A labour-intensive category that fits ASEAN perfectly
Wire harnesses resist automation. Crimping, routing, taping and continuity testing still depend on trained operators, which is why the category migrated to ASEAN early. Vietnam, Thailand and the Philippines now build harnesses for automotive, appliance, industrial machinery and medical equipment customers across the US, EU and Japan.
Where to build
| Country | Strength |
|---|---|
| Vietnam | Largest harness workforce, automotive and appliance |
| Thailand | Automotive tier-2, IATF 16949, industrial panels |
| Philippines | Electronics and medical cable assemblies |
| Malaysia | High-mix, low-volume industrial and semicon |
Specify to a recognised workmanship standard
Quote against IPC/WHMA-A-620 Class 2 (or Class 3 for medical and aerospace). Without it, "good crimp" is a matter of opinion. Your technical package should include:
- Wiring schematic and physical layout drawing with dimensions and tolerances
- Approved vendor list for connectors, terminals and wire, with part numbers
- Wire gauge, insulation type and temperature/voltage rating
- UL style numbers where UL recognition is required
- Labelling, heat shrink and over-mould requirements
- 100% continuity and hipot test requirement, with test voltage stated
Component sourcing is the real risk
Most harness problems trace to connectors, not labour. Decide early whether the factory buys components or you supply them. If the factory buys, require original-distributor traceability for branded connectors — grey-market TE, Molex and JST parts circulate widely and fail intermittently rather than obviously.
Tooling and equipment
Applicator tooling for each terminal type runs USD 800–3,000. Confirm the factory has the correct applicator for your terminal series and that crimp height is measured and recorded, not eyeballed. Ask for a crimp cross-section (micro-section) report at first article.
Testing evidence you should receive
- 100% continuity and insulation resistance test logs
- Hipot results where specified
- Pull-force testing on a sampled basis per AWG
- First article dimensional report against the layout drawing
MOQ and lead time
Harness MOQs are low compared to moulded products — 100–500 assemblies is normal, since the main setup cost is applicators and a test board. Lead time is typically 4–6 weeks after component lead times, and connectors often dominate the schedule.
How TUSKO manages harness programmes
We qualify the assembler, verify component traceability, hold the test board and applicator inventory question in writing, inspect in country, and deliver on one purchase order at a landed price. Our fee sits inside the order price — no retainer.
Frequently Asked Questions
What standard should I specify for wire harnesses?
IPC/WHMA-A-620 Class 2 for most commercial products, Class 3 for medical, aerospace and safety-critical applications.
Is UL recognition available from ASEAN harness makers?
Yes. Many Vietnamese and Thai assemblers hold UL file numbers. Ask for the file number and confirm the scope covers your construction.
Can I supply my own connectors?
Yes, and for controlled or allocated parts it is common. Agree scrap allowance and consignment handling in the purchase order.
What is a typical minimum order?
Often 100–500 assemblies, mainly limited by component minimums rather than labour.
Start a harness enquiry or see how our process works end to end.