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1981 911 SC Alternator Warning light does not light up

Electrical

Vehicle Information: Model: 911SC; Year: 1981; Body Type: Coupe; Total Mileage: 80,000;

My alternator warning light does not come on when the ignition is on and the engine is off. I checked the lamp across the car's battery terminals and it lit up so I think the bulb is ok. I discovered the harness that I believe contains the blue D+ wire from the alternator to the external voltage regulator, and which should then go to the instrument cluster for the lamp, if my research is correct. This bundle ends in a three prong female terminator with a blue, black, and brown wire. However, there seems to be no place to plug it in. I assume the alternator in my car has been replaced with the newer internal solid state regulator. Do I need to expose the alternator to figure out where the problem is or can I work with the harness that deadends in the engine compartment next to where the voltage regulator might have been? I'm concerned about shedding an alternator belt, or having some other problem that the light should alert me to.

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