adding a wire for my electric choke.

I don't know about the Denso alternator you are using, but I know the older GM type, since used in my 1985 M-B. Those are the "Motorola design" and have an "excite" wire that goes to one or more dash bulbs. That wire needs a current inflow (from BATT+ - key - bulb) into the alternator "excite" (D+ in my Bosch alt). That slight current "boots up" the internal "field generator". Once that boots up, the current flow stops (bulb goes out). If the dash bulb(s) fail, the alternator doesn't ever boot up and thus output. I found this when I replaced w/ LED bulbs. An old alt may boot-up at higher rpm from residual magnetism.

I think the Denso alternator in my 1996 Plymouth has the same basic design as in our old cars, i.e. an external Vreg (inside the PCM). Perhaps not all Denso's work the same.