LED's for blown fuses......
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Junior User
Joined: Sep 2001
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LED's for blown fuses......
I was wondering how I could wire a small box with led's in it to my fuse box, so when a fuse would blow, the corresponding led would come on. A schematic would help. Thanks
Fleet Owner
Joined: Aug 2001
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From: Drummonds, TN USA
LED's for blown fuses......
Good answer!
I would typically use a higher resistance though - 600 to 1000
1K resisters are a dime a dozen, too
600 = blue/black/brown
1,000 = brown/black/red
~ Wolf
I would typically use a higher resistance though - 600 to 1000
1K resisters are a dime a dozen, too
600 = blue/black/brown
1,000 = brown/black/red
~ Wolf
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Joined: Jan 2001
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From: Virginia
LED's for blown fuses......
If I remember correctly, most led's need 20ma of forward current and have a voltage drop of 1.2 volts. 12volts - 1.2volts = 10.8volts
E=Ixr 10.8volts divided by .020 amps = 540 ohms rounded off to nearest value = 560 ohms.
that's where I got 560 for the resistor value. That is assuming 12 volts, which your values would give a little headroom for higher voltage. 600 ohms isn't a standard value, I thought 560 was, but I just looked on an assortment I had and it went from 470 to 680. So I guess 680 would be a good choice along with the 1K.
E=Ixr 10.8volts divided by .020 amps = 540 ohms rounded off to nearest value = 560 ohms.
that's where I got 560 for the resistor value. That is assuming 12 volts, which your values would give a little headroom for higher voltage. 600 ohms isn't a standard value, I thought 560 was, but I just looked on an assortment I had and it went from 470 to 680. So I guess 680 would be a good choice along with the 1K.
Posting Guru
Joined: Jan 2000
Posts: 1,899
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From: Cullman Alabama
LED's for blown fuses......
Just asking here, but could you also put an led across the Load, say for instance right out of the Fuse block, and that way, when the Fuse Blew, the Led would go out! That might be a little easier to wire in.
The argument against this 'Status monitor way', is 'the Led would be on all the time' using a little current all the time. SO if you left the Truck in the Long term parking for a week, you might come back to a Discharged Battery.
That makes a pretty good case for the First suggestion!
The argument against this 'Status monitor way', is 'the Led would be on all the time' using a little current all the time. SO if you left the Truck in the Long term parking for a week, you might come back to a Discharged Battery.
That makes a pretty good case for the First suggestion!
New User
Joined: Dec 2001
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LED's for blown fuses......
Not exactly what you want but I noticed at parts store a "cap" that fits ontop of a fuse and if the fuse blows it lights up. Not as nice as what it sounds like you want but it does make it easy to tell when a fuse is blown.
Bones
Bones
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