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Turn On Buzzer If Fuse Is Blown?

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=146997
Printed Date: May 03, 2025 at 10:00 PM


Topic: Turn On Buzzer If Fuse Is Blown?

Posted By: angelars
Subject: Turn On Buzzer If Fuse Is Blown?
Date Posted: August 23, 2021 at 10:05 AM

I have a circuit in my trunk that is on only when the cars engine is running. How would I wire a relay to a buzzer, that would turn the buzzer on if power is lost?

For example; if a fuse was blown.



Replies:

Posted By: i am an idiot
Date Posted: August 23, 2021 at 3:04 PM
Connect a 12 volt buzzer across the fuse. Positive buzzer wire to the hot side of the fuse, and ground the buzzer to the other side of the fuse.



Posted By: angelars
Date Posted: August 23, 2021 at 8:00 PM
Wouldn't the buzzer sound even if the fuse was good?



Posted By: i am an idiot
Date Posted: August 23, 2021 at 9:47 PM
No. 12 volts on hot side of the fuse and the power wire of the buzzer. 12 volts on the other side of the fuse and the buzzer negative wire. A difference of 0 volts. 0 volts = 0 sound.


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