fuse blown LED indicator

[jbates58]

hi all. i am wanting to put a led indicator in a project that im building to tell me when the fuse for the circut is blown. jaycar sell a fuse with the led on the end of it, but im after it been seperate. its going in my car, so the voltage varies from 12v - 14.4v, and the fuse is going to be 10A. so i need it wired so that when the fuse blows (if it does) that an led will light up and indicate that it is blown. i imagine that i would need a resistor somewhere before the led, but i dont know how big, and where it needs to go, and i also dont know how to wire it in.

can anyone help?
cheers

jbates58

 

[KMoffett]

1K/1/4W resistor in series with an LED. This is placed between the fuse holder's terminals. LED's positive lead toward the +12V supply end of the fuse. You can also buy 12V LED indicators...basically they already have the resistor inside it.

Ken

 

[Boncuk]

This method works only reliably if the load current is higher than the LED forward current.

That circuit (attached) works with any load current.

Boncuk

 

[crutschow]

If you are concerned about the LED lighting with a small load, then use a high brightness type LED. It would be unusual for a load to not draw a mA or so that will make such an LED readily visible.