I also ran a wire off the connection at the resistor in order to get 12V to the the carburetor's automatic choke. That wouldn't change the voltage at all but it would split the current between the carb and the regulator/field. Could that mess it up?
In a roundabout way, it will / may cause OVER charging.. I've posted a bunch about voltage drop in the ignition feed causing overcharging because it feeds the voltage regulator low voltage. So if you put extra load on that circuit point, it will drop further. However the factory did the choke just that way. This problem is why I advocate "for a simple fix" to cut the ignition (IGN1 or ignition run) coming out of the bulkhead, feed a relay coil, and then connect the load contacts to the engine bay end of the wire you cut. Feed the relay with a large fuse/ breaker off the starter relay.
But for later LOL. I'd worry about this problem now