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Old Apr 22, 2012 | 09:52 PM
  #1  
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No Spark

390 in a 75 f-100. Ignition module tested and good. Swapped out the coil and no difference. New ignition switch. Getting fuel but no spark. No clue as to what to try next.
 
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Old Apr 22, 2012 | 11:22 PM
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Is there juice to the module?

If you start with no juice at the plug, you have to track back till you find electricity. Then you've got your problem point usually. Don't skip components and check wires and grounds along the way.
 
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Old Apr 23, 2012 | 08:46 PM
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I dont see where power comes into module by looking at schematic. Is it the lead coming off the I post on solenoid? Which wire going into module do I check? My module is the one with the blue bracket at wires if that helps.
 
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Old Apr 23, 2012 | 10:18 PM
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The red wire is running voltage, the white wire is energized for starting.
 
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Old Apr 25, 2012 | 09:48 PM
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Thx for that I will test it tomorrow.
 
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Old May 3, 2012 | 09:40 PM
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Tore into the wiring harness and found lots of wires hacked together and in some cases burned through. Replaced it with one from the boneyard and all good.
 
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