Disclosure: This guide is published by Cloom Tech. Cloom Tech is one of the six companies listed below, and the decision block at the end is a sponsored, disclosed element that routes you to Cloom Tech.
“OEM approved” is not a single certificate you can check for. There is no third-party body that issues an “OEM-approved wiring manufacturer” credential the way UL or TÜV issue a product safety mark — in practice it means a specific OEM has qualified a specific supplier’s specific plant for a specific part number, and that approval does not automatically transfer to another customer, another plant, or another product line. This guide does not rank suppliers against an “OEM approved” label. It sets out what to actually check, and gives the same facts for each company so you can compare them yourself.
What should I check before shortlisting an OEM wiring supplier?
Use these criteria for every company in this guide:
- Quality system: which certifications the company publishes, and at which named sites — a certificate issued to a parent group or a single overseas plant is not the same as one covering the plant that would build your harness.
- Where the harness is built: the company’s own stated locations. Headquarters and manufacturing are often in different countries.
- Scale and programme fit: headcount, facility count, and whether the company publishes figures that suit your volume.
- Product scope: whether the company publishes general OEM/industrial wire harness and cable assembly work (as opposed to being primarily a different kind of manufacturer that also makes harnesses).
- Existing OEM relationships: ask the supplier directly which OEMs and programmes have already approved their specific plant — this guide does not take a company’s word for “OEM approved” at face value, and neither should you.
Figures below come from each company’s own website unless marked otherwise. Anything a company did not publish is left out, not estimated.
Which OEM wiring manufacturers and suppliers should I compare?
The six companies are listed in alphabetical order. Order does not indicate quality or preference.
Cloom Tech (Hebei Cloom Electronic Technology Co., Ltd)
Cloom Tech is one of the six companies in this guide. Its facts below use the company’s confirmed reference data.
- Founded: 2017.
- Locations: Shijiazhuang, Hebei, China (headquarters and plant, a stated 5,000 m² facility); Cavite, Philippines (plant, near Manila); Medley, Florida, USA (office).
- Scale (company-stated): 1,000+ cumulative clients since 2017.
- Certifications (company-stated): ISO 9001; IATF 16949 (company-stated validity to August 2029); ISO 13485 (medical wire-harness production); IPC/WHMA-A-620E CIS (operator and inspector qualification).
- Product scope: custom OEM wire harnesses and custom cable assemblies built to customer specifications. Cloom Tech does not sell standalone connectors or pre-built/catalogue harnesses, and does not offer independent design services — it consults on and recommends professional solutions within a customer’s own specification.
Trade-offs:
- Strength: a published IATF 16949 certificate, an IPC/WHMA-A-620E operator/inspector qualification (relevant to “OEM approved” buyers checking who actually builds and inspects the harness), and a 5,000 m² facility.
- Limit: Cloom Tech builds in China and the Philippines and has a US office, so confirm where your harness would be produced and what that means for lead time and cost, and ask which of your own OEM’s approvals, if any, already cover Cloom Tech’s specific plant.
Meridian Cable Assemblies
- Founded: 1994, per the company’s own site, which also uses “the early 1990s” and “more than 25 years” elsewhere — these are loosely consistent, not identical, so this guide uses the specific year the site states most often.
- Locations: St. Augustine, Florida (headquarters and manufacturing, 255 Business Park Circle, Suite 503); Tanggu, China (manufacturing).
- Certifications (company-stated): ISO 9001:2015, held by the Tanggu, China facility, with ISO certification maintained there since 2000; IATF 16949, held by the Tanggu facility; the Tanggu facility is also described as a UL-approved wire and cable extruder. RoHS and REACH compliance badges are shown, with no further detail given.
- Product scope: custom wire harnesses, cable assemblies, and coil cords, including flat ribbon, molded, SMA, RF, shielded, coaxial, and Molex cable assembly types, for industrial control, medical, and telecommunications customers (the company’s own served-industries list also names broadcasting and retail security). Designs more than 70% of what it manufactures, carries an in-house library of over 5,000 molds, and states 100% pre-shipment testing for continuity, integrity, polarity, and functionality.
Trade-offs:
- Strength: a published IATF 16949 certificate and a large in-house mold library (5,000+) supporting highly custom builds without outside tooling.
- Limit: both IATF 16949 and ISO 9001 are held at the Tanggu, China facility only, per the company’s own site, so ask for certification status at whichever site would build a US-bound harness. The site describes its industrial, medical, and telecom work only as a list of served industries, with no industry-specific capability detail, so ask directly for specifics relevant to your application.
