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John Deere Tractors Discussion Forum
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Re: whats burning my points?

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Author  [Modern View]

12-28-2012 08:27:47

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Most everything has been covered in one form or another but your problem is excess voltage. I ran a 430 on 12 volts but used a 12volt generator. Those mismatched systems have to be properly switched and regulated with an alternator but you have excess voltage to the points. A resistor block is needed and I would put it at the coil.

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12-28-2012 08:43:41

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 Re: whats burning my points? in reply to machinery-man, 12-28-2012 08:27:47  
A 3.0 to 3.5 ohm coil on 12V should limit primary current to 4 amp which is about max for points. An ammeter needs to be used to verify primary current. Or this guy is just going to continue ramdonly swapping connection and components. Is the distributed bushing work and affecting point gap? I'm also suspicious that the condensor/capacitor is open or under sized. Next question. Why convert a 40/420/430/440 gas to 12V ? They always started well if in tune.

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12-28-2012 10:08:17

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 Re: whats burning my points? in reply to buickanddeere, 12-28-2012 08:43:41  
Didn't convert it, bought it this way. I really appreciate all the info you guys are giving me, but I'm about 2 sets of points away from finding an original generator and brackets and putting it back the way it's a supposed to be. I agree with buickanddeere. My grandpas 430 has started fine for years on 6 volts, i'm just trying to work with what I have.

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12-28-2012 11:42:41

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 Re: whats burning my points? in reply to 430, 12-28-2012 10:08:17  
Did some knob wire the distributer so that the points short 12V to chassis instead of opening the 12V circuit through the coil?

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