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Alternator Field Failure?

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farmrjohn

Joined: 31 Dec 2018
Posts: 54

Posted: Sun Jan 02, 2022 5:37 pm Post subject: Alternator Field Failure?

I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 Rev. A regulator.  On my last flight charging to the bus/battery stopped.  After replacing the regulator with a know good one and still no charging I started to follow the Zeftronic installation/trouble shooting instructions.  Checking the resistance for the field resulted in infinite resistance from the field terminal to ground whereas the instructions indicated 3.5-6 ohm is normal resistance.  I'm assuming this would indicate a break in the field wiring and hence no charging or could the problem be something else?. If so, is this repairable?  Are there alternative alternators (certificated airplane) if replacement is necessary?  Thanks, John

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Jan 02, 2022 7:20 pm Post subject: Alternator Field Failure?

At 07:37 PM 1/2/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "farmrjohn" <faithvineyard(at)yahoo.com>



 I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 Rev. A regulator.  On my last flight charging to the bus/battery stopped.  After replacing the regulator with a know good one and still no charging I started to follow the Zeftronic installation/trouble shooting instructions.  Checking the resistance for the field resulted in infinite resistance from the field terminal to ground whereas the instructions indicated 3.5-6 ohm is normal resistance.  I'm assuming this would indicate a break in the field wiring and hence no charging or could the problem be something else?. If so, is this repairable?  Are there alternative alternators (certificated airplane) if replacement is necessary?  Thanks, John



 	


   There are carbon brushes that ride on slip

   rings to conduct output from the regulator to

   the moving field coil. These are a service-life

   limited part . . . they wear out.



   Since this is a TC aircraft, regs require

   service by a 'qualified' facility. But if

   you're adventuresome, you could disassemble

   it for inspection and see what the brushes

   look like.



   A spec-rebuilt alternator is breathtakingly

   expensive . . . over $1500



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 03, 2022 12:04 pm Post subject: Alternator Field Failure?

 	  Quote: 	
		    A spec-rebuilt alternator is breathtakingly

   expensive . . . over $1500 	


   What kind of airplane? How is it used?



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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skywagon185(at)gmail.com
Guest

Posted: Mon Jan 03, 2022 1:41 pm Post subject: Alternator Field Failure?

Hmmm....Isn't that TCM alternator essentially a Ford unit ...??.

I believe standard Ford parts will fix most anything in the unit.,Â 

I also suspect that if you took it to any alternatorÂ shop and said it was out of your boat or tractor, that they would go through it, test and replace parts for a fraction of the cost.

D

On Sun, Jan 2, 2022 at 7:22 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 07:37 PM 1/2/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "farmrjohn" <faithvineyard(at)yahoo.com (faithvineyard(at)yahoo.com)>



 I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 Rev. A regulator.Â  On my last flight charging to the bus/battery stopped.Â  After replacing the regulator with a know good one and still no charging I started to follow the Zeftronic installation/trouble shooting instructions.Â  Checking the resistance for the field resulted in infinite resistance from the field terminal to ground whereas the instructions indicated 3.5-6 ohm is normal resistance.Â  I'm assuming this would indicate a break in the field wiring and hence no charging or could the problem be something else?. If so, is this repairable?Â  Are there alternative alternators (certificated airplane) if replacement is necessary?Â  Thanks, John



 	


 Â  There are carbon brushes that ride on slip

 Â  rings to conduct output from the regulator to

 Â  the moving field coil. These are a service-life

 Â  limited part . . . they wear out.



 Â  Since this is a TC aircraft, regs require

 Â  service by a 'qualified' facility. But if

 Â  you're adventuresome, you could disassemble

 Â  it for inspection and see what the brushes

 Â  look like.



 Â  A spec-rebuilt alternator is breathtakingly

 Â  expensive . . . over $1500



 

 

 Â  Bob . . .



 Â  Un impeachable logic: George Carlin asked, "If black boxes

 Â  survive crashes, why don't they make the whole airplane

 Â  out of that stuff?"

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 03, 2022 4:00 pm Post subject: Alternator Field Failure?

At 03:40 PM 1/3/2022, you wrote:

  	  Quote: 	
		  Hmmm....

 Isn't that TCM alternator essentially a Ford unit ...??.

 I believe standard Ford parts will fix most anything in the unit.,Â 

 I also suspect that if you took it to any alternatorÂ shop and said it was out of your boat or tractor, that they would go through it, test and replace parts for a fraction of the cost.

  	
 

   That works sometimes . . . problem is that the front

   end bell obviously mates with an aircraft engine.

   Some folks have claimed that the engine was on

   an airboat. Or simply took bad parts from the

   afflicted device down to the local service facility

   in search of 'matches'.



   Some years ago a reader found the Lester number

   for a stock automotive alternator with the same

   internal guts as his TCM alternator. It was cheaper

   to buy a reman alternator over the counter to

   part out than to buy holy-watered parts.



   If the alternator in question DOES have worn

   out brushes, you may find suitable matches

   at an overhaul shop. Bearings are no big deal

   either . . . easily sourced from lots of places.



 



 



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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farmrjohn

Joined: 31 Dec 2018
Posts: 54

Posted: Mon Jan 03, 2022 6:52 pm Post subject: Re: Alternator Field Failure?

Thanks all.  My mechanic will be at the hangar on Wednesday.  The engine/alternator are on an Alon A2.  Is it necessary to pull the left magneto to remove the alternator?  I think we have a lead on a shop for an IRAN vs. replacement, although I wouldn't mind a lighter weight unit to save a pound or two.  John

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farmrjohn

Joined: 31 Dec 2018
Posts: 54

Posted: Mon Jan 03, 2022 8:13 pm Post subject: Re: Alternator Field Failure?

As an alternative it looks like Plane Power has an alternative via STC SA10921SC using the ER14-50 alternator.  That comes with its own regulator.  Would the Zeftronic R15V00 Rev. A work?

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Jan 04, 2022 9:31 am Post subject: Alternator Field Failure?

At 10:13 PM 1/3/2022, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "farmrjohn" <faithvineyard(at)yahoo.com>



 As an alternative it looks like Plane Power has an alternative via STC SA10921SC using the ER14-50 alternator.  That comes with its own regulator.  Would the Zeftronic R15V00 Rev. A work?

 	


    Yes



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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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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