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Old 04-03-2010, 12:25 PM
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HEI No Spark

Hey guys,

I have a Model A coupe I'm working on with a 4 banger Model A motor. I am changing over to 12 volts and had a old Mallory distributor converted to electronic with a relector and pickup coil that is fired with an external HEI module. The problem is I'm getting no spark. The motor turns over fast, but still no spark. I have all new parts, new coil, new battery and everything. The only part that is still 6 volt is the starter, which I'm told doesn't matter or care that its 6 volt or 12 volt.

I'm including a picture of my wiring. I have the most basic wiring I can get to rule out any problems. I talked to the guy who did the distributor and asked about the spark plug wires which are the old style cloth wrapped wires but he said that wouldn't matter either.

Is there anything I can test or rule out that might be a problem? Any tips or help would be appreciated. Thanks.

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Old 04-05-2010, 06:28 AM
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There should be a third wire running to the coil "+" terminal that supplies switched voltage for the ignition.

The "+" wire coming up from the starter (attached to the solenoid "I" terminal) isn't needed. In a points-type ignition, this wire would supply full battery voltage to the coil for starting, then would switch (when the started was disengaged) of the running voltage (less than full battery) to the coil.

IIRC, in your case, an internal resistor equipped coil would be what you want, as opposed to a coil that requires an external ballast.

It's possible that "W" and "G" need reversed, or you got a bad module. Not too likely, though.

The pickup coil and reluctor is compatible w/the HEI? The gap set correctly?

Last edited by cobalt327; 04-05-2010 at 06:58 AM.
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