Checking that coil reference, it comes out as 14 volts, so not a 9 volt coil for a ballasted system, see https://www.autodoc.co.uk/bosch/676491

I suppose that if you have a ballast resistor in the wiring, the feed to the coil will only be 9 volts once the starter motor is no longer turning. What voltage do you have at the coil with the ignition on but the starter motor not turning? It should be 12 volts.

Tony