This video shows you the inside of a relay and explains how they work with a real world example as well as circuit diagrams. I needed to know, so I researched and made this video. Hope it helps! I know I learned a lot and it will come in very handing for wiring and also diagnosing modifications to my cars.
30/40 AMP Relay 12V Bosch Style (SPDT): amzn.to/3svZvzj
5 Colors Test Lead Set & Alligator Clips: amzn.to/3uEkmCG
Round Rocker Switch 12V 20A: amzn.to/2ZWECB3
Power Probe: amzn.to/3mKIbmU
Bookmark www.the12volt.com One of the best places to get low voltage info, including radio diagrams.
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Disclaimers
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I am a Do It Yourself, also known as DIY, mechanic. I am NOT a professional mechanic. I do not have any formal training in the automotive field.
Help Me DIY assumes no liability for anything you choose to do to your car, before, or after watching one of my videos or utilizing the content from this web site.
All DIY repairs or modifications you perform to your car are made at your own risk. Sometimes, even if you've done everything the right way, you can destroy or damage one or more things on your car. You must understand this, but by leveraging knowledge and patience, the probability of encountering one or more problems can be reduced.
Also, if for some unfortunate reason, I do give incorrect instructions and something breaks because you followed my instructions, I will NOT reimburse or pay in any way for whatever cost that may be incurred due to following my wrong instructions.
Lastly, please don't do anything to your car unless you yourself feel comfortable and confident in doing so.