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I am not familiar with the resistor you are referring to, but here is my understanding of the system.
Hello, don't know if you've made any progress on your charging issue yet or not so thought I'd try to address a few of your questions.
Colors are based on original 3.0 installed in the 911.
The Red/Black wire should be switched ignition power and supplies power to the Alt charge light. You should get 12V at the Red/Black wire with the key in the run position. This should supply power to the bulb socket for the Alternator charge indicator light.
The other terminal on the bulb socket should be attached to a Blue wire. This wire should then run back to the D+ terminal of the voltage regulator. Without the engine running the blue wires should ground through the regulator to illuminate the Alt charge light as the initial test indication for the bulbs.
The alternator needs to have the field excited to begin charging. This is accomplished through the power supplied by the Red/Black wire through the indicator bulb then through the Blue wire to the voltage regulator. If the indicator light does not pass enough current when illuminated (likely your problem since you are using an LED) with the key turned to run position the alternator field will be too weak to induce charging. I would suggest replacing the LED with a standard incandescent ALt charge bulb. adding a resistor to the circuit for the ALt charge light will only decrease the available current for creating the field, which is why it increased the necessary RPM to get the alt to start charging.
when you get the RPM high enough the Alt will start charging even with a weak field. Once the Alt starts to generate power it can then use the generated power to supply the field windings. This is why once you hit the necessary RPM the Alt will start working and stay working till you shut the car back off.
Let me know what you find and I'll see if I can help further.
Good luck,
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