Message text written by "Barahona Alonso, Francisco Javier"
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The diode (LED) is a current limited device. Use the 480 ohm resistor
otherwise you will cook the diode. Some LEDs can tolerate higher currents
than others. As the voltage drop across an LED is small, about 2 volts (it
varies with different colour outputs) selection of the series resistor can
be calculated by assuming there is 10v across it. Don't run it too close to
its current limit to improve reliability. The last few mA does not give
much extra brightness anyway. There was some talk that the Rotax regulator
needs to see a minimum load for the warning light so you may find that if
you particularly wish to use an LED you might need to put a resistor in
parallel to increase the load.
Nigel Charles
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