Custom Automotive Wire Harness Assembly Manufacturer

Reliable Automotive Wire Harness Solutions For Modern Vehicle Systems

Yihetai manufactures custom automotive wire harness assemblies for passenger vehicles, commercial vehicles, specialty vehicles, electric vehicles, off-road equipment and automotive electronic systems. For new energy vehicle projects, we also provide custom EV wire harness assemblies based on voltage, current, connector and routing requirements.

From simple connector-to-connector assemblies to complex multi-branch vehicle harnesses, we provide complete design support, wire processing, terminal crimping, connector assembly, overmolding and electrical testing services. Our manufacturing processes comply with ISO9001 and IATF16949 quality management requirements.

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Automotive Wire Harness Design Is More Than Connecting Wires

Automotive wiring is not only about connecting one wire to another. A vehicle harness must work reliably under vibration, movement, temperature change, moisture, dust and mechanical stress.

During design review, Yihetai helps customers confirm connector matching, terminal selection, wire gauge, branch length, sleeve protection, fuse or relay requirement, sealing method, label marking and final testing requirement.

Design FactorWhy It Matters
Connector MatchingEnsures correct mating with vehicle-side devices
Terminal CrimpingAffects electrical contact and long-term reliability
Wire GaugeMust match current load and voltage drop requirement
Branch LengthHelps the harness fit the actual vehicle routing path
Routing SpaceHarness must fit inside vehicle panels or equipment layout
Protection SleeveHelps resist abrasion, vibration and mechanical damage
Sealed ConnectorUsed for moisture, dust or outdoor exposure
Fuse / Relay DesignSupports power protection and accessory control
LabelsHelps installation, maintenance and production traceability
Electrical TestingConfirms continuity, pinout, polarity and short/open status

This is why automotive wire harnesses should be designed according to the real vehicle application, not only by connector appearance.

Automotive Wire Harness Types We Manufacture

Yihetai can manufacture different automotive wire harnesses and cable assemblies according to customer drawings, samples and application requirements.

  • Automotive Lighting Harness
  • Fog Light Wire Harness
  • LED Light Bar Harness
  • Sensor Wire Harness
  • Camera Cable Harness
  • Fuse and Relay Harness
  • Switch Panel Harness
  • Battery Cable Assembly
  • Ground Cable Harness
  • Sealed Connector Harness
  • Control Module Harness
  • Aftermarket Accessory Harness

Automotive Connectors, Terminals & Sealing Options

Connector and terminal selection is one of the most important parts of automotive wire harness design. A wrong connector, loose terminal or unsuitable seal may cause poor contact, water ingress, unstable power supply or field failure.

Yihetai can help review connector type, terminal style, wire size and sealing structure according to your application.

ComponentAvailable Options
Connector TypeSealed connector, wire-to-wire connector, board connector, automotive-style connector or customer-specified connector
Terminal TypeCrimp terminal, ring terminal, spade terminal, bullet terminal, blade terminal or custom terminal
Sealing OptionRubber seal, waterproof connector, heat shrink, grommet or rubber boot
Connector LockingLocking clip, latch, secondary lock or customer-specified locking structure
Terminal MaterialCopper, brass, tin-plated copper or project-specific material
Wire EndOpen wire, tinned wire, crimp terminal, connector or custom termination
MountingClip, clamp, bracket, panel pass-through or custom fixing method
IdentificationCable label, circuit label, color marking, barcode label or part number label


Before production, we recommend confirming the mating connector, terminal size, wire gauge and sealing requirement using a drawing, sample or connector datasheet.

Vehicle Environment & Harness Protection Design

Automotive wire harnesses may be installed in different vehicle areas. Each area has different risks such as heat, vibration, water splash, dust, oil, abrasion or limited routing space.

