What volts should the coil read during cranking?

1973 DODGE TRUCK
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BSAM450
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When I turn the key on the test light on the positive side of the coil lights up. When I crank the engine over the light goes off. It seems to me when I let off the key it will then fire. Can you help me in the right direction.
Feb 25, 2012 at 5:32 PM
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HMAC300
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replace the ballast resistor on the firewall. that sounds like your problem.
Feb 25, 2012 at 6:34 PM
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BSAM450
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Well I forgot to mention that I did replace the resitor on the wall and also the module box. It wouldn't even fire before that.
Feb 25, 2012 at 7:07 PM
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HMAC300
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check gap of pickup coil in dist .008-.010" resistance of pu coil should be 400-800 ohms
Feb 25, 2012 at 7:16 PM