Hi folks,
Don't have much electronics experience and have forgotten most of what I
learnt at school (well it was 25 years ago!) and am hoping I can find some
assistance in getting an LED lamp for my motorbike working correctly....
There is an aftermarket lamp made by Clear Alternatives that functions
correctly but has a very poorly designed LED board as far as vision is
concerned (very narrow beam and mis-aligned LEDs as well as poorly made
lamp
body).
I've made my own LED board and have found lots of resources on the web to
tell me what resistors to use with the LEDs to make the lamp function
correctly with the 14.4V my motorbike supplies the lamp. My problem has
arisen due to the fact that my BMW motorbike has a CanBus wiring system
that
has a bulb failure warning circuit. To get round this the aftermarket lamp
has a load resistor across each of the running and brake circuits -
fooling
the onboard system into thinking there's a standard 5/21W tungsten bulb
fitted.
When connected, my lamp functions correctly with lower level running light
and full level brake light and looks great. I guessed on the 100 ohms for
the running light but it looks about the same as the 5W tungsten to my
eyes.
If I take one of the aftermarket board load resistors and connect it
across
the brake circuit, the lamp still functions correctly and it fools the
warning system. However when I connect a 2nd load resistor across the
running light circuit the LEDs all go out!! I presume that as the LEDs are
already dim on the running light circuit, that they get too little current
when the load resistor is insterted and so go out.
What I need to know is what load resistors to use, and if necessary what
resistors to change on the actual lamp board so they can all work
together.
Even better, if someone were actually able to explain to me how it's
worked
out, I can learn something for the future too!
Here are the diagrams of the aftermarket lamp that works and my new home
built one for reference.
http://www.postimage.org/image.php?v=aV2gM5w9
http://www.postimage.org/image.php?v=Pq295j6A
Can anyone help me with the above or point me at any reference material,
online forums / guides on this that can help?
You'll make a very frustrated man happy!!
Cheers,
Lee
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