With the ignition switch on, and the points closed, (engine stopped) measure the voltage at the + terminal of the coil. With the correct size resistor, it should be approximately 9 to 9.5 volts. Don't leave the points closed long - - -they will overheat and burn.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!