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Turn On Buzzer If Fuse Is Blown?


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angelars 
Copper - Posts: 176
Copper spacespace
Joined: November 06, 2006
Location: United States
Posted: August 23, 2021 at 10:05 AM / IP Logged Link to Post Post Reply Quote angelars
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.
i am an idiot 
Platinum - Posts: 13,581
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 23, 2021 at 3:04 PM / IP Logged Link to Post Post Reply Quote i am an idiot
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.
angelars 
Copper - Posts: 176
Copper spacespace
Joined: November 06, 2006
Location: United States
Posted: August 23, 2021 at 8:00 PM / IP Logged Link to Post Post Reply Quote angelars
Wouldn't the buzzer sound even if the fuse was good?
i am an idiot 
Platinum - Posts: 13,581
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 23, 2021 at 9:47 PM / IP Logged Link to Post Post Reply Quote i am an idiot
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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