Sumitomo HM Sealed Series (090) Connectors Explained | Assembly & Terminal Removal

The Sumitomo HM Sealed Series is a compact weatherproof connector system found on many older Japanese automotive and motorcycle wiring harnesses. In this Connector Academy episode, we take a detailed look at the HM Sealed Series 090 (2.3 mm) connector family, covering its construction, sealing system, terminals, wire seals, and proper assembly techniques. You'll learn how the connector is designed, how to crimp and install the terminals, how to depin them without damage, etc. Connector Academy is a series dedicated to understanding automotive electrical connectors, wiring systems, and professional harness construction techniques. Reference material: Sumitomo Wiring Systems Connectors for Automobiles product catalog (used for educational reference). 0:00 – Introduction to Sumitomo HM Sealed Series 0:14 – Application & Use Cases (Automotive & Motorcycles) 0:45 – Terminal Size (2.3mm) & Gauge Recommendations 1:23 – Breakdown of Seals & Dummy Plugs 1:31 – Housing Cutaway: Internal Locking Mechanism 2:07 – Step-by-Step Crimping Process 3:01 – Inspecting a Good Crimp 3:20 – Male Terminal Insertion into Housing 3:54 – Terminal Removal Guide (Male) 4:27 – Female Terminal Insertion & Removal 4:54 – Summary & Final Thoughts Music: Touch the Sky --- Karl Casey‪@WhiteBatAudio‬ Voyager --- Karl Casey‪@WhiteBatAudio‬