You wrote: "I have never understood why they in a resistance that would supposedly restrict current flow anyhow."
Sounds like its almost counterproductive, doesn’t it?
Actualy one system has resistance in the wires with W7DC spark plugs and the other other has resistance in the spark plugs itself in the WR7DC.
This what I undestood from post on this board. Otherwise WR7DC spark plugs with the original resistance wires is doubled. Not good I suppose although it could work under ideal conditions.
I beleive the blue Volvo wires had about 6k ohm resistance.
Have a good day.
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