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Help answer this question below.
check all your ground wires if not it also check your hot wires junction block by the battery. hope it's one of 2.
Here is a charging systems diagram for a 1983 Vette. (I think they are the same) I believe the regulator is internal to the alternator. There are several fusable links that may be blown, They are special wires that act like fuses and I would check all the connecions for corrosion. There is a test hole on the back of the alternator. It is D shaped. If you put a small screwdriver in the hole and short the contact in the center to the case, it will turn the alternator on full.
Hope this helps

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