slant six starting problems

With 12.2v at the battery with ign on only, the battery is not fully charged. A drop to 10.7 cranking does not shock me for a good but partly discharged battery. Forgive the pun.....lol

The only thing I do not know for sure is if this particular multimeter is responding properly to any reluctor pulses; an older analog meter would be more confidence inspiring. But, digtial the multimeter readings are so low as to be just low level noise with no actual pulses, so that part is very probably the problem. It should be noted that the the reluctor output by itself has no dependence on the battery voltage whatsoever.

The symptom of a hot ballast + no spark at all while cranking adds up to the ECU not opening the - coil circuit to generate the spark (or a shorted coil - wire to ground, which dies not appear to be the issue), and which is consistent with no reluctor pulses. A reluctor failing when hot and progressively getting worse is consistent with that type of part too. The fact that a good spark is apparently generated when the ignition is turned off also seems consistent; the ECU shuts off with the ign siwtch and the coil current is interrupted and that spark is created. That is the present diagnosis/edcuated guess/whatever you want to call it....