Stuart_B
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| posted on 5/8/08 at 04:54 PM |
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hella rear lights
hi all, i just got some second hand hella rear lights, but i do not know who to ire them, is there a wiring digram any where or has somebody got one
they could email me a scanned copy?
thanks
stuart
black mk indy, 1.6pinto on cbr600 bike carb's.
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Stuart_B
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| posted on 7/8/08 at 11:31 AM |
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help, they have led around them, does the way you connect them matter of will they just not work?
thanks
stuart
black mk indy, 1.6pinto on cbr600 bike carb's.
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Stuart_B
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| posted on 8/8/08 at 03:01 PM |
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anybody got this and can tell which one is postive and which is negative?
thanks
stuart
black mk indy, 1.6pinto on cbr600 bike carb's.
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David Jenkins
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| posted on 8/8/08 at 04:11 PM |
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I can hear the tumbleweed rustling across the dusty road... 
If it was mine, I'd get a resistor with a value around 470 - 680 ohms (these are common values) with a power rating of 1 watt. Maplins will
sell you one for an extortionate price, maybe as much as 25p. I would then solder 1 end of this to one of the lamp cluster leads.
Then I would connect the other end of the resistor to one of the battery terminals, and the other side of the lamp connection to the other terminal,
while watching the LEDs.
If it's connect it the right way around there will be a dismal glow from the LEDs - at this point I would note which lead went to the positive
terminal, and put some red tape around it, cos I got it right!
If I didn't see even a glimmer, then I would try it the other way around.
HOPEFULLY, it will be right when the resistor is taken away.
HTH,
David
P.S. You might like to wait until a few electronics experts pass comment on this before trying it out... but I think the idea's sound.
[Edited on 8/8/08 by David Jenkins]
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02GF74
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| posted on 9/8/08 at 08:41 PM |
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^^^^ yep the thrroy is sound but the resistor may be too high a value.
LEDs need about 2 V before they start to glow; if there is several LEDs in the lamp, each probably having their drop resistor, t hen a 560 ohm may
not be enough to turn them on.
can you post a photo of the connections?
can you remove the cover to see into one of the LEDs and follow the wiring?
If you look at a LED, then the semiconductor die sits on a cup and there a metal pin next to it.
The cup is the 0 V. if you can see that and follow the wires, you can then wire up the lamps correct first time.
let's see if I can find photo of what I am on about .....
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02GF74
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| posted on 9/8/08 at 08:46 PM |
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here you go:
they call it "anvil" - I callled it "cup".
cathode = negative or in your case 0 V.
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