Voltage drop testing is one of the most powerful yet misunderstood electrical diagnostic tools in the automotive world. In this video, we break down what voltage drop really is, how it works, and why it’s far more reliable than simple resistance checks. You’ll learn how to test voltage drop across circuits, spot hidden resistance, and diagnose issues like slow cranking, dim lights, or faulty grounds with confidence.

We’ll walk through real-world examples using multimeters, test leads, and shop-proven techniques so you can apply these skills immediately. Whether you’re chasing a parasitic draw or a charging issue, voltage drop testing will give you the answers you need without the guesswork.

📌 Topics Covered:

What voltage drop is and why it happens

Voltage drop vs resistance testing

Testing power and ground sides of a circuit

Real-world voltage drop examples in the shop

Common mistakes to avoid

🔧 This is a must-know skill for technicians working on modern vehicles. Get ready to diagnose smarter, not harder.