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Resistor Instead of Fusible Link?

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Dennis Johnson

Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.

Posted: Mon Mar 13, 2006 5:00 pm Post subject: Resistor Instead of Fusible Link?

Greetings,



I've been planning to use fusible links as Bob suggests to protect skinny wires leading to warning lights.  For example,  I'll have a "Starter Engaged" warning light connected to the starter relay and need something to protect the 22 AWG wire that goes to the warning light.



However, since the warning light will be an LED, and since the LED requires a dropping resistor, can I use the dropping resistor instead of the fusible link?  I would install the resistor at the same location I would have installed the fusible link.



The resistors I would use have solid wire leads on both ends.  How would I connect it to a starter relay without encountering problems from the vibration work-hardening the solid lead and causing it to break?  A couple of layer of heat shrink?  Put it a few inches downstream of the relay and secure it to nearby wires?



Thanks,

Dennis Johnson

Legacy (nearly finished with my wire book)

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nuckollsr(at)cox.net
Guest

Posted: Mon Mar 13, 2006 8:01 pm Post subject: Resistor Instead of Fusible Link?

At 04:52 PM 3/13/2006 -0800, you wrote:



 	  Quote: 	
		  

<pinetownd(at)volcano.net>



Greetings,



I've been planning to use fusible links as Bob suggests to protect skinny 

wires leading to warning lights.  For example,  I'll have a "Starter 

Engaged" warning light connected to the starter relay and need something 

to protect the 22 AWG wire that goes to the warning light.



However, since the warning light will be an LED, and since the LED 

requires a dropping resistor, can I use the dropping resistor instead of 

the fusible link?  I would install the resistor at the same location I 

would have installed the fusible link.


	


 	  Quote: 	
		  The resistors I would use have solid wire leads on both ends.  How would I 

connect it to a starter relay without encountering problems from the 

vibration work-hardening the solid lead and causing it to break?  A couple 

of layer of heat shrink?  Put it a few inches downstream of the relay and 

secure it to nearby wires?


	


    Good thinking. It's commonly done . . .



    See:



http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_1.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_2.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_3.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_4.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_5.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_6.jpg



    Note that LEDs are relatively fragile devices with respect

    to short reverse voltage transients. Suggest you add a 1N4001

    in parallel with an LED that's connected directly to high

    power, somewhat inductive gizmo like a starter motor.



    Bob . . .

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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Mon Mar 13, 2006 8:03 pm Post subject: Resistor Instead of Fusible Link?

In a message dated 03/13/2006 7:02:23 PM Central Standard Time, 

pinetownd(at)volcano.net writes:

However, since the warning light will be an LED, and since the LED requires a 

dropping resistor, can I use the dropping resistor instead of the fusible 

link?  I would install the resistor at the same location I would have installed 

the fusible link.

 	  Quote: 	
		  >>

Not to say this won't work, but just for kix&gigglz, why not take the 
	


resistor/wire/LED circuit you propose, rig it up to a fully charged battery, then 

short across the LED to simulate the feed wire going to ground.  This would be 

one way to test what you propose.  Please take appropriate measures to ensure 

personal safety and let us know the results...



Proof is hidden somewhere deep in the depths of pudding...



Mark do not archive



PS- I have a starter engaged LED on my annunciator, but chose to feed it with 

18 ga wire using a 22 ga fuselink at the starter contactor-

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_________________
From The PossumWorks...

Dennis Johnson

Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.

Posted: Tue Mar 14, 2006 3:38 pm Post subject: Re: Resistor Instead of Fusible Link?

 	  nuckollsr(at)cox.net wrote: 	
		  At 04:52 PM 3/13/2006 -0800, you wrote:



	


    Good thinking. It's commonly done . . .



    See:



http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_1.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_2.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_3.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_4.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_5.jpg

http://www.aeroelectric.com/articles/In_Line_Resistor/In_Line_Resistor_6.jpg



    Note that LEDs are relatively fragile devices with respect

    to short reverse voltage transients. Suggest you add a 1N4001

    in parallel with an LED that's connected directly to high

    power, somewhat inductive gizmo like a starter motor.



    Bob . . .[/quote]



Hi Bob,



Thanks for such a thorough reply!  That's what I'll do, plus I'll add the rectifier diode as you showed.



Thanks,

Dennis Johnson



do not archive

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