In this video I break down exactly how an automotive relay works and explain the difference between the control side and the load side.
We’ll go over what pins 85, 86, 30, and 87 actually do, what happens inside the relay when it’s energized, and why vehicles use relays to control higher-current circuits with lower-current switches and modules.
If relays have ever seemed confusing, this should make them a lot easier to understand.
In the next video, I’ll show you how to actually test a relay and diagnose whether the problem is the relay itself, the control side, or the load side.
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