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Ground Start enunciator light

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trigo(at)mail.telepac.pt
Guest

Posted: Sat Mar 15, 2008 5:59 pm Post subject: Ground Start enunciator light

Listers



I installed a Piper-type male socket to my airplane, to have the possibility

of a ground start in case of a low battery cranking difficulty.

As recommended by this List experts, I connected the socket to the battery

through a continuous duty contactor (aka Master Relay or Battery solenoid),

the S701-1 from B&C, controlled by a SPST switch, which grounds the

contactor when thrown to ON.



Now what I want to do is to put a green enunciator light in my panel, which

illuminates when that switch is ON and the contactor is closed to allow the

ground start procedure, to remind me to switch it Off after finishing that

procedure.



I have tried some wiring of the warning light to the switch, but I cannot

make it work properly. Can somebody please enlighten me how to wire it?



TIA

Carlos

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Mar 15, 2008 7:13 pm Post subject: Ground Start enunciator light

At 01:53 AM 3/16/2008 +0000, you wrote:



 	  Quote: 	
		  

<trigo(at)mail.telepac.pt>



Listers



I installed a Piper-type male socket to my airplane, to have the possibility

of a ground start in case of a low battery cranking difficulty.

As recommended by this List experts, I connected the socket to the battery

through a continuous duty contactor (aka Master Relay or Battery solenoid),

the S701-1 from B&C, controlled by a SPST switch, which grounds the

contactor when thrown to ON.



Now what I want to do is to put a green enunciator light in my panel, which

illuminates when that switch is ON and the contactor is closed to allow the

ground start procedure, to remind me to switch it Off after finishing that

procedure.



I have tried some wiring of the warning light to the switch, but I cannot

make it work properly. Can somebody please enlighten me how to wire it?


	


   The schematic is shown at:



http://www.aeroelectric.com/articles/grndpwr.pdf



        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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Schaefer(at)rts-services.
Guest

Posted: Sat Mar 15, 2008 7:13 pm Post subject: Ground Start enunciator light

You might also want to power the relay from the external power with a diode

to verify that the external power is of the right polarity.



r.t.s.



--

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trigo(at)mail.telepac.pt
Guest

Posted: Sun Mar 16, 2008 2:53 am Post subject: Ground Start enunciator light

Bob  

   

Thanks for pointing me to this schematic.  

   

I have 2 questions about this schematic:  

   

   - shouldn't the "Ground Power" contactor p/n be S701-1 instead of S702-1?  

     

   - regarding the lamp, if I want to put a simple 2 terminal lamp, instead of a ptt lamp, is the wiring the same?  

   

Carlos  

   

   

[quote] --

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