PI marker usage up to, and including series F2A (the Iron Head cars):

  E51070, Bush, Numbered for distributor wire (Distributor end), 1 ea, style Z.

  E52369-74, Bush, Numbered, 1B to 6B, for battery ignition wires (Distributor end), 1 ea, style B.

  E71190-5, Bush, Numbered, 1M to 6M, for magneto ignition wires (Magneto end), 1 ea, style M.

  E72986-91, Bush, Numbered, 1B to 6B, for battery ignition wires (Spark plug end), 1 ea, style BB.

  E72979-84, Bush, Numbered, 1M to 6M, for magneto ignition wires (Spark plug end), 1 ea, style MB.

  E2807, Terminal for ignition leads, 12 ea, an eye hook 31/32" long which allowed the use of blind ended markers. This is the same terminal number used on the series J-P Ghosts, not the Chater Lea of the last Ghost series. Blind markers could not have been used with the Chater Lea.

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Besides the PI Parts Index , there are three drawing numbers applicable to the PI, but only E71200 is for the earlier, iron head cars. We do not have the GA, but both page 1* and page 2* of LOP E71200 are located on the RROC, PI disc under the Wire Fittings heading. They are titled for E.A.C. or Eastern Armored Car, an early code named used during PI development. The Parts Index is dated October 1926 and its marker information agrees with E71200 dated 1.11.23. We have combined the information from the two pertinent pages of the index into a smaller file size JPG which will be easier to download than the individual drawings.

The marker part numbers and descriptions are explicitly and completely called out leaving no doubt about which part was used where. To our knowledge, this is the first model for which wire markers with a blind bottom were used. Why they were introduced is a mystery, especially so since they were discontinued after three years of iron head PI use and not called for again until 1933 when the exact same style BB part numbers were specified for the 3 1/2L Derby Bentley.