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Alternator wiring

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doramsey(at)gmail.com
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Posted: Fri Oct 21, 2011 12:26 pm Post subject: Alternator wiring

I have a 24 volt 100 amp alternator that I am wiring  up.  I have 5 connections on the alternator.  One is the B lead and I know what to do with that.   The other terminals seem straight forward until I look at the wiring diagram options for the B&CLR3C-28 controller.   The other terminals are labelled F1, F2, GRD and Aux.    On the B&C wiring diagram, my alterator is not shown but they show a prestolite alternator that has terminals F1 and F2 with F1 getting wired to the field and F2 getting wired to either the engine or alternator case as a ground.   So I have a question about the grounding, is my continental alternator like the prestolite....do I ground the F2 terminal and do I also ground the ground terminal?,  and if so what is the current basis I should use for ground wire sizing?.   Its difficult for me to see why these grounds are needed on an alternator that is bolted to the engine with four substantial bolts.. seems like the grounds could have been wired up internally in their design but guess that was too much work for them.   By comparison my back up alternator which is a B&C SD-20 which has no ground terminals at all.  Now that makes sense.  On the SD-20 there are two field terminals that get pigtailed together.   That just confused me more.  One alternator the two F connections get pigtailed and others have one grounded and one connected to the field.  I am sure this is logical to someone but just not to me.  [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Fri Oct 21, 2011 10:00 pm Post subject: Alternator wiring

At 03:17 PM 10/21/2011, you wrote:

I have a 24 volt 100 amp alternator that I am wiring  up.  I have 5 

connections on the alternator.  One is the B lead and I know what to 

do with that.   The other terminals seem straight forward until I 

look at the wiring diagram options for the B&CLR3C-28 

controller.   The other terminals are labelled F1, F2, GRD and 

Aux.    On the B&C wiring diagram, my alterator is not shown but they 

show a prestolite alternator that has terminals F1 and F2 with F1 

getting wired to the field and F2 getting wired to either the engine 

or alternator case as a ground.   So I have a question about the 

grounding, is my continental alternator like the prestolite....do I 

ground the F2 terminal and do I also ground the ground terminal?,

   No, the alternator gets grounded through

   it's mounting hardware. Ignore the Aux

   terminal.



   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Oct 21, 2011 10:01 pm Post subject: Alternator wiring

 	  Quote: 	
		     By comparison my back up alternator which is a B&C SD-20 which 

 has no ground terminals at all.  Now that makes sense.  On the 

 SD-20 there are two field terminals that get pigtailed 

 together.   That just confused me more.


	


    They're redundant. Wiring to either or both will function.



 	  Quote: 	
		     One alternator the two F connections get pigtailed and others 

 have one grounded and one connected to the field.  I am sure this 

 is logical to someone but just not to me.


	


    . . . it was B&C's choice to parallel the two

    leads when the internal regulator was removed.



        Bob . . .

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    < show me where I'm wrong.      >

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