How to Choose a Wire Harness Manufacturer in the USA

Disclosure: This guide is published by Cloom Tech. Cloom Tech is one of the companies listed below, and the decision block at the end is a sponsored, disclosed element that routes you to Cloom Tech.

Wire harnesses sit behind almost every powered product, so the manufacturer you choose affects prototype speed, quality documentation, and how the harness performs once it’s in the field. This guide does not rank suppliers. It sets out what to check and gives the same facts for each company so you can compare them yourself.

What should I check before shortlisting a wire harness manufacturer?

Use these criteria for every company in this guide:

• Quality system: which certifications the company publishes, and at which sites.
• Where the harness is built: the company’s own stated locations. Headquarters and production sites are often different.
• Scale and programme fit: facility count, stated experience, and whether the company’s published capabilities suit your volume.
• Product scope: what the company says it manufactures, and whether it does custom work, standard/off-the-shelf parts, or both.
• Prototype-to-production path: whether the company says it supports both.

Figures below come from each company’s own website unless marked otherwise. Anything a company did not publish is left out, not estimated.

Which wire harness manufacturers serve US buyers?

The eight companies are listed in alphabetical order. Order does not indicate quality or preference.

American Precision Assemblers (APA)

• Founded: 1992.
• Locations: 120 Rowell Road, Hampshire, Illinois (its own site lists only this one facility; third-party directories name additional sites, which this pass could not confirm on apaconnects.com).
• Certifications: ISO 9001:2015. Its site also references compliance with IPC/WHMA-A-620, CSA, and UL standards, without calling them formal certifications.
• Product scope: custom cable assemblies, wire harnesses, and electronic box builds. Its own site describes work for medical diagnostic equipment (including a custom wire harness example), automotive programmes (including an electric-vehicle component), emergency-vehicle wire harnesses, and agricultural equipment (cable assemblies built for balers, crop bins, fertilizer sprayers, manure spreaders, planters, and post hole diggers).

Trade-offs:

• Strength: a published ISO 9001:2015 certification and genuine breadth across medical, automotive/EV, emergency-vehicle, and agricultural work.
• Limit: its own site publishes only one facility address, so ask directly about any other production sites before assuming multi-site capacity.

Cloom Tech (Hebei Cloom Electronic Technology Co., Ltd)

Cloom Tech is one of the companies in this guide. Its facts below come from the same kind of own-site checking used for every other company here.

• Founded: 2017 (per its own site’s “Since 2017” experience marker).
• Locations: Shijiazhuang, Hebei, China (headquarters and plant, 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; ISO 13485 (medical wire-harness production).
• Product scope: custom wire harnesses and custom cable assemblies, built to customer specifications. It does not manufacture standard or pre-built harnesses, and it does not sell standalone connectors. It consults on manufacturability and offers professional recommendations, but does not provide its own harness design service.

Trade-offs:

• Strength: an IATF 16949 certification, plus ISO 13485 for medical wire-harness production.
• 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. It only builds to your specification — it does not supply catalogue/off-the-shelf harnesses, standalone connectors, or its own design service.

Cypress Industries

• Founded: not stated with a specific year; its own site says only that it “was founded in Austin, Texas.”
• Locations: corporate address 2750 Burbank St, Dallas, TX; wholly-owned manufacturing facilities in Mexico, India, China, and the United States (no further addresses published for these).
• Certifications: “ISO9001:2015 certified” manufacturing facilities, with 100% final inspection stated. No IATF or ITAR certification is named on its own site.
• Product scope: a vertically integrated contract manufacturer. Wire harness lines include industrial and braided harnesses, automotive wire harnesses (including alternative-energy vehicle types: flex-fuel, natural gas, LPG, hybrid-electric, plug-in), and truck and trailer harnesses. Cable assembly lines include industrial, oil and gas, solar, and several electronics/data cable types. It also offers custom control panels, PCB assembly, metal fabrication, and plastic injection molding. Its own braided-harness page names oil and gas, agriculture, solar and wind energy, HVAC, and general industrial equipment (cranes, pumps and fans, pneumatic/hydraulic systems, lift stations) among the industries it serves.

