I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8 amp.etc
I did something wrong connecting +ve to -ve or something, not really sure what.
I would have expected the fuse to blow but what happens when it is switched on is all of the LED's come on . It is not connected to the battery.

What is it doing? is it kaput or can I rescue it?

Thanks

Brendan.

On 20/06/16 23:21, Rednadnerb wrote:
I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8 amp.etc
I did something wrong connecting +ve to -ve or something, not really sure what.
I would have expected the fuse to blow but what happens when it is switched on is all of the LED's come on . It is not connected to the battery.

What is it doing? is it kaput or can I rescue it?


suspect rectifier has blown

probably not worth fixing

Thanks

Brendan.



--
How fortunate for governments that the people they administer don't think.

Adolf Hitler

In article ,
Rednadnerb wrote:
I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8
amp.etc I did something wrong connecting +ve to -ve or something, not
really sure what. I would have expected the fuse to blow but what
happens when it is switched on is all of the LED's come on . It is not
connected to the battery.

What is it doing? is it kaput or can I rescue it?

It would have to be a pretty cheap and nasty one if reverse connection
damaged it. They usually have a relay pulled in by battery volts via a
diode, so no connection to the bits that would be damaged by reverse
polarity if you try it.

--
*Until I was thirteen, I thought my name was SHUT UP .

Dave Plowman London SW
To e-mail, change noise into sound.

On Monday, 20 June 2016 23:21:10 UTC+1, Rednadnerb wrote:
I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8 amp.etc

What is it doing? is it kaput or can I rescue it?

the only way to know is to try it


NT

The answer really depends on how it is made, and there are many ways to
build battery chargers of course. I'd say the most likely is a rectifier
death, but it might just be the led meter assembly, you really need a
multimeter to see what is coming out and what it does when loaded to figure
this out.
Brian

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"The Natural Philosopher" wrote in message
...
On 20/06/16 23:21, Rednadnerb wrote:
I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8
amp.etc
I did something wrong connecting +ve to -ve or something, not really sure
what.
I would have expected the fuse to blow but what happens when it is
switched on is all of the LED's come on . It is not connected to the
battery.

What is it doing? is it kaput or can I rescue it?


suspect rectifier has blown

probably not worth fixing

Thanks

Brendan.



--
How fortunate for governments that the people they administer don't think.

Adolf Hitler

It sounds like the LED's show the voltage across a current sensing resistor.
If too much current was taken owing to reversed connection, and the resistor
has blown open-circuit, then all LED's may well come on because of the small
internal current taken by the charger itself.
--
Dave W

"The Natural Philosopher" wrote in message
...
On 20/06/16 23:21, Rednadnerb wrote:
I have a car battery charger with high/ low switch and 4 LED's: 2,4,6,8
amp.etc
I did something wrong connecting +ve to -ve or something, not really sure
what.
I would have expected the fuse to blow but what happens when it is
switched on is all of the LED's come on . It is not connected to the
battery.

What is it doing? is it kaput or can I rescue it?


suspect rectifier has blown

probably not worth fixing

Thanks

Brendan.



--
How fortunate for governments that the people they administer don't think.

Adolf Hitler

I have used the multimeter on it under load and it registers nothing. So I guess that's it then.

Thanks to all.

On 21/06/16 19:32, Rednadnerb wrote:
I have used the multimeter on it under load and it registers nothing. So I guess that's it then.

Thanks to all.

Unless you want to get out a soldering iron and a screwdriver...

Mmm


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making decisions than by putting those decisions in the hands of people
who pay no price for being wrong.€�

Thomas Sowell