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Why use starter contactor?

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bob(at)flyboybob.com
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Posted: Thu Jan 26, 2006 10:28 am Post subject: Why use starter contactor?

I am using Z-13/8 as a guide to wiring my electrical system and I do not

understand why it specifies a starter contactor.  The starter already has

one so it looks like increased part count which equals reduced relaibility.

I looked in the Connection and all I find is "Typical Starter Contactor

Wiring" on page 11-21.  There is no explanation of what function the starter

contactor serves.  The archives only gives three hits on "starter contactor"

and they do not answer the question:  What is the function of the starter

contacter listed in Z-13/8?



Regards,



Bob Lee

KR-2 N52BL

92% done only 53% to go!

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sportav8r(at)aol.com
Guest

Posted: Thu Jan 26, 2006 11:04 am Post subject: Why use starter contactor?

Bob: its function is to arouse your curiosity so that you'd eventually discover Z-22, and eliminate the extra contactor from your plans; at least, that's what it did for me <g>.  Not all starters have these, just the PM types like Sky-Tec.

 

-Bill B

 

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nuckollsr(at)cox.net
Guest

Posted: Thu Jan 26, 2006 11:10 am Post subject: Why use starter contactor?

At 01:32 PM 1/26/2006 -0500, you wrote:



 	  Quote: 	
		  



I am using Z-13/8 as a guide to wiring my electrical system and I do not

understand why it specifies a starter contactor.  The starter already has

one so it looks like increased part count which equals reduced relaibility.

I looked in the Connection and all I find is "Typical Starter Contactor

Wiring" on page 11-21.  There is no explanation of what function the starter

contactor serves.  The archives only gives three hits on "starter contactor"

and they do not answer the question:  What is the function of the starter

contacter listed in Z-13/8?


	


   See http://aeroelectric.com/articles/strtctr.pdf



   Bob . . .

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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sportav8r(at)aol.com
Guest

Posted: Thu Jan 26, 2006 12:51 pm Post subject: Why use starter contactor?

I'm planning to buffer my starter switch, wired per Z-22, through a 30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2), readily available, supports .25" fast-on terminal technology.  Any real downside to that?

 

-Bill

 

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nuckollsr(at)cox.net
Guest

Posted: Thu Jan 26, 2006 3:00 pm Post subject: Why use starter contactor?

At 03:50 PM 1/26/2006 -0500, you wrote:



 	  Quote: 	
		  



I'm planning to buffer my starter switch, wired per Z-22, through a 

30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2), 

readily available, supports .25" fast-on terminal technology.  Any real 

downside to that?



-Bill




	


    That will work too . . .



    Bob . . .

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klehman(at)albedo.net
Guest

Posted: Thu Jan 26, 2006 3:41 pm Post subject: Why use starter contactor?

I considered that and then went and bought a 25 amp marine key switch. 

 I wondered whether such a relay would actually increase the chance of 

the starter sticking on?? Most of them don't seem very robust for a 40 

amp rating and inductive loads?? Ken



sportav8r(at)aol.com wrote:



 	  Quote: 	
		  



I'm planning to buffer my starter switch, wired per Z-22, through a 30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2), readily available, supports .25" fast-on terminal technology.  Any real downside to that?

 

-Bill

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gmcjetpilot(at)yahoo.com
Guest

Posted: Fri Jan 27, 2006 4:09 am Post subject: Why use starter contactor?

>From: "Bob Lee" <bob(at)flyboybob.com>

 	  Quote: 	
		  Subject: Why use starter contactor? 

  >
	


  >The starter already has one so it looks like increased part count 

 	  Quote: 	
		  which equals reduced reliability. What is the function of the starter 

contactor listed in Z-13/8?

   
	


  There are heavy duty momentary push buttons that go from 15A to 

75A. Here are a couple of examples, 15 amp and 50 amp. I think 15 

amp switch would work, or go with the 50 amp switch or go with 

the small BOSCH relay as Bill sportav8r(at)aol.com suggested:

   

  http://www.philmore-datak.com/Page%20147.pdf

http://www.philmore-datak.com/EDS2.pdf

  

 

  SkyTec wire diagram with no firewall start contactor

http://www.skytecair.com/Wiring_diag.htm 

Note the catch diode.

   

  Leave the FW starter relay off, if you like, I did. The only down side is 

that 3-4 foot length of 2-4 AWG is hot all the time the master is on. I 

do not think it's an issue and chance of short or fire is small. If you 

get in a crash and the engine is ripped off, I don't think the battery 

cable will be you only problem. George

   

		

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

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sportav8r(at)aol.com
Guest

Posted: Fri Jan 27, 2006 8:01 am Post subject: Why use starter contactor?

I don't think the hot wire to the starter is to worry about, since it is controllable via the battery contactor in event of smelling smoke... not perfect protection but at least control.

 

-Bill B 

 

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BigD(at)DaveMorris.com
Guest

Posted: Fri Jan 27, 2006 9:22 am Post subject: Why use starter contactor?

At 09:59 AM 1/27/2006, you wrote:

 	  Quote: 	
		  

If you

get in a crash and the engine is ripped off, I don't think the battery

cable will be you only problem. George




	


It may not be, but it could mean the difference between walking away doused 

in gasoline, and walking away on fire, hoping somebody can get to you 

quickly enough to put out the flames.



This happened to a friend of mine who would have walked away from a crash 

if it had not been for that one little spark.  I'm putting a starter 

contactor on the firewall to absolutely shut off any possibility of the fat 

wire going to the starter chafing against baffling material or anything 

else in the event the engine decides to leave its normal upright, and 

locked position.



What's a few bucks, guys?  My experience with this friend of mine has made 

me a believer in steel braided fuel hose, Earl's fittings, Nomex clothing, 

and a lot of other things that may cost a few dollars extra, but could 

avoid years of skin graft surgery.



Dave Morris

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