ignition analyzer IA-1

[Roy MacMillan]

Hi, I have been looking for a Heathkit IO-20 ignition analizer for over a year without success but recently was given an earlier model, number IA-1. This is in near perfect condition except that it has a wire from the coarse speed switch which is dangling loose and I can't find where it should be connected. I didn't get a manual or schematic with the unit and was hoping that someone can help. 

                                                                            Roy Macmillan

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