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.

[jacksonpuckett]

Great video. Excellent. Diagrams and examples were perfect. I'm a mechanic 8 years and like to refresh my memory from time to time. It doesn't have to be anymore complicated to explain a relay than this. Using the low and high beam is a perfect example for the double pole. Best demonstration video I've ever found on youtube. Perfect length, narration, and description, and illustration. I love it.

[kiyoshi]

where everyone else is over 10 minutes, you got it done perfectly in less than 2. THANK YOU

[Dan-jblz]

Thank you! Clear, concise and to the point.

[AwesomeSmiley]

Most helpful and easy explanation. Thanks!

[johntchb]

Would they ever be used to switch from side light to headlight?and would there be one for left and one for right?

[LegendLength]

I wonder if i can use one of these relays for my garden lights. I want to detect if solar panel has power in the cable. Then enable battery 12 v to the lights if so. These seem like a good solution if i can find some free ones.

[letsbefrank]

Hi, when I use my horn the horn fuse blows, what could be the issue? 99 DX Y61 Nissan Patrol.

[EzanaFasil-nw]

Is it safe to power fuel injector relay from another relay....ecu pulse is weak to fuel injector car won't start

[harrish]

So my r33 has 2 relays next to the ecu. Thry dont click that means no power to ecu.my question is all 4 wires are + and no negative feed.is this a problem. Plys 2 eires has 12.4v and 2 has 11.2 v

[gloriousloloy]

Whats the difference between Switches and Relays ?

[timteahan]

Great video but you have not explained why some relays have diode or resister on some relays and there purpose and have not said where they should not be used

[xuechen]

Good video of lock, we take pride of automatic assembly machine of lock from Xiamen Boaote Automation Technology Co., Ltd.

[sikhlo]

how to number way 30 .58 please reaplay

[FroztiProductions]

So this would be a 5 pin relay. For the 4 pin like the giant one in the middle of the thumbnail, change "normally closed" to "always open" or erase it entirely.