adding a charging fault light

67Dart273 said
On the older Delcos, the lamp circuit is the "exciter." Originally it was lamp in parallel with a resistor, so if the bulb failed, it would still excite. Frankly I'm surprised that an LED would excite "all" Delcos. Might be a "one wire" regulator.

Many guys used to mistake using the older Delcos in a swap, leave out the lamp, and wire the no1 connector direct to the key. That might work once, twice, or 507 times, but some time or other, it will take out the diode trio. You must have a diode or resistor or lamp in the no1 lead to protect it.

Some of the later model Furies? and other sleds had a warning lamp for the charging system. I will have to look them up. Forget what was involved, there

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.