J, If the rotor is pointing to a location between the terminals when the spark happens, there is an issue. The distributor cam (on this distributor) is on the same shaft as the rotor notch/flat that indexes the rotor. If the points are the wrong ones (even if they fit on the backing plate) the rubbing block will be in the wrong place. This can be one cause of that wrong rotor position. The wrong rotor can also be blamed for the issue fitting is not the same as indexed. a cap that fits is also suspect for displaced terminals. The rotor will fail if the spark needs to jump 1/2" every time it fires. The rotor tip should be within its width pointing to the terminal, as the points break. If not is is wrong. JimN
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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