Correct voltage at coil-9N

I know the problem is primary wire to coil or perhaps a bad coil- I just don't want to "change parts" till I stumble onto a fix.

Thanks for any insight or info--Radar

First read the voltage at the terminal block (6 volt junction) These readings are taken with the points closed. You should read approximately 6.3 volts. Then go to the other side of the ignition switch (Igntion switch wire and right side of ballast resistor.) The voltage should be 6.3 volts here also. (Sometimes old ignition switches drop a volt or 2 here due to crud on the contacts.) Then move to the other side of the ballast resistor and you should have between 3 and 4 volts here. (same as the top of the coil...)
Happy Motoring
Claus

1 volt at the coil terminal is MUCH too low. Don't forget the possibility of a "bad" ignition switch.

Unless you have "lab grade" ohm meter, it will be difficult to measure the less than 1 ohm value of eather the ignition coil or the "ballast resistor". But even a cheepy voltmeter is accurate enuff to measure 3 - 4 volts. This is why we tell those with FMD to measure the coil input terminal voltage.

The infamous ballast resistor is mounted on the backside of the dash panel and automagically changes value with tempature, about 0.5 ohms cold, 0.7 ohms at operating temp. This is Ford's way of providing a "hotter" spark at start-up and tapers off the coil current to about 3 amps during normal running. If your coil is drawing too much power (amps), it will melt the insulative tar and shortout some of the coil turns and reduce your sparkies and your engine will run crappy or not at all..... ..... Dell