Practically Classics Forum

Not actually tried this.

If an led is connected across a fuse. When the fuse blows the led completes the circuit and lits up.

The load of the led is very small.

The positive side of the led is connected to the live side of the fuse and negative side of the led to the other side of the fuse which will have a load on it which leads to a negative or earth. Positive earth vehicles the other way round.

I think that a resistor in series with the led will be needed to limit volts or the led will pop.

Maybe one of you electronics guys knows how many ohms. I am at the limit of my led knowledge which ain't a lot.

Bob

This should do what you want it to do, values are marked:

by cracky john thats really testicle!!

Oh my God, Russell Crowe killed Kenny!

Thinking it through. A half watt incandescent light bulb wouls be even easier. The bulb is also not polarity conscious.

Or not bother beacause cars don't blow fuses normally. A better idea is to make sure the fuse box is easy to get at and serviced once in a blue moon.

Still if anybody likes gadgets and making stuff then you may like this idea. JBP has done a circuit. The bits are pennies from Maplin

Bob

History wrote:Or not bother beacause cars don't blow fuses normally.

I think that's the best idea you've come up with so far......

Luxobarge wrote:

History wrote:Or not bother be a cause cars don't blow fuses normally.

I think that's the best idea you've come up with so far......

But imagine the sheer ignominy of only being aware that a fuse has failed when the car's headlamps die on you, on a single track road at dead of night when the last passing place was half a mile back and the distant glow of a very large tractor is coming closer from the front. Oh wait, that's it; you'd be no better off.. Or would you? Yes! Remember dim dips? Lower the value of R2, substitute another transistor for D1 and you could have a failed fuse and some very dim headlamps.

(Please don't..)