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D17 Points |
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Dean
Bronze Level Joined: 28 Nov 2009 Location: Dubuque, IA Points: 43 |
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Posted: 28 Nov 2009 at 7:35pm |
I have a 1958 D17 that seems to burn-up points. I have 12 volts at the distributor when the tractor is running, this seems odd to me. Should there be a restrictor in-line or in the coil to knock it down to 9 or 10 volts? I know my dad replaced the coil from an automotive store. Any help is appreciated. Thank you
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Brian Jasper co. Ia
Orange Level Joined: 11 Sep 2009 Location: Prairie City Ia Points: 10508 |
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If memory serves me correctly, you need a coil with 3-4 ohms resistance for 12V. You might look on the coil and see if it says to use a ballast resistor. For many years I used a 12V coil on my CA that was from a Kohler engine with battery ignition. The Kohler coil had the ballast resistor built in.
When you measure the primary voltage you will see battery voltage at the coil and should see about 6 to 8 volts on the dist side with the points closed. |
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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CTuckerNWIL
Orange Level Joined: 11 Sep 2009 Location: NW Illinois Points: 22823 |
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I would say if you have a 12v system with a 12v coil, you should have 12 volts at the coil. If you have a 12v system with a 6v coil, the coil will usually heat up and cause missing before it dies. Is the coil grounded the same as the battery? If you have a positive ground set up the + side of the coil should go to the distributor. If you have a negative ground, the neg side of the coil should go to the distributor.
Edited by CTuckerNWIL - 28 Nov 2009 at 8:07pm |
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
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Steve in NJ
Orange Level Access Joined: 12 Sep 2009 Location: Andover, NJ Points: 11883 |
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When running a 12V system with a 4 cylinder engine, you need 2.7-3.3 ohms of resistance in the Ignition circuit for the engine to run correctly and not burn up points. You can go to the local Auto Parts store and pick yourself up a 3.0 ohm coil. Make sure it has a built in resistor. That will put you smack in the middle of the ballpark. Renew the points, and you should be good to go. If you have a problem locating a coil, we have plenty of em' in stock..... HTH
Steve@B&B |
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Dean
Bronze Level Joined: 28 Nov 2009 Location: Dubuque, IA Points: 43 |
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Thanks Steve, that helps a lot!
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