Not getting 12 volts to coil

wrecks said
I have 10 volts when cranking the IGN2 J3-14BR wire on the ballast resistor.

The cranking votlage test shown here?

10 Volts passes.
In this test the coil connection to the distributor is removed.

wrecks said
Doing a voltage loss test on the other side of the ballast resistor with the key in 'run,' I get 2 volts loss (J2A-16DBL wire), but I don't know if some other component should be disconnected.

Yes. Two volts is a lot, but to use the 0.4 V max on your 1970 instead of just one wire to disconnect, there will be a few.

Remove the triangular plug on the voltage regulator and also disconnect the carb solenoid.
I dont see an electric choke assist on the diagram, so I think that's it.

Now test it and see if the voltage .4 volts.
Also the ammeter should move less during the test with those two items disconnected.

I would then do the voltage drop test for the circuit going to the rotor.
Connect the triangular plug to the regulator.
Disconnect the wire going to the coil and don't let th ering terminal touch ground. Maybe easier to disconnect the coil ground.

If I recall the test allows up to .55 Volt drop be we should check that.
Probably can find the same test in the '70 shop manual.

wrecks said
One complicating factor is that I have dual points, and I've checked both are closed when doing 'run-IGN 1' tests. I have .017 " gap when open (not much).

As long as either one is closed thats all that's neccessarry for current to flow through. The dual points extend the dwell time (in degrees) so there is more time (in fractions of second) at high rpms.