Trade-offs:

• Strength: a vertically integrated range — wire harnesses, cable assemblies, control panels, PCB assembly, and plastics — under one ISO 9001:2015-certified manufacturer, with global facilities in Mexico, India, and China.
• Limit: no founding year or employee count is published, and its own site doesn’t confirm IATF 16949 at any specific facility, so ask which site would build your harness and what that site’s current certificate covers.

Matric Group

• Founded: not stated with a specific year; its own site says it has served OEMs “for more than 50 years.”
• Locations: Matric Limited (headquarters), 2099 Hill City Road, Seneca, PA; Dynamic Manufacturing (Pittsburgh region), 156 Armstrong Drive, Freeport, PA. Described as “two U.S.-based EMS facilities.”
• Certifications: ISO 13485:2016.
• Product scope: an electronics manufacturing services (EMS) contract manufacturer. Its own site names several market verticals: industrial and embedded systems, energy/power and infrastructure systems, life sciences and regulated medical devices, fintech/secure transactions and digital systems, and transportation/heavy-equipment/mobility systems — each described only in a one-line tagline, with no named example products. Its “Cable & Harness Assembly” service page describes custom cable assemblies and wire harnesses (coaxial, ribbon, power, and signal cables; point-to-point and multi-branch harness designs), crimping, termination, connector installation and overmolding, a six-stage build process (requirements review, material verification, assembly, inspection and testing, system integration, life-cycle support), and component traceability/obsolescence monitoring under its Product Life Cycle Management programme.

Trade-offs:

• Strength: an ISO 13485:2016-certified facility with a named, detailed cable-and-harness-assembly process (six build stages, specific cable types, inspection/testing steps) and five distinct market verticals.
• Limit: its site gives only a one-line description for each market vertical, with no concrete product examples or customer names, and does not publish a founding year or headcount — ask for examples specific to your industry before assuming fit.

Mercury Electronics

• Founded: 1946 (“Since 1946,” per its own site).
• Locations: 3846 Green Valley Road, Seven Valleys, Pennsylvania.
• Certifications: a DNV-certified quality management system; “UL Recognized for Wiring Harnesses” under UL File E163115 (covering the US and Canada); IPC/WHMA-A-620 stated as its default workmanship standard unless a customer contract specifies otherwise.
• Product scope: custom electrical and electronic assemblies — cable assemblies, wire harnesses, and enclosure wiring — supporting prototype through high-volume production, with just-in-time delivery, engineering design support and manufacturability review of customer documentation, and First Article Inspection/PPAP support. Its own site names heavy equipment, transportation, HVAC, and other commercial industries among the markets it serves, without further per-market product detail.

Trade-offs:

• Strength: a DNV-certified quality system plus a UL-recognized wiring-harness listing (UL File E163115) — a concrete, checkable certification most smaller harness shops don’t publish.
• Limit: its site names the markets it serves (heavy equipment, transportation, HVAC, “commercial industries”) without describing specific products or customers in any of them, so ask for examples relevant to your application. Its site’s copyright date reads 2018, so confirm current certifications are still active before relying on them.

Meridian Cable Assemblies

• Founded: 1994 (its own site cites this inconsistently alongside “over 25 years” and “the early 1990s” elsewhere on the same site).
• Locations: headquarters at 255 Business Park Circle, Suite 503, St. Augustine, Florida; a second manufacturing facility in Tanggu, China.
• Certifications: ISO 9001:2015 (maintained “since 2000,” per its own site) and IATF 16949, both held by the Tanggu, China facility. The company also describes itself as UL-approved and can certify individual products to display the UL Mark. REACH-compliant and RoHS-compliant logos are also displayed.
• Product scope: custom cable assemblies, coil cords, molded/overmolded components, and wire harnesses, for small-batch and full-production runs. Its own site states it designs more than 70% of its products in-house and maintains an inventory of more than 5,000 existing tools/molds, with 100% product testing. It names automotive, medical, industrial controls, telecommunications, broadcasting, energy, and retail security among the markets it serves.

