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How do I prevent starter engaged LED from failing?

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bob.verwey(at)gmail.com
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Posted: Sun May 04, 2014 9:09 pm Post subject: How do I prevent starter engaged LED from failing?

I have had an LED indicate "Gear in transit" for 10 years with no protection....

Best...  

Bob Verwey



 



On 3 May 2014 23:02, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:

[quote]  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 Eric,

 I am not knowledgeable enough about the characteristics of a starter motor to answer.  In my circuit, any diode, zener or not, will short out a negative voltage.  A 16 volt zener will short out any positive voltage above 16. Attach your latest circuit idea for others to comment on.

     It would be interesting to learn more about starters, any induced voltages during normal operations and also the voltage output and current capabilities of a starter that remains engaged with the engine after starting.

   Joe

 

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 Joe Gores

 

 

 

 

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eschlanser

Joined: 08 Apr 2010
Posts: 60

Posted: Mon May 05, 2014 2:48 pm Post subject: Re: How do I prevent starter engaged LED from failing?

Joe and Bob, 



I thought that an LED was a type of diode. It seems like one should not have to stick a second diode on the circuit when using an LED.  



For your review, here is an attachment of my solution. My engine/starter is in a state of storage so the LED based circuit cannot be tested yet. I chickened out and replaced the diode with a mini bulb. Seemed like the simplest way in my case.



Thank you,

Eric Schlanser

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starter warn light circuit3.pdf

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Tue May 06, 2014 2:59 am Post subject: Re: How do I prevent starter engaged LED from failing?

 	  Quote: 	
		  I thought that an LED was a type of diode. It seems like one should not have to stick a second diode on the circuit when using an LED. 	


I do not think that either Bob or I recommended using a protection diode.  I only offered a circuit containing one to help answer the question.  Actually, I think that an incandescent lamp is more likely to fail than a LED.

  I think an indicator light (if used) should be connected in parallel with the starter motor, and not connected to the contactor coil.  Then the lamp will illuminate whenever the starter motor is rotating and for whatever reason.  Someone correct me if I am wrong.

Joe

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