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John Deere Tractors Discussion Forum
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JD 320 Ignition question

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WilliamRis

07-21-2021 19:16:56




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Have currently started working on 320 JD hasn't ran for 5 yrs. replacing coil need to know which way coil gets wired seeing as this is a positive ground system?? Any help would be appreciated




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John T

07-22-2021 04:05:35




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 Re: JD 320 Ignition question in reply to WilliamRis, 07-21-2021 19:16:56  
I agree with the other fine gents IFFFFFFFF its still the original positive ground ?? - coil terminal receives voltage from the ignition switch being ON while its other + wires to the distributor where it gets its POS ground when the points are closed..

Often a bad coil is one of the last reasons for no spark while burned corroded oxide covered or pitted points are the leading cause. In case you haven't already diagnosed the cause of no spark or checked the points here's a Troubleshooting Procedure

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=5745

John T

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James Howell

07-22-2021 02:44:38




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 Re: JD 320 Ignition question in reply to WilliamRis, 07-21-2021 19:16:56  
Take a look at the photo below.

Hope this helps.



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old

07-21-2021 19:26:31




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 Re: JD 320 Ignition question in reply to WilliamRis, 07-21-2021 19:16:56  
Why are you replacing the coil?? Is it because you have no spark?? If yes then your likely to be wasting your time and $$$. I'd bet you need to clean and or replace the points not the coil



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Jim.ME

07-21-2021 19:20:45




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 Re: JD 320 Ignition question in reply to WilliamRis, 07-21-2021 19:16:56  
Quoting Removed, click Modern View to see

The + terminal of the distributor goes to the points (matching the system ground).



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