber wire harnesses must be selected (PVC cannot meet the requirement); ② Voltage resistance grade — high-voltage connection wire harnesses withstand 600V~1000V, far higher than ordinary 300V; ③ EMC shielding — high-voltage wire harnesses require an added braided shielding layer to prevent electromagnetic interference (EMC, compliant with CISPR 25 standard); ④ Flame retardant requirements — VW-1 + low smoke zero halogen (LSZH); ⑤ Vibration resistance — terminal crimping must not loosen under high-frequency vibration environments (vehicle operation); ⑥ TS16949 automotive quality management system certification. Ordinary wire harnesses do not meet the above requirements and are prohibited for use on new energy vehicles.

The minimum bending radius of this wire harness is 5 times the wire diameter, far smaller than the 10 times wire diameter requirement for ordinary PVC wire. Due to the stranded structure of multiple extra-fine tinned copper wires, the harness offers excellent flexibility and can be routed flexibly in confined spaces such as mobile phones, sensors, automotive door panels, and LED luminaires, and repeated bending is unlikely to break the core. If a smaller bending radius is required (such as robot drag chains), a high-flexibility drag-chain-specific wire harness can be selected.

This wire harness has passed UL (United States) and CE (European Union) certification and complies with RoHS environmental protection and REACH regulatory requirements. The UL certification number is traceable, and CE declaration documents are complete. For bulk purchases, the following can also be provided: UL certification copy, material certificate (MDS), SGS environmental test report, and product flame retardant test report. For customers with special certification requirements (such as VDE, CCC, PSE, KC, etc.), please inform us in advance, and certification applications can be arranged separately.

The insulation layer of this machine's wiring harness itself is water-resistant (both silicone rubber/PVC do not absorb water), but for outdoor exposed use, it is recommended to combine the following solutions to enhance waterproofing: ① Use IP67/IP68 waterproof connectors; ② Add waterproof heat-shrink tubing (with hot melt adhesive) at the crimp; ③ Cover the cable with a PVC or PE protective sleeve to enhance mechanical protection; ④ Use potting compound (epoxy resin or polyurethane) at the connection to achieve permanent waterproofing. Combined with the above solutions, long-term underwater connection (10 meters water depth) can be achieved, suitable for scenarios such as LED underwater lights, sewage treatment equipment, and marine wiring harnesses.