LED Problem (1 Viewer)

[Badknee]

Oh, I see that their dismantling our gas works and moving it to Preston so you will be fine soon, we're going to newclear power so I'm told.
This picture was taken last Wednesday.

 

[Dawn B]

I always knew you were wired wrong @Tootles

 

[Badknee]

I always knew you were wired wrong @Tootles

He's got a short cuicuit but we knew that all along.

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[Dawn B]

He's got a short cuicuit but we knew that all along.

He's got a short skirt, too

 

[Fletton]

Is notloB an anogram of Nob lot...
Jus askin!..

 

[Tootles]

I'll get my car fixed when we get back after Easter

Gas problem??

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[Tootles]

I always knew you were wired wrong @Tootles

Dawn, this is a LED bulb problem thread, and not a fat lady bulbous problem thread.

 

[DuxDeluxe]

Toots, where did you get the red lamps from?

We have the same bathroom as you, bottom lamp is almost dead now so was thinking of changing them to LED's.

If I can buy some the same I will try them in ours and see what happens

You mean that there are two motorhomes with a bathroom looking like a pimps boudoir?

Dawn, this is a LED bulb problem thread, and not a fat lady bulbous problem thread.

It ain't over until the fat lady sings, you know........ (Reaches for earplugs....)

 

[Dawn B]

Dawn, this is a LED bulb problem thread, and not a fat lady bulbous problem thread.

And......?

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[Tootles]

You mean that there are two motorhomes with a bathroom looking like a pimps boudoir?

Ali says your dead for calling her a pimp.

 

[Dawn B]

Ali says your dead for calling her a pimp.

Yay

 

[Tootles]

And......?

And, maybe you should watch this??

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[Dawn B]

And, maybe you should watch this??

Nah, these things never end well

 

[Tootles]

Nah, these things never end well

Don't worry, you wont turn black!!

 

[DuxDeluxe]

Ali says your dead for calling her a pimp.

Your bathroom.........

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[Tootles]

Your bathroom.........

You think?? Ask her, I own nowt.

 

[andy63]

Don't worry, you wont turn black!!

Pity...
Meantime back on track please... It's a funny one and I can't for the life of me think why your led won't work..
You say you have checked the supply for voltage and polarity...
And each led will power on if connected to a battery...It's sort of defying logic...

 

[Al1]

The original bulbs couldn't be connected in series like a Xmas tree, that would show 12v with one unplugged?
Al

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[pappajohn]

I know John. With the wiring in the original position, the standard bulbs worked, but not the LED's However, when I reversed them, neither worked. Got to be a resistor somewhere.

Nothing would prevent filament bulbs working either way round.....if they work one way they WILL work the other.....unless the standard bulbs have a diode built in, which I have never seen as tjeres no point.
The + & - feed wires only go to each end of another wire....the one inside the bulb.

 

[Tootles]

Nothing would prevent filament bulbs working either way round.....if they work one way they WILL work the other.....unless the standard bulbs have a diode built in, which I have never seen as tjeres no point.
The + & - feed wires only go to each end of another wire....the one inside the bulb.

No bulb diode's. And the stranded bulbs will not work with the polarity reversed.
The push button switch unit is very large for the job, and gets it's feed directly from a choc block behind the light unit. This chock block also powers a strip LED over the dinette, which works fine, and so this problem is either in the switch, or the wiring from the switch to the individual lamp sockets in the bathroom unit, which is standard feed. I suspect the switch, but cant confirm this without a trip to the storage. Why would a simple switch be fitted with such a circuit?

 

[CeeJay13]

Intriguing!

A filament lamp is basically a resistor, no polarity. The only thing that I can think of that would affect the circuit is some sort of controller somewhere in the feed wiring (possibly switch or light fitting), but that still shouldn't affect the filament lamps. As for the LEDs, they 'could' be affected by some control circuitry in the feed.

I agree with you that the next best step is to provide an alternative feed from before the switch which you have already proven to be good for LEDs to bypass the switch, if they still don't work I would suspect either the fitting or some other control circuitry.

Really don't understand why the lamps won't work t'other way around!

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[Tootles]

Intriguing!

A filament lamp is basically a resistor, no polarity. The only thing that I can think of that would affect the circuit is some sort of controller somewhere in the feed wiring (possibly switch or light fitting), but that still shouldn't affect the filament lamps. As for the LEDs, they 'could' be affected by some control circuitry in the feed.

I agree with you that the next best step is to provide an alternative feed from before the switch which you have already proven to be good for LEDs to bypass the switch, if they still don't work I would suspect either the fitting or some other control circuitry.

Really don't understand why the lamps won't work t'other way around!

Yes Colin, got me stumped as well. Here's what I did, from the beginning......

Took off the light cover, removed all the bulbs, fitted the LED's, switched on......Nothing.
Tested the LEDs in the overbed spotlight.....All working.
Tried two LED's and two standard bulbs in the bathroom fitting. Standard bulbs came on, LED's didn't.
Took off the complete unit, reversed the blue and black wires (German wiring), at the chocy block.......LED's not working, standard bulbs not working. Replaced wires back to how they were.
Checked both polarity and voltage at each bulbholder. Positive feed center, negative to the side fitting. Voltage reading 13.2 DC.
Checked that the LED's were in full spring contact to the bulbholder, and that the neg tag was touching the bulb side.....Fine.

Trying to find a piccy of this HUGE push to turn on switch............

 

[Badknee]

Ah, I think you have it there. As said filament bulbs will not be effected by reversing the + - as it's just a piece of wire getting hot but yours were so it has to be the switch.

 

[Tootles]

Ah, I think you have it there. As said filament bulbs will not be effected by reversing the + - as it's just a piece of wire getting hot but yours were so it has to be the switch.

Cheers Paul, but I have to find out WHY Hymer would fit such a switch. Is it to protect something? Maybe some German construction ruling about electricity and bathrooms? Trawled the web, but nothing. A phone call to Brownhills in the morning, I think.

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[pappajohn]

Ah, I think you have it there. As said filament bulbs will not be effected by reversing the + - as it's just a piece of wire getting hot but yours were so it has to be the switch.

The switch still doesnt explain why the filament bulbs dont work with neg center post.
The switches primary function, regardless of any other function, only makes or breaks the power supply.

The only thing I can think for the switch being so large is it MAY have a stepdown converter within to supply 12v bulbs directly from a 230v supply.
Clutching at straws maybe.

 

[TheBig1]

or a diode in the switch? that way you cant reverse the polarity

 

[pappajohn]

Did you meter the wires at the holders when you reversed the choc block.

You may have inadvertantly nipped the terminal screw onto the pvc insulation instead of the copper conductor.
A very easy mistake....I know, I do it often on house wiring.

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[DBK]

If you reversed the wires going to the light unit and now the standard bulbs don't work any more then I suspect you have burned out something by reversing the polarity.

Not sure how that takes things forward other than it seems you have probably goosed something.

 

[pappajohn]

or a diode in the switch? that way you cant reverse the polarity

Makes sense, but why fit a diode when filament bulbs are polarity sensitive.
And a 10a diode is no bigger than a fag butt.

 

[TheBig1]

Makes sense, but why fit a diode when filament bulbs are polarity sensitive.

the switch may be a multi use one, not just used in motorhomes but also in controlled environments where the chassis of the light must not go live

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