Maybe at the higher RPM the alternator has enough output that it back feeds through various paths that it shouldn't. Where at the lower RPMS the output is to low to cause a noticeable problem. All I know is electricity is force that goes by path of least resistance from source to ground. If that path happens to be feeding through ign. system it will go there, possibly causing problems with spark. I may be wrong, someone will correct me, we all learn.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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