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When you say "wouldn't start", does that mean it would crank but not start, or wouldn't crank? As the battery was discharged, it is likely someone left the ignition switch on, and the coil was cooked. By running a jumper to the coil, and bypassing the resistor, it probably gave the coil enough voltage to start the engine. It is likely that the voltage regulator is OK, and removing the battery connection had no bearing on the problem, unless it was then connected to the coil by a jumper. The battery wire to the regulator is a direct path from the regulator to the battery. When the ignition switch is bypassed, it hs no connection to the coil, and the starter button will work whether the switch is on or off. It is possible that the cutout relay in the regulator was stuck shut, but if the car shows a charge when running, it is likely OK, too. Usually , if stuck, it will run down the battery, and damage the generator.
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