^^Steve is all wiring connected with above tests?^^
2,........ign2, 10V.......This is likely OK depending on condition of battery. This is why I measure these from this point TO THE battery PLUS so that you see the drop, and the battery voltage becomes unimportant. EG........if your battery is low, and cranking the battery is only 10.5V, then this 10V reading is just fine
5. Key "start" 1.5mV.................if you disconnected something, this is likely OK, as IGN1 goes dead when cranking. With wiring properly connected, this will show some backfeed through the resistor from the IGN2 start voltage. I would expect a fairly low reading, perhaps a volt or two.
6. Key "On" 10.98 volts. A drop of 1 volt?? If your battery is fully charged THIS IS WAY LOW. I thought I told you this earlier. You seem to have the common drop in the ignition harness. "Chase" this back through the path to the battery..............bulkhead connector............ammeter............switch connector........switch itself.