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Delco-Remy ignition question

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Will-Texas

04-15-2002 16:31:35




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I just bought a late JD "A" with Delco-Remy 12 volt ignition. The coil looks to be a replacement 12 volt. It has a resister on the battery/switch side of the coil. Is this correct? PC675 doesn't show a resister.




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John T

04-16-2002 07:04:55




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 Re: Delco-Remy ignition question in reply to Will-Texas, 04-15-2002 16:31:35  
Will, the answer depends on FIRST is your coil a true 12 volt coil and SECOND if so, is it internally ballasted or require external ballast. (I ahve seen that printed right on sides of coils) Take an ohmmeter and measue the DC resistance between the little + and - terminals. Most 6 volt coils are around 1.2 ohms while most 12 volters are 1.5 ohms or higher. (In general, I have seen variances dependign on systems and manufacturers) Accordign to Gennesse Electronics literature, you need between 2.7 to 3.3 ohms total (coil + any ballast) in series with teh points to limit point current to avoid premature burn out in a 12 volt system. The factory wirign diagram for a late model A does not show a ballast, which tells me it used a 12 volt coil that had an internal ballast. Perhaps that tractors original coil went bad and was replaced with a 12 volter that required teh external ballast??? Anyway, a coil ohm check will answer yur question, and if the coil is only 1.5 ohms or so, I would let the ballast remain, but if it measures like 2.7 to 3.3 then remove that ballast. Let us know Ol John T in Indiana

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scott AR

04-15-2002 20:26:27




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 Re: Delco-Remy ignition question in reply to Will-Texas, 04-15-2002 16:31:35  
The 12 volt coils are available as resistor which does not need an external resistor, or as non resistor which needs an external resistor. If you can't tell which one it is, and it starts good with the external resistor, I would leave it on there. If you don't have enough resistor, your points will arc to death in about an hours running.



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Clooney

04-15-2002 16:45:20




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 Re: Delco-Remy ignition question in reply to Will-Texas, 04-15-2002 16:31:35  
Will, if it is a 12 volt coil (for sure) it probably doesn't need the resistor. If it is a 6 volt coil, it should have the ballast (dropping) resistor.
~If you have a volt meter, check the running voltage on the point side of the coil while it is running (should be 6-9 volts), if it is lower you probably should remove the resistor. ~Remove the resistor & measure the running voltage, if it is 10 or more you probably need the resistor..... . Note: you might need to use an analog meter as some digital VOM's won't keep up & average the voltage.

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Will-Texas

04-15-2002 18:20:04




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 Re: Re: Delco-Remy ignition question in reply to Clooney, 04-15-2002 16:45:20  
Thanks Clooney, I have an analog meter and will check it tomorrow.



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