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Auto Electrical Relays Explained - How they work and where they're used.

An explanation of automotive electrical relays and how they work, using a small current to switch a larger load without running heavy cables to heavy duty switches on your dash board. The two types explained in this video are single contact/throw as used when modifying and adding spotlights etc. and the second type is a double throw/change relay quite often found in headlight circuits. A good piece of knowledge to have when electrical fault finding on cars and trucks electrical systems, as if you know how it works then you can understand when it doesn't work. If you like what you see hit the like button, and if you would like to see more subscribe to Educational Mechanics here: https://www.youtube.com/user/Mattski6... Visit our website for a larger collection at: http://edumech.co.uk Join us on Facebook:   / educationalmechanics  

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