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Starter Cable and Engine Ground

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Sat Oct 10, 2009 11:16 am Post subject: Starter Cable and Engine Ground

Hello 



In the Z diagrams that I’ve seen, Bob shows wiring from the battery positive to the master contactor, then to the starter contactor. Some people wire directly from the battery positive terminal to the starter contactor instead, then to the master contactor. This seems like it would provide more juice to the starter and eliminate a short section of heavy cable. Is there a disadvantage to doing this?



And I understand it is best to ground everything to a common ground block on the firewall. Jabiru suggests grounding the starter case to the negative battery terminal. I would instead run this starter ground to the firewall ground block. Would this take the place of a separate engine block ground called out in the Z diagrams? If not, then where on a Jabiru 3300 would I connect for this ground?  I would also have ground cable between the battery and firewall ground block. 



Attached are pics from the Jabiru manual and service bulletin.

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Jabiru Starter Ground.JPG

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Jabiru Starter Contactor and Battery.JPG

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Jabiru Starter Contactor and Battery.JPG

_________________
Dan

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 10, 2009 12:41 pm Post subject: Starter Cable and Engine Ground

At 02:16 PM 10/10/2009, you wrote:

 	  Quote: 	
		  



Hello 



In the Z diagrams that I’ve seen, Bob shows 

wiring from the battery positive to the master 

contactor, then to the starter contactor. Some 

people wire directly from the battery positive 

terminal to the starter contactor instead, then 

to the master contactor. This seems like it 

would provide more juice to the starter and 

eliminate a short section of heavy cable. Is 

there a disadvantage to doing this?


	


   If the starter contactor or starter switch

   sticks, there's no way to shut down a runaway

   starter.

 	  Quote: 	
		  And I understand it is best to ground everything 

to a common ground block on the firewall. Jabiru 

suggests grounding the starter case to the 

negative battery terminal. I would instead run 

this starter ground to the firewall ground 

block. Would this take the place of a separate 

engine block ground called out in the Z 

diagrams? If not, then where on a Jabiru 3300 

would I connect for this ground?  I would also 

have ground cable between the battery and firewall ground block.


	


   The z-figures are a product of many years refinement

   tailored to the single-engine light aircraft but are

   not "carved in stone". What you propose would work.

   One suitable conductor between the crankcase and central

   point ground is sufficient.

        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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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Sat Oct 10, 2009 4:35 pm Post subject: Re: Starter Cable and Engine Ground

 	  Quote: 	
		  If the starter contactor or starter switch 

sticks, there's no way to shut down a runaway 

starter. 	




Doh! I knew it must have been something simple I'd overlooked.



 	  Quote: 	
		  One suitable conductor between the crankcase and central 

point ground is sufficient. 	




Goodie!



Thanks,

Dan

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