9N Burnt Coil # 2 in a week

Scott Sherman · May 10, 2012

Keep burning out the coils and balist resistors, new 12v conversion. Help.. Have replaced all elec. components

souNdguy · May 10, 2012

12v will require:

oem coil + oem ballast resistor + additional resistor to bring primary current down into the 3-4a range.

or

newer 2.5 ohm or so '12v' coil + oem ballast resistor.

Jerry/MT · May 10, 2012

More resistance! Go to the Ford N forum. JMOR and Bruce(VA) can help you.

Scott Sherman · May 11, 2012

i put in a new balist resistor and a new ceramic resistor and new 12v coil front mount 9n. the creamic inline resistor smoked and burnt and then burnt the new balist resistor and coil. ALL new parts from here. This is the second time. With this all hooked up corretly, it wont start due to no power at the coil. Ard 1.5 volts. After bypassing the ceramic resistor, i get 12 volts to the coild and it runs for about 10 minutes and then dies, (burnt up coil)

souNdguy · May 11, 2012

you didn't mention amperage readings in any of your posts.

'ceramic' resistor? what value.. they make nearly all values..

too high and no spark.. too low and everything burns up...

buickanddeere · May 13, 2012

Of course it quit running in 10 minutes. Applying 13.8V to a 4V or 6V coil will do that.
Coil may say 12V but it's intended for a 12V system with a ballast resistor.
Measure the "12" volt coil's primary resistance, some are actually 6V coils.
So may people rush out there with a 12V single wire alternator and think they are going to enjoy a better and trouble free existence.

John B. · May 17, 2012

What was wrong with the old 6 volt system?

9N Burnt Coil # 2 in a week

Scott Sherman

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souNdguy

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Jerry/MT

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Scott Sherman

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souNdguy

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buickanddeere

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John B.

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