# H&L Manufacturing

> Family-owned contract manufacturer in Middleville, Michigan since 1967. Custom wire harness assembly, overmolding, control panel assembly, general assembly, prototyping, and 3D printing. ISO 9001:2015 certified (Intertek), UL Approved, IPC/WHMA-A-620 workmanship. Every harness 100% continuity tested with integrated vision systems.

Contact: 269-795-5000 · info@hlmanufacturing.com · 900 East Main Street, Middleville, MI 49333
Hours: Monday–Friday, 6:30 AM – 3:00 PM EST

## Services

- [Wire Harness Manufacturing](https://hlmanufacturing.com/services/wire-harness-manufacturing): Custom wire harnesses from prototype to production
- [Overmolding](https://hlmanufacturing.com/services/overmolding): Sealed overmolded connectors and assemblies for harsh environments
- [Control Panel Assembly](https://hlmanufacturing.com/services/control-panel-assembly): Complete panel builds with wiring, mounting, labeling, and testing
- [General Assembly](https://hlmanufacturing.com/services/general-assembly): Box builds, sub-assemblies, kitting, turnkey assembly
- [Prototyping & 3D Printing](https://hlmanufacturing.com/services/prototyping): Rapid prototypes and additive manufacturing

## Company

- [About](https://hlmanufacturing.com/about): History since 1967, leadership, mission, values
- [Press & Media](https://hlmanufacturing.com/about/press): Wiring Harness News features (2018, 2025)
- [Industries](https://hlmanufacturing.com/industries): Automotive, consumer/commercial, RV & recreational, utility trailers, industrial controls, agriculture & heavy equipment
- [Quality](https://hlmanufacturing.com/quality): Certifications, testing capabilities, customer awards, KPIs
- [Careers](https://hlmanufacturing.com/jobs): 1st-shift production hiring
- [Request a Quote](https://hlmanufacturing.com/request-quote): RFQ with drawing/spec upload
- [Contact](https://hlmanufacturing.com/contact)

## Technical Resources

- [What Is a Wire Harness?](https://hlmanufacturing.com/resources/what-is-a-wire-harness)
- [Wire Harness vs. Cable Assembly](https://hlmanufacturing.com/resources/wire-harness-vs-cable-assembly)
- [How to Choose a Wire Harness Manufacturer](https://hlmanufacturing.com/resources/how-to-choose-manufacturer)
- [What Is Overmolding?](https://hlmanufacturing.com/resources/what-is-overmolding)
- [Wire Gauge Selection Guide](https://hlmanufacturing.com/resources/wire-gauge-selection-guide)
- [IPC/WHMA-A-620 Standards](https://hlmanufacturing.com/resources/ipc-whma-a-620-standards)
- [Connector Selection Guide](https://hlmanufacturing.com/resources/connector-selection-guide)
- [Wire Harness Design Best Practices](https://hlmanufacturing.com/resources/wire-harness-design-best-practices)

## Full Content

- [llms-full.txt](https://hlmanufacturing.com/llms-full.txt): Complete text content of every page on this site