Vehicle EnvironmentHarness Design Focus
Engine BayHeat, oil, vibration and protective sleeve
Exterior Lighting AreaWaterproof connectors, UV resistance and abrasion protection
Interior CabinCompact routing, labels and clean appearance
Dashboard / Control PanelSwitch wiring, labels and connector matching
Chassis / UnderbodyMoisture, dust, abrasion and cable fixation
Camera / Sensor AreaSignal stability, waterproof sealing and routing space
Battery AreaWire gauge, current load, fuse protection and grounding
Aftermarket InstallationEasy installation, connector matching and wiring identification
Door / Tailgate AreaFlexibility, bending and anti-abrasion protection
Off-Road / Heavy-Duty UseRugged sleeve, sealed connector and vibration resistance

Harness protection options may include corrugated conduit, braided sleeve, PVC tape, fabric tape, heat shrink tube, grommet, rubber boot, cable tie, clip or custom fixing method.

Fuse, Relay & Power Distribution Options

Many automotive harness projects require fuse or relay structures to support safe power distribution and accessory control. Yihetai can customize fuse relay harnesses according to current load, circuit function and installation method.

OptionPurpose
Inline Fuse HolderAdds overcurrent protection to accessory wiring
Blade Fuse HolderCommon for low-voltage vehicle wiring
Waterproof Fuse HolderUsed for outdoor or moisture-exposed wiring
Relay Socket HarnessUsed for lighting, horn, fan or accessory control
Switch HarnessUsed for dashboard or control panel operation
Battery Ring TerminalUsed for power input or grounding
Ground WireSupports stable electrical connection
Splitter BranchDistributes power to multiple devices
Protective LabelIdentifies voltage, fuse rating or circuit function
Heat Shrink ProtectionAdds insulation and strain relief

Fuse rating, relay type and wire gauge should be confirmed according to customer drawings, load current and application requirement.

Automotive Signal, Camera & Sensor Harness Design

Automotive harnesses are not only used for power. Many vehicle systems also require signal, camera or sensor wiring. These applications may require shielding, stable routing, waterproof connector matching and correct pinout.

Harness Function Design Focus
Camera Cable Harness Video signal, connector matching, shielding and routing
Parking Sensor Harness Sensor channel identification and waterproof connector
Temperature Sensor Harness Cable material and signal stability
Pressure Sensor Harness Reliable pinout and sealed connection
Control Signal Harness Pinout accuracy and label marking
CAN / LIN Related Wiring Twisted pair, shielding if required and stable routing
Dashboard Signal Cable Compact wiring, switch connection and labels
Vehicle Display Cable Signal stability and connector matching

For sensor and signal harnesses, please provide the pinout, connector datasheet or existing sample before quotation. For camera, sensor, CAN/LIN and other signal circuits, Yihetai can also provide custom EMI shielded cable assemblies to help improve signal stability in vehicle electronic systems.

Cable Protection, Sleeve & Labeling Options

Protection and identification are very important for automotive harness installation. A harness may need abrasion protection, organized routing, circuit labels or barcode traceability.

Protection / Marking OptionPurpose
Corrugated ConduitMechanical protection and cable routing support
Braided SleeveAbrasion protection and clean appearance
PVC Tape WrappingHarness bundling and flexible routing
Fabric TapeNoise reduction and interior harness protection
Heat Shrink TubeInsulation, strain relief and marking
GrommetPanel pass-through protection
Rubber BootConnector or terminal area protection
Cable Tie / ClipFixes harness routing position
Circuit LabelHelps installation and maintenance
Barcode LabelSupports production traceability

Yihetai can customize protection and labeling according to your assembly process and vehicle installation requirement.

