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How do I prevent starter engaged LED from failing?

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rparigoris

Joined: 24 Nov 2009
Posts: 792

Posted: Thu Mar 25, 2010 8:30 pm Post subject: How do I prevent starter engaged LED from failing?

I think I remember reading if an LED is used instead of a bulb for starter engagement indication, that you best add a diode to prevent the LED from getting hurt when power is removed from starter motor.



Where does the diode get placed, in series with the LED or in parallel? If answer is in parallel where would the dropping resistor for LED get placed, between the legs of the protection diode, or outside?



What would the specs be for a diode to protect my LED (reverse voltage rating and wattage)?



Could I use a Perihelion Snap-jack?



Install will be on my Rotax 914  which has a 12 volt starter motor of approx. .6kW and the LED is yellow and draws ~ 30mAs.



Thx.

Ron Parigoris

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