Precision Cable Assemblies (PCA)
- Founded: not verified in this pass.
- Locations: Brookfield, Wisconsin (manufacturing); Waukesha, Wisconsin (warehousing and distribution); Guadalupe, Nuevo Leon, Mexico; Qingdao, Shandong, China.
- Certifications (company-stated): ISO 9001:2015 for its USA and Mexico sites; IATF 16949:2016 for its China site.
- Product scope: custom wire harness, battery cable, and custom overmolded cable assemblies.
Trade-offs:
- Strength: a published ISO 9001 certificate for its US and Mexico sites, and IATF 16949 at its China site.
- Limit: the company’s own site lists IATF 16949 for the China site only, so ask for IATF status at whichever site would build your US-bound harness.
Sumitomo Wiring Systems (SWS)
- Founded: not stated as an explicit founding-year statement on the company’s own main site in this check. A recruitment subdomain name (sws1917-recruit.com) and a “100th anniversary” content section hint at 1917, but the main site never states a founding year in those words, so this guide does not assert one.
- Locations: not listed with named addresses on the company’s own main site as of this check. The site states only that the company “operates in over 30 countries.”
- Certifications (company-stated): not published on the company’s own main site as of this check.
- Product scope: automotive wire harnesses, automotive electric wires, wire harness components, electronics products, and parts for hybrid and electric vehicles.
Trade-offs:
- Strength: a long-standing, large global automotive-harness specialist with an explicit hybrid/EV product line.
- Limit: the company’s own main site does not publish facility addresses or certifications, so ask directly for the certificate and plant address that would cover your build.
Technical Cable Applications (TCA)
- Founded: 2002.
- Locations: Auburn, Washington (headquarters, per the company’s own site as of this check), with two partner nearshore manufacturing facilities in Guadalajara, Mexico. A 2026 company press release describes moving into a 50%-larger facility and names the city as Seattle, Washington; the company’s own site had not been updated to reflect that move as of this check, so this guide lists both and flags the discrepancy rather than picking one.
- Certifications (company-stated): ISO 9001:2015; UL certified for cable assembly in the US and Canada. The company’s site describes IPC/WHMA-A-620 Revision E as the workmanship standard its technicians follow, not as a certification it holds.
- Product scope: custom and OEM cable assemblies and wire harnesses for industrial, telecommunications, medical, construction, energy, manufacturing, agriculture, and marine customers.
Trade-offs:
- Strength: a published ISO 9001 and UL certificate, plus nearshore Mexico capacity for cost-sensitive volume.
- Limit: the company’s own site gives no employee count or revenue figure, and its stated headquarters city is currently unclear (see above), so confirm the current address and plant before sending drawings.
Yazaki Corporation
- Founded: October 8, 1941.
- Scale (company-stated): 218,566 group employees (17,574 in Japan; 201,019 overseas); operations in 46 countries and regions; 148 group corporations (45 domestic, 103 overseas). These figures are company-wide (all Yazaki business lines), not an automotive-harness-only headcount.
- Locations: Head office in Minato-ku, Tokyo; a named R&D base (“Y-CITY”) in Susono City, Shizuoka Prefecture. North American facility addresses are not stated on the pages reviewed in this check.
- Certifications (company-stated): not published on the corporate “About”/global pages or the Yazaki North America site as of this check.
- Product scope: automotive wire harnesses, connectors, electronic parts, power distribution and control, hybrid/electric-vehicle systems, and driver-information technology.
Trade-offs:
- Strength: very large, long-established global automotive wire-harness and connector supplier.
- Limit: a large global group, so confirm which specific plant would build your harness and what that plant’s own quality certifications are — the company’s own global and North American pages reviewed here do not publish a certification list.
How do I choose between these suppliers?
- Don’t take “OEM approved” at face value. Ask which OEM, which programme, and which specific plant the approval covers — it is never a blanket credential.
- Match certifications to your buyer. Ask for the current certificate for the specific site that will build your harness, not the group certificate.
- Confirm the build location. Headquarters and production sites are often in different countries. Ask for the plant address in writing.
- Test prototype speed. Send the same drawing to two or three suppliers and compare lead times and questions.
- Check fit with your volume. Very large global suppliers and smaller contract shops serve different programmes.
Ready to request a quote?
Sponsored (Cloom Tech): If you want Cloom Tech to quote your harness, send your drawing, expected volumes and target certifications. Request a quote at the Cloom Tech contact page.
