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Have fuel but no spark.Jumped to coil from battery. 700 1987

I have fuel delivery but, no spark on '87 740 turbo.I ran an external wire from pos. battery to pos.(15)coil terminal. Runs but, I'd like to know what is wrong and correct it. The tachometer also works with this arrangement. I am pretty certain the Hall Sensor and ignition power stage(ignition amplifier)are fine.Any advice would certainly be appreciated. THANKS






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