[AT] Project Updates '49 A, '51 A, and '47 B (STEVE ALLEN)

[Jim Becker]

Most 12-volt systems (except DIY conversions) with a ballast resistor have a circuit to bypass the resistor while starting.  This compensates for any voltage pull down caused by the starter and provides a hotter spark for starting.

Jim Becker

From: Kurt Musgrave 
Sent: Monday, May 11, 2020 1:16 PM
To: 'Antique Tractor Email Discussion Group' 
Subject: Re: [AT] Project Updates '49 A, '51 A, and '47 B (STEVE ALLEN)

 

>>You are correct Carl.  A 12V system takes a 12V coil with an internal resistor or and external 1.4 ohm resistor commonly called a ballast resistor can be used with a 6V coil.    These are available at most auto parts stores.   This is to avoid burning the points as you say.<<

 

I never really understood why the ballast resistor, always seemed to me it would have been just as easy and probably cheaper to have just made points capable of handling the 12 volts, instead of the ballast resistor and the associated hassles.

 
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