Key Features of Our Custom Automotive Wire Harnesses

  1. Custom automotive connectors, sealed connectors and wire-to-wire connectors
  2. Ring terminals, spade terminals, bullet terminals, blade terminals and crimp terminals
  3. Automotive lighting harness, sensor harness, camera harness, fuse relay harness and accessory harness options
  4. Custom wire gauge, cable length, branch structure and circuit function
  5. Corrugated conduit, braided sleeve, PVC tape, fabric tape, heat shrink and grommet protection
  6. Inline fuse holder, blade fuse holder, relay socket and switch harness design
  7. Waterproof sealing, rubber boot, connector lock and strain relief options
  8. Custom labels, wire color, barcode label and packaging
  9. Prototype samples and mass production supported
  10. Continuity, pinout, polarity, short/open and visual inspection before shipment

Typical Applications Of Our Automotive Wire Harnesses

Custom automotive wire harness cable assemblies connect lighting, sensors, switches, control modules, battery cables, and vehicle electronics. Yihetai also provides custom battery cable assembly, custom OBD cable assembly, and custom motorcycle wiring harness solutions for related automotive applications.

Automotive Lighting Systems

Custom harnesses for headlights, fog lights, LED light bars, tail lights and auxiliary lamps.

Rear-View Camera Systems

Camera cable harnesses for vehicle cameras, DVR systems, monitors and display modules.

Vehicle Sensors

Sensor wire harnesses for parking sensors, temperature sensors, pressure sensors and monitoring devices.

Dashboard & Switch Panels

Switch panel harnesses for control panels, dashboard switches and aftermarket accessories.

Fuse & Relay Wiring

Fuse relay harnesses for power protection, lighting control and accessory circuits.

Aftermarket Accessories

Custom wiring for vehicle modification, add-on devices, off-road equipment and aftermarket products.

Battery & Ground Cables

Power and ground cable assemblies for low-voltage vehicle electrical systems.

Control Modules & Vehicle Electronics

Custom harnesses for control boxes, electronic modules, displays and vehicle-mounted devices.

Manufacturing Capability

As a trusted wiring harness factory and cable assembly manufacturer, Yihetai uses automated cutting, crimping, and assembly lines for high-volume automotive wire harness production. Our 5,000 sqm facility handles 100,000+ units monthly, from prototypes to OEM runs, with full traceability via ERP systems.

From material selection to final assembly and testing, all processes follow IATF 16949 standards for zero defects. Typical lead time for prototypes is 5-7 days, mass production 3-4 weeks ensuring on time delivery for your custom wiring solution.

Testing setup for automotive wire harness electrical integrity.

Quality Assurance & Control

Yihetai implements full-process quality control with documented systems from incoming inspection to final outgoing audit, traceability via ERP, and zero-defect goals for every custom wire harness. We hold ISO 9001:2015, UL, and IATF 16949 certifications, ensuring automotive-grade compliance for global OEMs.

Quality inspection items include:

  • Incoming material inspection
  • Wire specification and insulation check
  • Terminal crimp height and width inspection
  • Terminal crimp pull force test
  • Connector position and wire sequence check
  • Visual and continuity check
  • Short circuit and open circuit test
  • High-voltage test
  • Insulation resistance test

Why Choose Yihetai

25+ years of custom wire harness expertise serving automotive, industrial, renewable energy, medical, lighting, and smart automation industries worldwide

Strong engineering support for custom design, drawing review, BOM analysis, and connector matching, helping customers optimize manufacturability and find suitable alternatives

OEM and ODM wire harness manufacturing support from prototype development and small-batch production to high-volume custom cable assembly projects

In-house wire processing and assembly capability covering cutting, stripping, crimping, soldering, bundling, injection molding, and testing under one quality system

100% electrical testing and full traceability for every wire harness, including continuity, wire sequence, insulation, and high-voltage reliability testing before shipment

Competitive pricing and flexible lead times from a China-based wire harness factory, helping customers reduce sourcing costs while maintaining reliable quality and fast response

Frequently Asked Questions

Yes. Yihetai can manufacture custom Automotive wire harness products according to your 2D drawings, 3D installation layout, electrical schematic, BOM list, connector part numbers or physical samples. If your design is still under development, our engineering team can also help review wire gauge, connector selection, terminal type, protection method and assembly process to improve manufacturability.