Trade-offs:

• Strength: a published ISO 9001:2015 and IATF 16949 certificate (at its China facility), a UL-approved manufacturing claim, and a wide non-automotive market spread (medical, industrial controls, telecom, energy, retail security).
• Limit: its certifications are stated for the Tanggu, China facility only, so ask which site — Florida or China — would build your harness and what that site’s current certificate covers. Its own site is inconsistent about its exact founding date.

Precision Cable Assemblies (PCA)

• Founded: 1980.
• Locations: Brookfield, Wisconsin (headquarters; wire harness and battery cable assembly), Waukesha, Wisconsin (warehousing and distribution), Guadalupe, Nuevo León, Mexico (manufacturing), and Qingdao, Shandong, China (manufacturing).
• Scale (company-stated): more than 35 years of industry experience; a single SAP-based management information system across all facilities. No employee count or revenue figure is published.
• Certifications (company-stated): ISO 9001:2015 for the USA and Mexico sites; IATF 16949:2016 for the China site (its own page misspells this “ITAF 16949:2016” in one place).
• Product scope: wire harnesses, battery cable assemblies, and custom cable overmoulding, for OEMs worldwide. Its own case studies reference UTVs, marine, generator sets, refrigerators, lawn and turf care, small engines, semi-trailers, and off-highway equipment.

Trade-offs:

• Strength: a published ISO 9001 certificate for its US and Mexico sites, IATF 16949 at its China site, and three distinct product lines (harnesses, battery cables, overmoulding).
• 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. It does not publish a certification covering medical or other tightly regulated work.

Star Engineering

• Founded: sometime in the 1980s (its own site says it has “been around since all the way back in the 1980’s”; a third-party supplier profile states 1980 specifically, which this pass could not independently confirm on starengineeringinc.com).
• Locations: One Vaillancourt Drive, North Attleboro, Massachusetts — its own site lists only this one facility.
• Certifications: its own site states a “various certifications recognized across North America” claim with an unlabelled ISO logo, and separately names IPC/WHMA-A-620 as its default cable-and-harness workmanship standard. No specific ISO standard number or certificate is published on the pages reviewed.
• Product scope: an in-house contract manufacturer across three lines: printed circuit board assembly (surface-mount and through-hole), custom cable and wire harness assemblies, and electro-mechanical assemblies (box builds and control panels). Its cable-and-harness equipment list includes a complete cable cutting center, wire cutters and programmable wire strippers, a terminating machine, and a wire crimping machine. Its own site names automotive, marine navigation and oceanography, medical and life sciences, industrial equipment, and automation equipment as markets it serves, without further description for any of them.

Trade-offs:

• Strength: fully in-house, vertically integrated capability across PCB assembly, cable/harness assembly, and box builds, with a named default workmanship standard (IPC/WHMA-A-620).
• Limit: its own site doesn’t name a specific ISO certificate number, and gives no per-market product detail for any of the five markets it lists, so ask for its current certificate and examples relevant to your industry. Only one facility address is published.

How do I choose between these suppliers?

1. Match certifications to your buyer. Ask for the current certificate for the specific site that will build your harness, not a group-wide claim.
2. Confirm the build location. Headquarters and production sites are often different. Ask for the plant address in writing.
3. Test prototype speed. Send the same drawing to two or three suppliers and compare lead times and questions.
4. Ask what the company will and won’t do. Some suppliers only build to your design; others also offer design input, prototyping, or vertically integrated extras like molding or PCB assembly. Confirm which before you commit.
5. Check fit with your volume and industry. A facility built for high-volume programmes and a smaller shop serve different needs, and not every supplier publishes detail for every market it claims to serve.

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.