Custom Offroad Wiring & Fabrication Built to Perform

Custom Wiring Harnesses • Switch Panels • Lighting • Plasma Cutting

Fastline Wiring and Fabrication builds professional wiring systems

and custom fabricated parts for offroad vehicles, race trucks, UTVs, Jeeps,

and custom builds. Our work is clean, reliable, and built to handle harsh

environments.

Located in San Tan Valley, Arizona – Serving Phoenix and Surrounding Areas

Our Services

A black Fastline wiring harness coiled in a circle, featuring a fuse block with relays and various terminal connectors.

Custom Wiring Harnesses


We design and build complete custom wiring harnesses for offroad vehicles, race trucks, UTVs, and custom builds. Our wiring is clean, organized, and built for reliability and easy service.
A vehicle switch panel with illuminated red labels, buttons, and toggle switches, mounted above a cluster of wiring looms.

Switch Panels & Lighting Wiring


We install and wire switch panels, light bars, rock lights, accessories, radios, GPS units, and electrical systems for offroad and performance vehicles.
A machine cuts metal plates on a workbench, creating bright sparks, with several finished steel parts lying nearby.

Plasma Cutting


We provide custom plasma cutting for brackets, tabs, plates, gussets, mounts, and custom metal parts for offroad and fabrication projects.

Why Choose Fastline Wiring and Fabrication

Fastline Wiring and Fabrication specializes in professional wiring for offroad and performance vehicles. Our work is clean, organized, and built to handle harsh environments including vibration, heat, dust, and mud. Whether you need a complete wiring harness or custom fabricated parts, we build every project to be reliable and easy to service.


✔ Clean, professional wiring

✔ Built for offroad conditions

✔ Custom built for your vehicle

✔ Fast turnaround times 

✔ Serving AZ offroad community

✔ HP Academy Certified

LATEST FROM FASTLINE

New in the Shop

Follow our latest customer builds, wiring projects, fabrication work,

off-road events, and behind-the-scenes updates.

Latest Projects

Showcase our newest completed wiring harnesses, fabrication work, lighting installs, and custom vehicle builds.

View Projects

Shop Gallery

See behind-the-scenes photos from the shop, wiring in progress, fabrication work, and completed customer vehicles.

Browse Gallery

Off-Road Events

Follow Fastline at Baja, King of the Hammers, local desert races, and other events where we support and connect with the off-road community.

View Events

Who We Work With

We work with individual vehicle owners, race teams, offroad builders, and automotive shops.


  • Offroad Race Trucks 
  • Prerunners
  • Rock Crawlers
  • UTVs
  • Jeeps
  • Overland Vehicles
  • Automotive Shops
  • Race Teams
  • Custom Truck Builders


Contact

Need a custom wiring harness or fabricated parts for your offroad vehicle or race build? Contact Fastline Wiring and Fabrication today to discuss your project.

Contact

Need a custom wiring harness or fabricated parts for your offroad vehicle or race build? Contact Fastline Wiring and Fabrication today to discuss your project.

Frequently Asked Questions

  • What services do you offer?

    We offer custom wiring harnesses, switch panels, plasma cutting, metal fabrication, and custom automotive and off-road electrical work. If you have a custom project, contact us to discuss your build.

  • Do you work on off-road vehicles and custom builds?

    Yes, we specialize in off-road vehicles, race vehicles, custom builds, and project vehicles that need wiring, fabrication, or custom metal work.

  • Do you offer custom fabrication?

    Yes, we design and build custom brackets, mounts, panels, and metal parts for automotive, off-road, and custom projects.

  • How do I contact you?

    You can call us or fill out the contact form on this website. Please include as much information as possible about your project, including measurements, materials, and timeline.

  • What areas do you serve?

    We serve customers throughout the Phoenix area and surrounding cities. Contact us to see if we can help with your project.

  • How long do projects usually take?

    Project time depends on the size and complexity of the job. Small jobs can often be completed quickly, while larger custom projects may take more time.

  • Do you work on both small and large jobs?

    Yes, we handle everything from small custom parts to larger fabrication and wiring projects.

  • Can you help design my project?

    Yes, if you have an idea, sketch, or measurements, we can help design and build your project.

  • What is the best way to contact you?

    The fastest way to reach us is by phone, but you can also use the contact form on this website and we will get back to you as soon as possible.

  • Do customers need to buy parts through Fastline?

    No. Customers are welcome to provide their own switches, lights, panels, accessories, and electrical components for their build. Fastline Wiring & Fabrication guarantees the quality of the wiring installation itself, but cannot guarantee the performance or reliability of customer-supplied parts.

  • What is your vehicle pickup & storage policy ?

    Completed vehicles must be picked up on the agreed-upon pickup date. Vehicles not picked up as scheduled may be subject to a $100 per day storage fee beginning the following day, unless other arrangements have been approved in advance by Fastline Wiring & Fabrication.

Tell Us About Your Project

Fastline Wiring and Fabrication builds custom wiring harnesses for offroad vehicles, race trucks, UTVs, rock crawlers, and custom automotive builds. We also provide offroad fabrication including brackets, mounts, battery trays, and custom aluminum and steel parts. Fastline Wiring and Fabrication serves Phoenix, Scottsdale, Mesa, Chandler, Gilbert, Glendale, Peoria, Surprise, and customers throughout Arizona. If you need a custom wiring harness builder or offroad fabrication shop in Arizona, contact Fastline Wiring and Fabrication today.