Re: 12 volt coil without resistor

Posted by KEB on January 14, 2006 at 18:04:08 from (209.108.192.162):

In Reply to: Re: 12 volt coil without resistor posted by Sam#3 on January 14, 2006 at 17:51:32:

Actually, it does matter. The return path for the high voltage pulse back to the coil is from the engine block, through the condensor & the wire connected to the points. Doing it this way allows the voltage induced in the primary winding to be added to the voltage induced in the secondary winding, giving a little bit hotter spark.

That's also why the case of an ignition coil does not have to be grounded for it to work - the high voltage current does not return through the case of the coil. If you put the ballast resistor between the coil and the points, you've added series inductance to the high voltage point path (wire wound resistors like a typical automotive ballast resistor have significant inductance and are intended to be used only in DC circuits).

Put the resistor between the power source and the coil, not between the coil and the points.

Keith

Replies:

• Re: 12 volt coil without resistor Bob 18:47:08 01/14/06 (0)

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