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Restoration & Repair Tips Board

Re: Fires but won't run

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04-01-2013 12:03:27

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99.9% of engines that won't fire or stay lit have an ignition problem.
6V systems do not require an ignition resistor since the coil is designed for 6 volts. If a 6 volt system is converted to 12 volts and nothing else changed, it will not take too long before the coil and/or points and condenser burn out from too high voltage. An engine may fire when first cranked but will not remain running due to one of the components being burned out.

When converting from 6V to 12V, either a ballast resistor needs to be wired in series in the primary coil circuit or a 12V coil with integral resistance needs to be installed.

If a ballast resistor or 12V coil has already been installed, and the problem has now cropped up, trouble shooting via the internet would only be a guess.

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04-04-2013 16:57:30

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 Re: Fires but won't run in reply to forty40, 04-01-2013 12:03:27  
as a 'genera' statement, saying 6v systems do not require resistors, is incorrect.

ford 9n, 2n, and 8n using a front mount distribuitor are 6v oem, and have a coil AND ballast resistor.

just sayin...

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04-01-2013 17:53:40

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 Re: Fires but won't run in reply to forty40, 04-01-2013 12:03:27  
I put a 12 volt coil on it and on he side of the coil it says do not use with external resistor.

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