| 1. Application Definition |
Operating voltage, current, temperature, vibration, moisture exposure, installation space, flexing requirements, and expected service life. |
Electrical load, environmental conditions, routing limitations, and mechanical movement must be defined before selecting materials. |
Engineering review against the equipment specification, drawings, and applicable regulatory requirements. |
Reduces redesign risk and helps ensure that the harness is suitable for its actual operating environment. |
| 2. Electrical Design |
Wire gauge, conductor type, insulation material, circuit identification, branch layout, connector family, terminals, seals, and protective coverings. |
Wire size and insulation rating are selected according to current capacity, voltage, temperature, voltage drop, and installation conditions. |
Design-rule checks, bill-of-material review, schematic comparison, and engineering approval. |
Creates a repeatable design package that can be reviewed and manufactured across different production locations. |
| 3. Mechanical Design |
Overall length, branch lengths, breakout locations, bend radius, clip positions, conduits, braided sleeving, tapes, grommets, and strain relief. |
Dimensions and routing features must match the available installation space and avoid excessive tension, abrasion, heat, or sharp bends. |
Full-scale fixtures, dimensional inspection, digital drawings, and fit checks on the target assembly. |
Improves installation consistency and minimizes assembly time at the buyer’s facility. |
| 4. Documentation Package |
2D drawings, wiring diagrams, connector details, bill of materials, wire-processing specifications, test requirements, and revision history. |
Each revision should identify wire colors, circuit numbers, terminal locations, component quantities, and applicable tolerances. |
Document-control review and comparison between the approved design and the production traveler. |
Supports clear communication, quotation accuracy, traceability, and controlled change management. |
| 5. Material Selection |
Wires, terminals, connectors, seals, sleeves, protective tubing, labels, clips, fuses, and other approved components. |
Materials are selected for electrical performance, temperature range, chemical exposure, mechanical stress, and compatibility with mating parts. |
Incoming inspection, supplier certificates where required, part-number verification, and sample testing. |
Helps maintain consistent quality and reduces the risk of incompatible or substituted components. |
| 6. Wire Cutting and Stripping |
Automatic or semi-automatic cutting to length, insulation stripping, marking, and preparation for terminal application. |
Cut length, strip length, conductor exposure, insulation damage, and circuit identification must remain within the approved specification. |
First-piece approval, calibrated measuring tools, visual inspection, and periodic in-process checks. |
Improves dimensional consistency and supports stable downstream crimping and assembly. |
| 7. Terminal Crimping |
Application of open-barrel or closed-barrel terminals using approved tooling and controlled machine settings. |
Important crimp characteristics include crimp height, conductor brush, insulation support, bell mouth, terminal position, and pull-out strength. |
Crimp-height measurement, cross-section analysis when required, visual inspection, and destructive pull testing. |
Reliable crimps reduce contact resistance, intermittent faults, and field-service failures. |
| 8. Connector and Component Assembly |
Terminal insertion, connector locking, secondary-lock engagement, seal installation, splicing, clips, labels, and protective components. |
Correct cavity position, terminal retention, connector orientation, seal placement, and locking status are essential. |
Work instructions, go/no-go gauges, visual checks, terminal-retention checks, and connector fit verification. |
Ensures that the finished harness can be installed and mated correctly without rework. |
| 9. Harness Routing and Taping |
Placement on assembly boards or fixtures, branching, wrapping, sleeving, conduit installation, and attachment of clamps or clips. |
Branch position, wrapping coverage, bend radius, protective spacing, and attachment locations must follow the approved drawing. |
Fixture-based dimensional inspection and comparison with the master sample or assembly board. |
Provides repeatable shape and routing for efficient installation in global production environments. |
| 10. Continuity and Short-Circuit Testing |
Electrical verification of circuit-to-circuit connectivity, open circuits, short circuits, and incorrect terminal positions. |
Every circuit should correspond to the approved wiring diagram and connector cavity assignment. |
Computerized harness tester, point-to-point continuity testing, and programmed fault detection. |
Detects wiring errors before shipment and is commonly applied as a production end-of-line check. |
| 11. Dielectric Withstand and Insulation Testing |
High-potential testing where required, together with insulation-resistance checks between circuits or between circuits and shielding. |
Test voltage, duration, insulation-resistance limit, and acceptance criteria are defined by the product specification and applicable standard. |
Calibrated electrical safety tester using an approved test program. |
Helps confirm electrical separation and supports safety requirements for the target application. |
| 12. Mechanical and Dimensional Inspection |
Overall length, branch locations, connector orientation, terminal position, clip location, labels, protective coverage, and visible workmanship. |
Inspection limits are based on the approved drawing, tolerance scheme, and applicable workmanship requirements. |
Inspection fixtures, gauges, measuring tools, visual standards, and first-article inspection records. |
Improves interchangeability and reduces installation problems at overseas assembly sites. |
| 13. Quality Standards and Workmanship |
Controlled processes for crimping, soldering where applicable, wire preparation, connector assembly, inspection, and defect classification. |
IPC/WHMA-A-620 is widely used as a workmanship reference for cable and wire harness assemblies; the required class and acceptance criteria must be specified by the buyer. |
Operator training records, process audits, visual standards, inspection reports, and corrective-action procedures. |
Creates a common technical language between international buyers, engineers, and manufacturing teams. |
| 14. Traceability and Change Control |
Lot identification, material records, operator or station records, test results, drawing revisions, and nonconformance history. |
Traceability depth depends on the application, contractual requirements, and risk level of the harness. |
Serial or batch records, inspection logs, controlled document systems, and audit reviews. |
Facilitates root-cause analysis, controlled updates, warranty investigation, and regulatory documentation. |
| 15. Packaging and Export Readiness |
Protective wrapping, connector caps, separation of branches, moisture protection, carton labeling, packing lists, and shipping documentation. |
Packaging must prevent connector damage, deformation, contamination, tangling, and moisture exposure during international transportation. |
Final packaging inspection, quantity verification, label review, and shipment-document check. |
Reduces transit damage and makes receiving and inventory handling easier for global buyers. |
| 16. Buyer-Side Supplier Evaluation |
Technical capability, tooling control, test coverage, production capacity, quality system, communication process, and supply continuity. |
Evaluation should focus on documented capability rather than price alone, including sample approval and production-process evidence. |
Technical audits, sample validation, capability reviews, quality agreements, and pilot-production assessment. |
Supports stable sourcing, clearer risk management, and consistent supply for international programs. |
