Help! No spark; spare some knowledge sir; will work for spark

Discussion in 'Troubleshooting & Diagnosis' started by Fair weather fan, Oct 18, 2017.

  1. Fair weather fan

    Fair weather fan New Member

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    350,HEI, The car didn’t spark with the old distributor, the car still doesn’t spark with the new Distributor. The test light comes on when the ignition is turned to the on position and and when in crank position(The test light is from chassis ground to the Batt terminal on the distributor. The rotor turned On the old distributor which I think means is functioning mechanically; ?? What should be my next step?
     
  2. RS1979

    RS1979 Veteran Member Lifetime Gold Member

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    New or old coil?
     
  3. Fair weather fan

    Fair weather fan New Member

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    New coil and distributor complete assembly, I’m presuming it is not defective because it’s new , but I guess that may be questionable.
     
  4. SRGN

    SRGN Veteran Member

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    If you're checking at the end of the plug wire, try pulling the plug wire at the cap and see if you get spark from the cap by holding a ground wire or grounded old style test light near the terminal where you pulled the wire from. If no spark there, pull the cap off the distributor but leave the module wire and power wire connected. Check for spark from the center terminal while cranking. If no spark there, most likely bad coil or module if you have power.
     
  5. ol' grouch

    ol' grouch Veteran Member

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    I tracked down one once like that and the graphite stud in the middle of the coil was missing. It makes contact with the rotor.
     
  6. Fair weather fan

    Fair weather fan New Member

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    I will be doing those checks this evening and seeing what's what.BRb
     
  7. budro6968

    budro6968 Veteran Member

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    Hook the old one straight to the battery full 12 volts and ground, roll it over by hand with one of the plug wires and to a ground to check for spark. you could do the same with the new one. HEI's are powered by one wire so it is simple. You should check the Batt wire for a full 12 volts with a VOM. The only other thing I can think of is your plug wires them-selves. The resistance may be too high. Use your VOM to ohm them to see what you get.
     

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