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Starter engaged warning light

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jpoint(at)wi.rr.com
Guest

Posted: Tue Apr 11, 2017 7:30 pm Post subject: Starter engaged warning light

Bob and fellow listers,



My starter solenoid (B&C) is not the type with a post for a starter 

engaged warning light.  It seems to me that I could simply run a wire 

from the starter side of the solenoid to a warning lamp with no issues.  

Once energized, the starter would draw it's large current and the lamp 

it's very small current.  Is it that simple of am I missing something?



Thanks



Jeff Point

Milwaukee

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Tim Olson

Joined: 25 Jan 2007
Posts: 2871

Posted: Tue Apr 11, 2017 8:24 pm Post subject: Starter engaged warning light

Hey Jeff,



I'm not 100% sure on this but I think I've seen a cutaway photo showing 

that the

"I" terminal on the other type of solenoid is actually connected 

internally to the same

basic spot as  the big terminal is.  So I would think it would work just 

fine.

I can't think of any real reason not to do it, as long as the main 

terminal is secure

and has enough exposed threads with an added ring terminal there, and I bet

it will fit fine.  I did put the starter engaged light on my -14, but I 

have the

regular Van's solenoid.



Mine is like the second one on page 6.



http://verticalpower.com/_documents/_pdf/contactor_wiring.pdf



I'm guessing that the reason they even added the terminal is for

simplicity in wiring those smaller wire ends to the solenoid without needing

a large ring terminal.



Tim

Up NorthWest of you

On 4/11/2017 10:27 PM, Jeff Point wrote:

 	  Quote: 	
		   



 Bob and fellow listers,



 My starter solenoid (B&C) is not the type with a post for a starter 

 engaged warning light.  It seems to me that I could simply run a wire 

 from the starter side of the solenoid to a warning lamp with no 

 issues.  Once energized, the starter would draw it's large current and 

 the lamp it's very small current.  Is it that simple of am I missing 

 something?



 Thanks



 Jeff Point

 Milwaukee

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Apr 12, 2017 1:37 am Post subject: Starter engaged warning light

At 11:21 PM 4/11/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Tim Olson <Tim(at)MyRV10.com>



 Hey Jeff,



 I'm not 100% sure on this but I think I've seen a cutaway photo showing that the

 "I" terminal on the other type of solenoid is actually connected internally to the same

 basic spot as  the big terminal is.  So I would think it would work just fine. 	


    Correct . . .



  	  Quote: 	
		  I'm guessing that the reason they even added the terminal is for

 simplicity in wiring those smaller wire ends to the solenoid without needing

 a large ring terminal. 	


   Actually, the "I" terminal is a holdover from

   the early days of the transition from 6 to 12

   volt cars. It was deduced that the original

   6v Kettering type ignition coil could be

   retained if one simply added a resistor in

   series with the coil . . . the added source

   resistance REDUCES coil charging time and

   you got better performance at higher RPM.

   

   A further benefit was realized by adding

   the "I" for ignition terminal to the starter

   contactor. This was used to bypass the coil

   resistor increased spark energy at low

   RPM of engine cranking. You can see the

   full disclosure of the 3-terminal starter

   contactors here:



 [img]cid:.0[/img]



   All three 'floating' terminals of the

   power path through the contactor get connected

   together simultaneously with the motion of

   "B" against "A" as suggested by the schematic

   below.



   



 

   Fully floating contacts were necessary to achieve

   design goals for the automotive world . . . and

   they're handy for our purposes 60 years later to

   drive a light bulb . . . but the same goal can be

   achieved by attaching driving the light directly

   from the starter motor's power input terminal.



   Don't forget to fuse the wire at the starter

   end if driving a lamp . . . or you could put

   the LED's current limiting resistor in series

   with the wire at the starter end and eliminate

   the fuse . . . the resistor will protect the

   shorted wire.

  	  Quote: 	
		   	
 

 

   Bob . . .

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jpoint(at)wi.rr.com
Guest

Posted: Wed Apr 12, 2017 2:55 pm Post subject: Starter engaged warning light

Thanks Bob (and others) for the detailed explanation confirming what I 

thought.  Protecting this run of 22ga wire seems like a perfect job for 

a fusible link, and since I have some 26ga left over from the Ray Allen 

servos, I will make one.  The panel LED has a resistor built in so that 

option is not available.



Jeff



On 4/12/17 4:25 AM, Robert L. Nuckolls, III wrote:

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