Buyer FAQ: MOQ, lead time, drawings, warranty
The questions that decide whether a harness order is worth placing, answered without sales language.
What is a full vehicle wiring harness?
A full vehicle wiring harness is the complete set of electrical looms in a vehicle — engine and ECU, body and cabin, dashboard, chassis and rear body — assembled as matched sub-assemblies that connect at defined splice points. A modern passenger car carries 1,500 to 3,000 circuits and, in high-specification vehicles, more than 3 miles (about 5 km) of wire.
Do you build harnesses for new-vehicle production or for the aftermarket?
Primarily the aftermarket and low-volume specialist production: distributors, independent workshops, fleet operators, body builders and converters. New-vehicle line supply requires OEM nomination, PPAP Level 3 and a program audit; we support that only for low-volume and specialist vehicle builders.
Can you manufacture from a sample with no drawing?
Yes, and it is most of what we do. We measure the sample, map every circuit and connector, identify the connector series and produce a drawing for your approval. The drawing becomes your document, so the part is repeatable and can be second-sourced later.
What is the minimum order quantity?
50 sets per part number for production. One unit is accepted as a paid sample so you can verify fitment before committing to a batch.
How fast can you quote?
24 hours for anything where you can supply an OEM part number, VIN or clear photos of the loom and its label. Two to three days if we need to reverse-engineer from a sample that has to reach us first.
What does a full harness set cost?
Typically USD 320–1,450 per set for a passenger car or light commercial vehicle, driven by circuit count, connector count and whether high-voltage sections are included. Pickups and chassis-cabs sit at the upper end; a simple supermini body loom sits at the lower end.
Do you supply genuine OEM parts?
No. We manufacture aftermarket replacement harnesses built to OEM fitment and circuit specification. We do not sell genuine OEM parts and we do not label our product with another manufacturer's brand.
Which connector brands do you use?
Sumitomo, Yazaki, Aptiv/Delphi, TE Connectivity, Molex, KET and JAE, in the original series wherever it is still available. Where a housing is obsolete we propose a documented equivalent and get your written approval before production.
How do you handle high-voltage EV harnesses?
Shielded 600 V and 800 V cable, orange jacket, HVIL interlock loop and IP67 connectors. Each assembly is hipot hipot tested at 3000 V AC with >200 MΩ insulation resistance at 1000 V DC. We do not build HV looms without a signed specification.
What warranty do you give?
24 months or 50,000 km against manufacturing defect — crimp failure, wrong circuit, insulation damage, connector defect. Installation damage, water ingress through a damaged grommet and customer modifications are excluded.
Can you ship samples by air and production by sea?
Yes. Samples and urgent fleet repairs go by express air. Production batches go by sea freight FOB, CIF or DDP. Looms are coiled and labeled per part number; volume orders can use returnable racks.
What documents come with a shipment?
Commercial invoice, packing list, HS code declaration, certificate of origin, per-unit electrical test record, and RoHS/REACH declarations on request. EU shipments include the material declaration required for customs.
Do you support private label?
Yes. We print your brand on the label, the carton and the drawing header, and we do not include our own branding. Private label requires a minimum of 200 sets per part number.
Can you supply one section instead of the whole loom?
Yes. Many repairs only need a hinge loop, an injector sub-loom or a door-grommet section. Section looms are cost less, ship faster and avoid disturbing circuits that are still healthy.
Is a wiring loom the same thing as a wire harness?
Yes. Both describe the same product: wires cut to length, terminated, bundled and protected for a defined routing. “Wire harness” or “wiring harness” is the usual term in North America; “wiring loom” or “cable loom” is the usual term in the UK, Ireland, Europe, Australia and much of Africa and the Middle East. Purchase orders often say “harness assembly”. A cable assembly is a narrower part, normally a single cable run with connectors at both ends.
What are the individual harnesses in a vehicle called?
They are named by the area they serve: engine harness (or engine room harness), main or body harness, floor harness, instrument panel or dash harness, door harness, chassis harness, rear body or tail harness, HVAC harness, ADAS or sensor harness, and the high-voltage harness on hybrid and electric vehicles. Naming varies between manufacturers, so we quote against the OEM part number rather than the name.
Can you supply a direct-fit replacement instead of a universal harness?
Yes, and we do not recommend universal looms for a repair. Every harness we build is vehicle-specific: correct branch lengths for the chassis code, the original connector series for each ECU, BCM and sensor, and the original circuit count. That is what makes it plug in without adapters, jumper wires or re-pinning.
Can you identify the harness if I only have the OEM part number or the VIN?
Usually yes. Send the OEM part number, the VIN, or a photo of the label on the old loom together with the chassis code and engine variant. We cross-reference the connector family and confirm the circuit list against the platform data we already hold for that vehicle, then send a drawing for your approval before production.
Do you build both left-hand drive and right-hand drive harnesses?
Yes. LHD and RHD vehicles route the dash, door and body looms differently, and some circuits change position with the steering side. Tell us the market and the steering side when you order, because a RHD dash harness will not fit a LHD vehicle even when the part number looks similar.
Still unresolved? Send the question with a photo of the loom label to johnny.zhao@oemloom.com or WhatsApp +86 138 8000 9663. Engineering replies, not a sales script.
Send the drawing. Get a quote and a sample date inside 24 hours.
Email a photo of the OEM label, a pin-out or the old loom itself. Our engineers will confirm fitment, circuit count and connector family, then send a quote and a sample date within 24 hours. Samples ship in 7–10 days; production takes 25–30 days.