Re: 12 volt Farmall H Spark Plugs

Posted by Bob M on June 20, 2005 at 06:44:06 from (151.190.254.106):

In Reply to: 12 volt Farmall H Spark Plugs posted by Ross L on June 20, 2005 at 06:12:45:

Ross - Spark plugs don't know (or care...) whether ignition primary is 6 or 12 volts.

With the lousy gasoline we get today the recommended plug for an H is the Champion D-21, AC C86, or other mfr's equivalent.

Note - Make sure you either have a "12 volt" coil or else a ballast resistor wired in series with the primary on the 6 volt coil on your H. Otherwise you will experience very short breaker point life and run the risk of overheating/burning out the coil.

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