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Starter Solonoid

 
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speckter(at)comcast.net
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PostPosted: Fri Oct 19, 2007 6:11 am    Post subject: Starter Solonoid Reply with 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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Tim Olson



Joined: 25 Jan 2007
Posts: 2881

PostPosted: Fri Oct 19, 2007 6:38 am    Post subject: Starter Solonoid Reply with quote

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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Jack.Phillips(at)cardinal
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PostPosted: Fri Oct 19, 2007 6:52 am    Post subject: Starter Solonoid Reply with quote

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

PostPosted: Fri Oct 19, 2007 7:06 am    Post subject: Starter Solonoid Reply with quote

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.
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PostPosted: Fri Oct 19, 2007 9:53 am    Post subject: Starter Solonoid Reply with quote

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




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speckter(at)comcast.net
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PostPosted: Fri Oct 19, 2007 12:41 pm    Post subject: Starter Solonoid Reply with quote

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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