Cable Assembly
Every tested harness leaves with a defined pass/fail record: continuity, polarity, hipot, insulation resistance, crimp pull-force, and IPC/WHMA-A-620 workmanship checks matched to your drawing instead of generic sampling.
Application Context
Wire harness testing service buyers usually have one concern: they need proof that the harness will not stop their production line after receiving inspection. WHP already builds custom assemblies under ISO 9001:2015 and IATF 16949:2016 quality systems, with 100% electrical testing referenced across our factory wiring harness and custom cable assembly processes.
The important difference is scope. A simple continuity test proves every conductor reaches the expected pin. It does not prove insulation margin, crimp strength, connector latch engagement, seal integrity, or functional behavior under load. We define the test matrix from the harness drawing so each risk gets the right verification method.
Our best fit is production-bound custom harness work: prototypes heading into NPI, OEM cable programs, sealed assemblies, automotive harnesses, medical device cable sets, battery cables, and multi-branch industrial harnesses. We are not a standalone certification lab and we do not issue safety approval for finished equipment.
Test Methods
Each method answers a different failure question. The correct test plan depends on voltage, connector style, environment, harness complexity, and customer documentation requirements.
Every circuit is checked against the approved net list so opens, shorts, swapped pins, and missing conductors are caught before shipment. This is the baseline test for every custom wire harness testing service order, not a sample-only inspection.
High-voltage harnesses, sealed assemblies, and safety-critical programs can add hipot testing to verify insulation integrity between conductors or conductor-to-shield paths. Test voltage and dwell time are set from your drawing or control plan.
Insulation resistance testing identifies moisture intrusion, jacket damage, contamination, and marginal separation before a harness reaches the customer line. We typically use this test for waterproof, medical, and high-voltage cable assemblies.
Electrical continuity alone does not prove a terminal crimp will survive vibration, heat, and service handling. We combine periodic crimp-height inspection with pull-force checks based on terminal, wire gauge, and workmanship class.
Trained inspectors check connector seating, terminal lock engagement, wire dress, branch breakout, heat-shrink coverage, label accuracy, and jacket damage. Visual inspection catches assembly defects that automated electrical tests cannot see.
When a harness interfaces with sensors, relays, control boxes, or battery modules, we can build a customer-specific fixture that checks more than continuity. Fixture scope is defined during drawing review so the quote reflects the actual test burden.
Test Risk
A drawing that says "100% test" without defined pins, voltage, dwell time, resistance limits, and record format leaves the factory and customer measuring different things. We lock every acceptance limit before the lot begins.
Continuity alone proves a conductor reaches its pin, not that the terminal crimp survives vibration and heat. Crimp-height audits and pull-force checks catch weak terminations before shipment.
Sealed, high-voltage, and moisture-exposed assemblies can pass continuity yet fail on insulation margin. Hipot and insulation-resistance tests find those paths before the harness reaches the line.
Regulated and OEM programs need records tied to part number, revision, date code, and fixture. We define the documentation package at RFQ so the quote reflects the real test burden.
Technical Capabilities
These specifications are drawn from existing WHP wire harness production capabilities and are used to define the quotation boundary.
Manufacturing Process
Quality & Testing
Every completed harness is tested against the approved setup, failed units are isolated and retested under controlled rework, and finished lots ship with the agreed record package — from a lot-level test summary to unit-level pass/fail data for regulated programs.
Why WHP
Testing built into the production process, not bolted on as a separate lab step.
Lot-level and unit-level test records available when the program specifies them — test summary, certificate of conformance, inspection checklist, and crimp-audit data.
Custom assemblies built under ISO 9001:2015 and IATF 16949:2016 quality systems across the factory network.
Test criteria, pass/fail limits, and fixture scope are reviewed before the quote so undefined requirements never surface mid-production.
Testing supports prototypes, pilot lots, and recurring OEM releases — from 1-piece validation builds to 100K+ monthly programs.
We build and inspect to IPC/WHMA-A-620 workmanship under ISO 9001 and IATF 16949 quality systems, with the exact class set from your program.
FAQ
OEM Program Entry
Send your drawing, pinout table, BOM, target quantity, and required documentation. We will review test coverage, fixture needs, risk points, and return a quote for tested wire harness production.
Related Capabilities
Testing is most effective when it is connected to the build process, documentation package, and production release plan.
Where Testing Pays Off
Testing intensity should match the cost of failure. A desk accessory and an EV battery harness should not use the same inspection plan.
If a harness has fewer than 10 circuits, low voltage, and non-critical use, continuity and visual inspection may be enough. If the harness carries safety-related power, uses sealed connectors, includes more than 40 circuits, or ships into automotive, medical, robotics, or outdoor equipment, add insulation resistance, selected hipot, crimp audits, and formal records.
On Test Planning
"The expensive testing mistake is not under-testing or over-testing. It is undefined testing. If the drawing says '100% test' but does not define pins, voltage, dwell time, resistance limit, and record format, the factory and customer are not measuring the same thing."
Hommer Zhao
Founder & Technical Director, WHP
References
We avoid linking to standards storefronts that block crawlers. These stable references explain the organizations and concepts behind the test plan language.