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Indicator Light for Electric Fan


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jay_poorsport 
Member - Posts: 4
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Joined: October†24, 2020
Posted: October†24, 2020 at 10:16 AM / IP Logged Link to Post Post Reply Quote jay_poorsport
Hello all,
Let me first say this site has proven to be extremely helpful in the past as I have used a few to the diagrams without much knowledge of electricity and itís functions.
Hers is my dilemma. Iíve installed an electrical fan in my vehicle. I would like to install an indicator light so I know when it is on. Iíve found very limited information online so Iíve come here a I know someone smarter then me would know a solution. Simply tapping the power feed of the fan would cause a back feed that would cause a false indication of the fam on when air is flowing thru the fam causing it to generate electricity. People have mentioned using a diode however they also say the power output of the fan would be lessened because of it. This is not ideal.   
My idea would be to somehow install a relay that would get power to trigger the relay only after the fans actually came on. (If that makes sense) and in turn power the light.
I appreciate any help you can offer.
Best regards,
Jay
geepherder 
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Joined: October†27, 2003
Posted: October†24, 2020 at 12:15 PM / IP Logged Link to Post Post Reply Quote geepherder
It's a little extra work, but you could add another relay to power the fan. The original power output to the fan could both power your indicator light, as well as trigger a relay to power fan. That would eliminate any false indication from electricity generated by the motor.
My ex once told me I have a perfect face for radio.
jay_poorsport 
Member - Posts: 4
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Joined: October†24, 2020
Posted: October†24, 2020 at 3:16 PM / IP Logged Link to Post Post Reply Quote jay_poorsport
Thank you so much for the reply. I hate to be the guy but could I trouble you for a diagram? Iím still trying to understand for relays work.
geepherder 
Platinum - Posts: 3,587
Platinum spaceThis member consistently provides reliable informationspace
Joined: October†27, 2003
Posted: October†24, 2020 at 4:53 PM / IP Logged Link to Post Post Reply Quote geepherder
It would basically be like this diagram:
https://www.the12volt.com/relays/relaydiagram25.html
The old power lead from the fan would go to 86. The indicator would also connect to 86.
Ground 85.
Connect a fused 12 volts to 87.
Fan now connects to 30.
My ex once told me I have a perfect face for radio.
jay_poorsport 
Member - Posts: 4
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Joined: October†24, 2020
Posted: October†24, 2020 at 9:29 PM / IP Logged Link to Post Post Reply Quote jay_poorsport
Thank you geepherder! I guess itís confusing because I had it set up as per the manufacturer instructions. But now I think I understand it. 🤞🏽

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