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Re: 12 volt coil voltage

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Author  [Modern View]

12-20-2012 12:08:50

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Old, I checked the coil voltage as you suggested today. With the ignition on, I cranked the engine over by hand very slowly, and read the voltage thru three cycles of points opening and closing. The "closed" voltage varied from about 3 to 4.7 volts, and the "open points" voltage averaged between 11.5 to 11.7 volts.
Thanks, Tom

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12-20-2012 14:02:54

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 Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 12:08:50  
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Tom, I admit to being a bit puzzled by your 3-4.7 V points closed.You should read no voltage unless the points are dirty setting up a resistance.
The points are a ground point till they switch open. Unless the contact material contains some resistance.

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12-20-2012 14:20:53

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 Re: 12 volt coil voltage in reply to mEl, 12-20-2012 14:02:54  
Brand new points, and tractor is running great, so I guess I don't know either!

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12-20-2012 12:33:09

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 Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 12:08:50  
Ok when open that says you have battery volts or close as you should have. When closed you read voltage dropped across the coil and resister which again reads close to what you should. If you where to read it with out cranking it with the points open you should have read battery volts as in 12.3 or so but with you cranking it the voltage reading will be a bit less then battery volts due to starter draw. Same holds true as for the voltage with the point open. If you had check voltage by hand turning the engine you would have probably read 12.3 or so open and around 6 volts when closed but what you got says your just fine

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12-20-2012 14:25:08

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 Re: 12 volt coil voltage in reply to old, 12-20-2012 12:33:09  
Thanks for the input, guess I'll call it good!

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12-20-2012 14:32:29

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 Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 14:25:08  
Ya I would call it good. Ya if down the road you burn up point then maybe need to dig deeper but I'll bet you do not have any problems

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