Automotive Relay Types Explained — Relay Families, Sizes, and Pinouts

Ever wondered why there are so many different types of automotive relays — and which ones you actually need? In this video, we break down the relay “family tree” and explain how each size, pin type, and rating fits into the real world of automotive wiring. From micro to mini, 4-pin to 5-pin, this episode gives you clarity most diagrams never do. 📘 What you’ll learn in this video: • The most common automotive relay sizes (Micro, Mini, 280, Japanese types, and more) • Pin numbers and terminal sizes • The difference between 4-pin and 5-pin relays • Why relay standardization matters — and what those numbers really mean • Quick visual cues to identify unknown relays instantly If you’ve ever opened a fuse box and wondered “which one is this?”, this video finally makes it click. 📥 Download the Relay Reference Chart (PDF) (High-resolution format) https://drive.google.com/file/d/1AGMG... Chapters 00:00 - Why are there so many different relay types? 01:13 - Bosch Mini Relays (The Industry Standard) 01:41 - High Current 80 Amp Mini Relays 02:08 - Japanese Relay Types (Large and Small) 03:05 - Micro Relays with Full-Size Terminals 03:55 - Mini 280 Relays: The Bosch Evolution 04:27 - Micro 280 Relays Explained 05:02 - Ultra Micro 280 (The Compact 1/2" Cube) 05:43 - The 180-Degree Flip Test (Reversible Relay Pinouts) 06:42 - Resistors and Diodes in Relays 07:08 - How Diodes Protect Your ECU/PCM 07:46 - The "Magic Smoke" Warning: Wiring Diode Relays 08:22 - Using the Scrolls of Standardization 08:55 - Downloadable Pinout PDFs and Summary 🎵 Music: Music: Afterglow — Karl Casey ‪@WhiteBatAudio‬ Music: Ghost Protocol — Karl Casey ‪@WhiteBatAudio‬