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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

starter field coil -- how to evaluate

Author  [Modern View]
jim_uny

12-01-2012 17:55:43
24.213.206.167



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how do you evaluate a field coil in a starter ?

what test and what tool ?




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John T

12-02-2012 07:32:10
216.249.82.117



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 Re: starter field coil -- how to evaluate in reply to jim_uny, 12-01-2012 17:55:43  
I cant say exactly, too many different gennys, and I agree with Teddy and Jimbo HOWEVER the sum of BOTH field coils in series Id expect maybe around 2 to 4 ohms of resistance buttttttt as Jim notes a cheap meter isnt accurate at such low resistance. Still in line with Teddys great advice, if they show EITHER an open circuit orrrrrrrrr theres any short path (very low ohms)to the case frame, they are BADDDDDDD. Thats all insulated wire remember so its NOT shorted to the case

NOTE the armature needs to be out of the circuit or the brushes lifted or insulated cuz otherwise about everyplace shows a dead short to case frame via the grounded brush well duhhhhhhh

While this simple low voltage test shows if they are bad it dont necessarily show they are good cuz once warmed up and at higher voltages thats when they can break down even if the 2 tests above indicates they are okay (continuous and not shorted to case)

Often theres a short or an open where the 2 splice in the middle.

John T

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Janicholson

12-02-2012 08:56:57
67.72.98.47



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 Re: starter field coil -- how to evaluate in reply to John T, 12-02-2012 07:32:10  
Hello John, It is a starter, not Genny But I almost read it that way too. Jim



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John T

12-02-2012 10:12:33
216.249.82.117



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 Re: starter field coil -- how to evaluate in reply to Janicholson, 12-02-2012 08:56:57  
OOPS silly me why was I thinkin starter hmmmmmmmmm lol fer sure about anything on a starter (series wound I guess) is gonna read very lowwwwwwwww ohms as its that big heavy copper wire. Thanks for the correction

John T



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Janicholson

12-01-2012 20:36:15
96.24.99.126



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 Re: starter field coil -- how to evaluate in reply to jim_uny, 12-01-2012 17:55:43  
Unless you have a very sensitive Ohm meter, you will only find zero resistance. It is probably .01 ohms or so. Teddy has the idea covered. Jim



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teddy52food

12-01-2012 18:02:51
184.94.175.179



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 Re: starter field coil -- how to evaluate in reply to jim_uny, 12-01-2012 17:55:43  
Use a test light to make sure it is not grounded to the case. Also make sure it has continuity. Insulation should be good , not falling apart. What is your problem?



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jim_uny

12-01-2012 21:02:12
24.213.206.167



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 Re: starter field coil -- how to evaluate in reply to teddy52food, 12-01-2012 18:02:51  
no problem. i just want to know if it is within specs or throw out. i live on hill in winter and want good crank. also is there a good tool to take out phillips head screw other than impact punch & big phillips on wratchet.



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Janicholson

12-01-2012 21:06:24
96.24.99.126



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 Re: starter field coil -- how to evaluate in reply to jim_uny, 12-01-2012 21:02:12  
Do not take it apart unless it is bad. The info below on the question of generator field poles is the same issue. Jim



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