For almost three decades, American Precision Assemblers (APA) has served industry as a manufacturer and supplier of high-quality custom cable assemblies, wire harnesses, and electronic sub-assemblies. Having started business in a small leased facility, we have since expanded our operations—both in regard to production volume and customer base—to include plants in Hampshire, Hermosillo, and Duluth.

In every project we take on, our expert team aims to provides customers with the highest quality products and services. By offering a comprehensive selection of custom wire harness fabrication services, we ensure that all of their harness needs are fully met.

What Is a Wire Harness?

A wire harness—also referred to as a wiring harness—is a collection of electrical wires enclosed within an exterior sheath. The sheath—typically made from lightweight thermoplastic or thermoset material—facilitates the organization of the wires contained within and protects them from minor damage due to environmental factors.

Wire harnesses find use in the electrical and electronic devices of a diverse set of industries, including in the following:

  • Aerospace
  • Agricultural
  • Aircraft
  • Food and beverage
  • Industrial equipment
  • Industrial vehicle
  • Medical
  • Military
  • Printing
  • Safety and security
  • Wire

For these industries, among others, they serve as a low-cost solution for bundling and organizing a large number of wires and cables. Their design allows industry professionals to install all of the wires necessary for an application at a much faster rate.

What’s the Difference Between a Wire Harness and a Cable Assembly?

Many industry professionals—even those who regularly work with them—use the terms “wire harness” and “cable assembly” interchangeably. While wire harnesses and cable assemblies share some characteristics in regard to design and function, the differences between them ultimately result in distinctly different use cases.

Both wire harnesses and cable assemblies—also referred to as cable harnesses—employ exterior sheaths to organize and protect wires. However, the sheaths used in cable assemblies are made from more durable materials than those of wire harnesses, enabling them to withstand the conditions of heavier duty applications.

The requirements and restrictions of the intended application determine whether a wire harness or cable is more appropriate:

  • Cable assemblies are ideal for use in applications that involve harsh operating or environmental conditions, such as excessive heat, moisture, friction, compression, abrasion, etc. 
  • Wire harnesses are ideal for applications that require a low-cost organizational solution and involve minimal exposure to harsh conditions.

Custom Harness Fabrication Services at APA

At American Precision Assemblers, we provide our customers with high-quality custom wire harness solutions. Our expert team handles all aspects of manufacturing, including:

  • Crimping
  • Cutting
  • Coiling
  • Connecting
  • Sub-assembly integration
  • Marking
  • Soldering
  • Stripping
  • Terminal application
  • Ultrasonic wire welding

We accommodate a wide range of wire harness needs by providing options for various harness features, connector types, coverings, insulation materials, and wire and cable sizes. See the table below for more information.

Contact us today to find out more about our wire harness capabilities. To discuss your unique application with one of our experts, request a quote.

Examples of Custom Wire Harness Building by American Precision Assemblers


General capabilities Contract
Manufacturing Capabilities Crimping
Integrating into Subassemblies
  • High Speed Inkjet Printing
  • Laser Marking
  • Hand Marking
Terminal Application
Ultrasonic Wire Welding
Harness Features Abrasion-resistant
  • Metal
  • Fabric
  • Controls RF Interference
  • Cable Tie
  • Sleeve
  • Electrical Tape
  • Conduit-Flexible
Connector Type Co-Axial
Insulation Displacement
Mil Spec
  • Mil-Circulars
Solder Cup Connections
We Can Apply All Types of Connectors Excluding Fiber Optics, Please Inquire for your Application
Covering Braided
  • Fabric
  • Metal
Plastic Over Molding
  • Up to 1oz Shot Size
  • Tape
  • Fabric
Insulation Type PTFE
We meet any of our clients insulation requirements
Wire and Cable Length 60+ ft 18,288+ mm
Wire/Cable Thickness Min
30 AWG
Testing/Inspection Complete In Process and Final Inspections
Utilizing Cirris Testing Equipment
  • Continuity
  • Component Detection
  • Capacitors
  • Diodes
  • Twisted Pairs
    • Dwell Time: Custom for each application
    • High Voltage Testing
    • Hipot testing
    • Opens
    • Shorts
    Test Reports are generated for each Product
    Custom Harness Boards
    • Ensures Proper Assembly
    • Ensures Proper Connectors are Applied
    Used as a Testing Platform
Production Volume One-Offs
Low Volume to High Volume
Turn Around Times Consignment
J.I.T Deliveries
Kan-Ban Programs
Min-Max Programs
“Breadman” Stock Replenishment Programs
Daily Delivery Available
  • Delivery via APA vehicles; 50 mile radius
Value Added Services Manufacturability Improvements
Product Procurement
Reverse Engineering
Thru Hole Circuit Board Assembly
Value Engineering
Industry Focus Aerospace
Industrial Equipment
Industrial Vehicle
Intended Application Aircraft Equipment
Fuel Injector Harness
Laser Marking Systems
Police & Ambulance Auxiliary Harness’
Nuclear Imaging
Sensor Harness
Vehicle Systems
Industry Standards CSA - Canadian Standards Association (Compliant)
  • IPC WHMA-A-620
  • IPC-JSTD001D
Certified to AS9100 QMS Standard
ITAR - International Traffic in Arms Regulations (Registered)
Mil-Spec - Military Specifications
REACH - Registration Evaluation Authorization and Restriction of Chemical Substances
ROHS - Restriction of Hazardous Substances
UL - Underwriters Laboratories Inc. (Recognized Cable & Harness Manufacturer)
File Formats AutoCAD (DWG)
DXF - Drawing Interchange Format, or Drawing Exchange Format
GIF - Graphics Interchange Format
JPG or JEPG - Joint Photographic Experts Group
PDF - Portable Document Format
TIFF - Tagged Image File Format