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Re: 1950 Ferguson TO20 has no spark

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09-26-2012 05:08:29

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If your getting fire to the coil that eliminates the switch,leaving the insulator to the distributor being shorted or either the condensor connector is touching ground.Is it a+ grd. or-?

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09-26-2012 16:25:44

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 Re: 1950 Ferguson TO20 has no spark in reply to 2tractors, 09-26-2012 05:08:29  
@2tractors: As stated in the first sentence of my original post, this is a 6 volt positive ground system. I also stated that the coil tower was not throwing a spark with the high voltage wire placed near the engine block, so no way that the ignition switch can be "eliminated." I did state that there was 6.3 volts present at the coil primary terminals and the distributor connector with the points open, but since voltage is constant in this type of circuitry (other than what should come out of the coil, which is a voltage step-up transformer) the indication of correct voltage being present at the coil and distributor does not mean very much, since you can have 6.3 volts but very little amperage present if there is a partial or full short somewhere in the system that is robbing amperage. As you suggested, the distributor connector insulation could be cracked, and thus robbing amps by partially or fully arcing to ground whenever the voltage rises in the coil's primary windings. Although I hadn't mentioned it in my first post, I had checked the insulator when checking all the tractor wiring for any possible grounds. Thanks for offering suggestions, though.

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09-27-2012 05:49:29

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 Re: 1950 Ferguson TO20 has no spark in reply to Rickoff, 09-26-2012 16:25:44  
My bad on not remembering your mentioning the 6V system at the beginning but in my defense it was a long post BUT there seems to be a flaw in your remedy of finding an amperage draw with the toggle switch which you stated checked out at ZERO ohms when on. An if there was a draw your cables would heat up and drain your battery.

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