When my alternator went out it caused all kinds of strange electrical issues from ACC to radio and starting issues. You might be able to change the voltage regulator without removing the alternator, but you'd have to be pretty dextrous in my opinion. Removing it is not so bad. Good luck.

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1984 Astral Grey 300TDT - The French Fry
1979 Yellow 300SD - The Pomme - SOLD
1985 Light Ivory 300DT - Fritz
1987 Anthracite Grey 300SDL - ?