I have read up on installing and wiring a mini denso. The indicator light is not part of the exciter, therefore it doesnt need to be an incandescent bulb.
Your Ignition in hot wire takes care of that. It appears that the denso warning light just goes from an Ignition on hot source to a light , then to the connector on the alternator marked L for light. None of the schematics i have seen to wire up a denso setup show a resistor in parallel with the light. I did a lot reading and research as to how to hook one of these densos up. The light circuit is not required to run it.
But i am assuming you are talking about just old delco alternators wired this way.