Electric choke

Yes but do yourself a favor first. If you are using stock wiring and the factory bulkhead connector, check the harness for "voltage drop."

Turn the key to "run", engine OFF

Put one probe of your meter on the battery POS post. Stick the other probe on the IGN feed, IE where you got rid of the resistor. You are looking for a VERY low reading, anything over .2V means you should look things over, .3V or more (that's three TENTHS of a volt) get more serious

Your suspects are the bulkhead connector, the ignition switch connector, and the switch itself.

If you have significant drop, it will cause overcharging. If you can't find it and don't want to mess with it, add a relay triggered off the original "ign run" wire to key the relay, and run the ignition/ choke/ and alternator field/ regulator off that