For a fast quotation, please send wire gauge, cable length, connector model, terminal type, circuit diagram, quantity, material requirement, voltage/current rating, working temperature and any special requirements such as waterproofing, shielding, labeling or protective sleeves. If you do not have complete technical files, you can send samples or application photos, and we will help evaluate the custom wiring solution.

Yes. Yihetai supports prototype samples, small-batch trial orders and mass production for automotive wire harness and custom cable assembly projects. Prototype lead time is usually around 5-7 days after technical confirmation and material availability. For mass production, delivery time is normally 3-4 weeks depending on quantity, material sourcing and product complexity.

We can work with many automotive connector types, including TE, Molex, JST, Deutsch-style, Sumitomo-style, Yazaki-style, waterproof plugs, sealed connectors, board connectors, ring terminals, Faston terminals and other customer-specified connector systems. If your original connector is hard to source, our engineering team can help check compatible alternatives based on electrical and mechanical requirements.

Yihetai controls quality from incoming materials to final shipment. We inspect wire, terminals and connectors, control cutting and stripping dimensions, check terminal crimping quality, perform pull tests, verify connector assembly, and conduct 100% electrical testing before delivery. Depending on the project, we can also perform insulation resistance, high-voltage, dimensional and fixture inspections to ensure stable batch quality.

Example Custom Automotive Wire Harness Projects

Every automotive wiring project has different connector, routing, protection and testing requirements. Below are some typical custom automotive wire harness projects that Yihetai can support according to customer drawings, samples or application requirements.

Case 1: Automotive Lighting Harness

Customer Requirement

The customer needed a custom wire harness for vehicle lamps and interior atmosphere lighting. The harness had to match the lamp connector, fit the vehicle installation space and support stable power connection during assembly.

Yihetai Solution

Yihetai reviewed the customer’s sample and wiring requirement, then customized the harness structure according to the lighting module layout.

Our support included:

  • Custom wire length and branch layout
  • Connector matching for vehicle lamps
  • Correct polarity design
  • Terminal crimping control
  • Cable labeling for assembly identification
  • Continuity and polarity testing before shipment

Result

The finished harness was suitable for vehicle lighting module assembly and batch production, helping the customer improve installation efficiency and reduce wiring mistakes.

Case 2: Battery Sampling Harnes

Customer Requirement

The customer needed a battery sampling harness with accurate wire sequence, stable connection and clear channel identification. Each sampling wire had to be easy to identify during installation.

Yihetai Solution

Yihetai customized the multi-wire harness according to the customer’s wiring diagram and channel definition.

Our support included:

  • Multi-wire harness assembly
  • Custom labels for sampling channels
  • Connector cavity verification
  • Wire sequence checking
  • Electrical continuity testing
  • Final appearance inspection

Result

The harness helped improve installation accuracy and made each sampling channel easier to identify during assembly and maintenance.

Case 3: Gear Controller Wire Harness

Customer Requirement

The customer needed a gear controller wire harness for vehicle control applications. The harness required stable signal transmission, reliable terminal connection and protection against vehicle vibration.

Yihetai Solution

Yihetai reviewed the connector, terminal and routing requirements, then built the harness according to the customer’s control system layout.

Our support included:

  • Automotive connector selection
  • Secure terminal crimping
  • Pull force inspection when required
  • Anti-vibration routing design
  • Bundling and sleeve protection
  • Pinout and continuity testing before shipment

Result

The finished harness provided a stable connection for vehicle control applications and supported reliable assembly in the customer’s system.

Looking for a reliable Automotive wire harness manufacturer?

Send us your drawing, sample or technical requirements, and Yihetai will provide a customized wire harness or cable assembly solution for your project. Our team can support prototype development, connector matching, technical evaluation, cost optimization and fast quotation.

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Custom Wire Harness & Cable Assembly Manufacturer

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