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Coils

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Jimmy

12-17-2000 19:50:28




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What IS the difference between an automotive coil and a garden tractor coil? Given that ther both 12V. Thanx fer yer help in advance.




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geo h

01-01-2001 05:59:43




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 Re: Coils in reply to Jimmy, 12-17-2000 19:50:28  
On my 18hp kohler i used a dual plug coil off my chevy berretta.It worked well for about 2 years,till this summer it died.although it diddnthave as strong a spark as it should of had.i believe it was because of the electronic ign.coil on the points system.geoh



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HWooden

12-21-2000 17:37:18




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 Re: Coils in reply to Jimmy, 12-17-2000 19:50:28  
A coil that dose not use a resistor will have a resistance value of 3-4 Ohms. A coil that uses a resistor will have a resistance value of 1.3-1.5 Ohms. The resistor used must have a resistance value of 1.3-1.5 Ohms. Total primary resistance must not be less than 3 Ohms or points will burn.

System voltage must not drop below 9.6 volts while cranking. (measured at coil+)
HTH



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Rob.Fitterling

12-18-2000 20:04:20




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 Re: Coils in reply to Jimmy, 12-17-2000 19:50:28  
70's Kohlers used GM lookalike coils. When key is in start position I terminal on starter soleniod sends 12V to coil. when key is in run position key terminal sends 12V to drop resister that goes to coil at 6 to 10V. Lesser volts equal longer point life. I've been told condencer has to be sized to load, and know one can tell me how. I've converted fly wheel ignitions to external 12V coil ignitions using existing points and condencer with no points melt down. If resister is in coil then key switch to coil terminal is all you can do. wireing diagram should show witch one you have.

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Lou

12-18-2000 13:22:22




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 Re: Coils in reply to Jimmy, 12-17-2000 19:50:28  
At one time, many 12 v.American cars used 6 volt coils with a resistor in series to drop the 12v. to 6v. Then, when you activated the starter, the resistor would be shorted out so that the coil would get 12v. and give a hotter spark for starting, then go back to 6v. for running. No reason you can't use a car coil on a tractor if the coil is the right voltage. Be sure to use the right condenser for the coil.

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Rob.Fitterling

12-17-2000 21:09:28




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 Re: Coils in reply to Jimmy, 12-17-2000 19:50:28  
Ive used car coils on small motors be for.



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don

12-18-2000 07:52:42




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 Re: Re: Coils in reply to Rob.Fitterling, 12-17-2000 21:09:28  

i was told the kohler battery ignition coils have a built in resistor,,,don



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Rick

12-18-2000 14:17:41




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 Re: Re: Re: Coils in reply to don, 12-18-2000 07:52:42  
Don't Ford coils have a built in resister? And if so would that work on a garden tractor?



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Dan

12-20-2000 21:01:00




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 Re: Re: Re: Re: Coils in reply to Rick, 12-18-2000 14:17:41  
There seems to be a little confusion about condensers .

The purpose of the condenser or capacitor is to keep the points from arcing . If th condenser were to 'open' the points would burn up in no time . If it is too small (in Mfd) one side of the points will deposit on the other point --- If the condenser is too large (in Mfd ) the other point will have a deposit on it . The size of condenser is determined by the manufacturer to eliminate this pitting .

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