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Starter Solonoid

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speckter(at)comcast.net
Guest

Posted: Fri Oct 19, 2007 6:11 am Post subject: Starter Solonoid

OK all you electrical gurus.  I have two starter solonoids from Spruce that

have the two big terminals on each side and two small terminals in the

middle.  Neither will activate when I apply 12V across the two small

terminals.  In checking resistance I get an open  (infinity) between all of

the terminals.  I would expect a measured resistance between the two small

terminals and an open between the large terminals until activated.



Any suggestions, I thought I was a faulty unit but I bought these about two

years apart and both act the same.  Spruce has no info and gave me the

manufacturer that made it, but they too don't have any info they import it

and it has no wiring info with it.



Gary

40274

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Tim Olson

Joined: 25 Jan 2007
Posts: 2881

Posted: Fri Oct 19, 2007 6:38 am Post subject: Starter Solonoid

I think you may find that you'll have your resistance from

a terminal to the case of the solenoid.



You may want to peruse the Aeroelectric site a bit and perhaps

the Van's wiring plans.  It's been a while but I think one of

those small terminal is basically just a switch closure that will

be used for an indicator to show the contacts are closed.

I don't think you'll want to put power to that one when it's

closed or you may short something.  Attached is a diagram that

should help perhaps, depending on your solenoid.



Tim Olson - RV-10 N104CD - Flying



gary wrote:

 	  Quote: 	
		   

 

 OK all you electrical gurus.  I have two starter solonoids from Spruce that

 have the two big terminals on each side and two small terminals in the

 middle.  Neither will activate when I apply 12V across the two small

 terminals.  In checking resistance I get an open  (infinity) between all of

 the terminals.  I would expect a measured resistance between the two small

 terminals and an open between the large terminals until activated.

 

 Any suggestions, I thought I was a faulty unit but I bought these about two

 years apart and both act the same.  Spruce has no info and gave me the

 manufacturer that made it, but they too don't have any info they import it

 and it has no wiring info with it.

 

 Gary

 40274

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Starter_Contactor.pdf

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Starter_Contactor.pdf

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Jack.Phillips(at)cardinal
Guest

Posted: Fri Oct 19, 2007 6:52 am Post subject: Starter Solonoid

Check out the Tony Bingelis book "Firewall Forward".  It should have

what you need.  Or you can look at some of Tony's articles under

Homebuilders Headquarters on the EAA website.  Here is a link to an

article with a schematic that looks like it will serve:

http://members.eaa.org/home/homebuilders/building/electrical/Developing%

20Your%20Electrical%20System%20Part%202.html#TopOfPage

It shows the starter contactor with the 12 v line from the battery going

to one of the big lugs, a heavy cable going from the other big lug to

the starter, and the starter switch going to one of the little

terminals.  The other litle terminal should connect to your starter to

operate the "Bendix".  My understanding (which is highly open to

question), is that the way the solenoid works, the starter switch

connects the 12 v current to ground through the coil of the solenoid,

energizing the electromagnet and activating the contactor.  So to get

the coil to activate, you need +12V connected to one of the big lugs,

and GND connected to the little lug .  At that time, you should see

essentially zero resistance between the two big lugs.



Since you've got two of them, give it a try.  If you burn one up, you've

still got a spare.



Jack Phillips

Raleigh, NC

#40610

Tailcone complete - waiting on funding to proceed with QB kit



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bcondrey

Joined: 03 Apr 2006
Posts: 580

Posted: Fri Oct 19, 2007 7:06 am Post subject: Starter Solonoid

Gary,



The starter solenoid doesn't work like the master.  The coil is

connected between the "S" terminal and ground - just apply 12v to the

"S" terminal to engage.  The "I" terminal can be used a couple of

different ways - one common way is to indicate that the starter solenoid

is engaged and drive a light with it (+12v when engaged).



Bob



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pitts_pilot(at)bellsouth.
Guest

Posted: Fri Oct 19, 2007 9:53 am Post subject: Starter Solonoid

I hate it when that happens!!!  I've seen some 4 terminal solenoids that 

used only one of the small terminals and used the case for ground.  The 

second small terminal isn't tied to anything!  Probably has to do with 

using one case style for both one and two terminal (or 3/4 if you will) 

to cut down on inventory.



Good luck!

Linn

gary wrote:



 	  Quote: 	
		  



OK all you electrical gurus.  I have two starter solonoids from Spruce that

have the two big terminals on each side and two small terminals in the

middle.  Neither will activate when I apply 12V across the two small

terminals.  In checking resistance I get an open  (infinity) between all of

the terminals.  I would expect a measured resistance between the two small

terminals and an open between the large terminals until activated.



Any suggestions, I thought I was a faulty unit but I bought these about two

years apart and both act the same.  Spruce has no info and gave me the

manufacturer that made it, but they too don't have any info they import it

and it has no wiring info with it.



Gary

40274

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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speckter(at)comcast.net
Guest

Posted: Fri Oct 19, 2007 12:41 pm Post subject: Starter Solonoid

Thanks for all the responses.  Since my unit is plastic with a metal bracket

for mounting, I totally overlooked the mounting bracket as one of the legs

of the contactor coil.  Got it now, Thanks all.



Gary



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