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1850 oliver

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shane

05-06-2003 20:29:30




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I have an 1850 oliver that keeps burning up its points. It has a mallory distributor and a regular 12 volt truck coil on it. If any one might knows why please let me know.




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Ollie

05-07-2003 04:22:17




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 Re: 1850 oliver in reply to shane, 05-06-2003 20:29:30  
On some models Oliver buried the resistor in the wiring harness where you will never find it without a wiring diagram. So I looked it up in the I&T service manual for you. There is a white wire that runs from the started solenoid to the ignition switch "I" terminal. This is the resistor; it operates as a shunt. Oliver did not use a resistor hanging off the coil like cars and trucks did.

If you installed a coil marked "for use without external resistor", you'll go through a set of points in no time. You can either dig up the resistor and remove it (not needed anyway) or buy a coil marked "for use with external resistor only". The NAPA part # is IC64. All coils made today are marked one way or the other.

Or possibly the shunt is open. That happended to my 1650 which is wired like your 1850. When I rewired the entire tractor, I removed the shunt, installed the IC64 coil, and I honestly can't remember the last time I've replaced the points.

BTW, the purpose of the shunt is to provide a hotter spark during cranking to ease starting in cold weather. It's not needed. My 1650 starts instantly at -30F.

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Hal

05-07-2003 11:16:04




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 Re: Re: 1850 oliver in reply to Ollie, 05-07-2003 04:22:17  
Ollie-I think you have it backwards here about the resistor. If the coil is marked "for use without external resistor", and you have a resistor already built in the wiring it might not start or will run lousy because of weak spark but it should not cause the points to burn.
It is more likely what Craig said earlier; the coil might be one that requires and external resistor and maybe someone has altered or messed with the wiring and the coil is receiving the full 12 volts all of the time, not just for starting. Put a voltmeter across the coil with the points closed and ignition on; it should read much less than 12 volts (around 9??) if you are using the kind of coil that requires an external resistor.

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Hal

05-07-2003 11:26:09




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 Re: Re: Re: 1850 oliver in reply to Hal, 05-07-2003 11:16:04  
Sorry for the double posting. I was away from the computer for a few hours and when I hit the F5 key it posted again.



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Hal

05-07-2003 07:43:41




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 Re: Re: 1850 oliver in reply to Ollie, 05-07-2003 04:22:17  
Ollie-I think you have it backwards here about the resistor. If the coil is marked "for use without external resistor", and you have a resistor already built in the wiring it might not start or will run lousy because of weak spark but it should not cause the points to burn.
It is more likely what Craig said earlier; the coil might be one that requires and external resistor and maybe someone has altered or messed with the wiring and the coil is receiving the full 12 volts all of the time, not just for starting. Put a voltmeter across the coil with the points closed and ignition on; it should read much less than 12 volts (around 9??) if you are using the kind of coil that requires an external resistor.

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Craig

05-07-2003 03:05:27




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 Re: 1850 oliver in reply to shane, 05-06-2003 20:29:30  
I could be that the coil you are using needs an external resistor, with out one it's drawing too many amps. for the points, sometimes they are marked "for use with external resistor" or "internal resistor" most automotive coils use an external resistor in the hot lead and have a lead running from the "R" terminal on the starter to the coil side of the resistor to "boost" the spark when starting. My 1650,1900,1950 all have this "R" terminal on the starter but they are diesels and do not use them.
Craig

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Craig

05-07-2003 03:13:29




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 Re: Re: 1850 oliver in reply to Craig, 05-07-2003 03:05:27  
Sorry it' early here, my post should have started with It not I, for some resone when I hit my "back" button to correct mistakes there is no text, and I am just too lazy to redo the whole thing. You should be able to get a universal resistor at any auto parts store, be carful where you mount it as they get real hot and should be kept dry



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Farmer in the Dells (WI)

05-06-2003 20:43:38




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 Re: 1850 oliver in reply to shane, 05-06-2003 20:29:30  
I believe your condenser acts as a capacitor and buffers the points from being burned. I may be wrong, But I have seen this on earlier posts from other questions. Try replacing that and see if that helps. Let us know what you find out. Others will chime in and give you their 2 cents too. For what its worth, keep the change.



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