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Re: 70 ign problem update

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gary in neb.

11-18-2013 08:50:38

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the resistor i have that i was gonna put on is 2.5 ohms. is that gonna be enough? stated right on the coil is "no external resistor required".

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John T

11-18-2013 13:22:36

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 Re: 70 ign problem update in reply to gary in neb., 11-18-2013 08:50:38  
"the resistor i have that i was gonna put on is 2.5 ohms. is that gonna be enough?"

For an ideal 50/50, 6volt/12volt voltage divider, the ballast resistance is the same as the coils LV Primary resistance. Typical of ballast resistors is say 1.25 to near 2 ohms. 2.5 sounds a bit high, but can work depending on the coils LV primary resistance. If the ballast ohms is too high the spark may be a tad weak, if to low the coil might run just a bit hot

"stated right on the coil is "no external resistor required"."

If its a 6 volt coil used on a 6 volt tractor THATS TRUE. If its a 6 volt tractor used on a 12 volt tractor THATS NOT TRUE. If its a 12 volt coil used on a 12 volt tractor THATS TRUE.

John T

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gary in neb.

11-18-2013 13:25:13

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 Re: 70 ign problem update in reply to John T, 11-18-2013 13:22:36  
thanks for the input. gonna put the resistor in and see what happens. hopefully i wont have to change the coil again in a couple of months.

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11-18-2013 10:03:56

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 Re: 70 ign problem update in reply to gary in neb., 11-18-2013 08:50:38  
Had same problem with my a coil from napa that says no external resistor required. Problem solved.

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Bob Harvey

11-18-2013 16:29:31

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 Re: 70 ign problem update in reply to jdman(mo), 11-18-2013 10:03:56  
Many moons ago when I got my '60'(1971), it didn't have a coil. I went to the local parts store and bought an inexpensive 12v 'Generic' coil. Sucker is till on there ! Thing was already -grnd.

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