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I have a 64 truck and it come with a hei distributor. I have switched back to a normal distributor. Do I need to add a ballast resister? I've heard the harnesses have one installed in the wiring loom? Is this true. Thanks
 

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Yes, the OEM wiring should have a resistance wire, but whomever converted it to HEI may have removed the wire. Find a wiring diagram and determine if the original wire is still there. If not, you will need to add a resistor to keep from burning up the points.
 
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