Fuse block LED's

alright here are a few diagrams that will work...

The first 3 all do the same thing in a different way. first one uses a relay, and a resistor, 2nd one uses some reistors and a diode, third uses some resistors and a transistor.

The next 2 diagrams are to shut it all off when the car is not running. This is only needed is the fuse has power when the car is off, if it doesnt have power when the car is off this is not needed. First one uses a transistor, second uses a good old automotive relay.

Also the circuits all derive power from the unfused side of the fuse, i only did this to make the diagrams much easier to read, but would recommend, that the lead that is attached to the unfused side actuallt be connected to a fused power source of its own.

The reason i drew 3 different diagrams is just to allow you to choose the one you want, I would reccoment the first one if you are only going to hook this up to one or two fuses and want the ability to use a dual color common cathode LED.

The second one i would recommend if you are using it for 1 or more, but do not plan on using a dual color LED.

The third i would recommend for 2 or more, a dual color LED can be used with this set up. I only say 2 or more because it uses a transistor, most people dont have transistors laying around (just about any PNP transistor will do). This setup uses much less current than the relay diagram and slightly less than the 2nd diagram.

The second last circuit (the relay used to shut this off), I would recommend this for any number of fuses because of the current this wll aloow.

The last circuit (same purpose as previous) i would use only for less than 10 fuses. although the resistor value can be changed to allow about 20 to be used.

Let me know if you guys use these or want more info.

ohh if you want to use a switch just use it to apply ground to any of the first 3 circuits.

Dont be afraid of the circuits, to some they may look complicated but they are really not, if you have any questions just let me know.

hah thanks wvsquirrel,

For 10 fuses i would definitly go with the third one, you want to hook it up so that the fuse in the diagram(looks like a sine wave labeled F1 or F2) is wired so that the right side is the ouput of the fuse, the side that has no power when the fuse is removed. The reason it has power from the other side also is so that the red can illuminate when the fuse is actually blown.

Yes you would have to use the circuit for each fuse, its really not as difficult as it looks, i could probably make the circuit for all 10 on a 2" x 2" board, you defintly want to use some perf-board or a circuit board or it will become a big mess, lol