If this is true how does my coil get enough current without the Bypass?
The coil primary circuit is wound to function at 100% efficiency at approximately 9 volts, which just happens to be what's available with the starter drawing its full load. The bypass supplies full battery voltage to the coil while the starter is running, then the resistor falls back into the circuit as soon as cranking stops to prevent overcurrent from damaging the points. Starting without the bypass results in the coil working at around 60%-75% efficiency, adequate for most starting needs, but not all. The most likely time the ignition voltage will be inadequate will be very cold starts, or very hot starts- - - -times the starter will be drawing more than normal current and reducing the battery voltage enough to starve the coil for current. Since the starter has far less resistance than the primary winding of the coil, the lion's share of the juice will go that way- - - -resulting in poor or no spark. Bypassing the resistor gives the coil the extra kick needed to assure the plugs get enough spark during hard-start conditions.
Jerry
