![]() When the "R" terminal wire isn't connected, there may not be enough voltage under crank to fire the motor. The bypass is in addition to the standard ignition-switch-to coil (+) wire that, after the engine fires exclusively supplies power under normal "run" conditions, but at lower than 12 volts because there is (or should be) a voltage-reducing ballast-resistor or resistor wire in that circuit. The way Chevy temporarily supplies full voltage to the coil on an old points system is via an extra "bypass" (usually yellow) wire that runs from the R-terminal on the starter solenoid to coil positive (+) it's "hot" only under crank conditions. To avoid burning out the ignition points on an old Chevy points system, there must be full battery voltage (12 volts) under crank, but about 9.5 volts under "Run". You need to check voltage under cranking conditions. Proper voltage under crank and run conditions? You say, "I'm getting 12 volts to the coil and points area." If that's just a static voltage check-it's not definitive.
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