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Points

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R.Farrell

01-16-2002 15:14:15




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Are all points for tractors 12 volts unless you ask for 6 volt.




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Ron

01-16-2002 19:31:02




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 Re: Re: Points in reply to norm , 01-16-2002 18:48:58  
The points work off 6v, even on a 12v system.... A 12v system may START on 12v, but when you let up on the starter, it diverts the 12v thru a Ballast resister, to drop it to 6v. On my WD-45, I just have it start, and also run on the juice from the Ballast resister, and it starts fine.( I have a 12v battery in it ). I never did understand what a "12v" coil had that was any different from a 6v...!!! Anyone Know..?????

Ron.

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Bryan Smith

01-18-2002 13:42:32




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 Re: Re: Re: Points in reply to Ron, 01-16-2002 19:31:02  
Some early 12 volt coils (like a D15 Series II) had an internal ballast resistor. Later ones apparently did not. I suspect that the 12 volt coil *may* have about half the primary windings in it (it starts with twice as much voltage so would need 1/2 the windings for the same spark voltage), but maybe not.



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stephen

01-18-2002 20:52:58




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 Re: Re: Re: Re: Points in reply to Bryan Smith, 01-18-2002 13:42:32  
coils still come resitor and non resitor coils,a non resitor coil has to use a balast resitor to cut the voltage down to around 6v before it goes in the condensor . if a straight 12v went into the condensor it would last about 5min . running time. some vehicles used a resistence type wire to do the same job.but you cannot run a 12volt battey into a 6volt coil as it will smoke it.



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DJ

01-21-2002 10:23:13




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 Re: Re: Re: Re: Re: Points in reply to stephen, 01-18-2002 20:52:58  
I've never seen a coil burn up from 12 volts, but it sure burns the points fast.



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buckeye al

01-21-2002 14:26:11




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 Re: Re: Re: Re: Re: Re: Points in reply to DJ, 01-21-2002 10:23:13  
It happens DJ. Usually just the points go but I bought a JD 112 lawn tractor that ran like crap from a guy that was sick of its antics. Yup the points were smoked and even the spring that closes them had gotten so hot it no longer had any temper. After a new set of points it ran well but not for long. After 'bout 20 minutes it would just quit. No spark. Let it sit for 20 minutes & it would start right up & run fine ... for a while. The coil was bad and would get too hot to touch. End of the can was buldged out & the top was full of small cracks. I pulled it apart & there were nylon parts in there holding the windings and the pole piece. Heat had damaged them so that the nylon crumbled like a sand castle. The windings were still OK but internally the coil was disintegrating from its own weight & vibration. Had it been mounted on the engine it would probably have quit long ago. A new 6V. coil, new resistor and a second set of new points later and it runs fine.

Later.

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