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Your sig show 200K on subject car.
If the alternator is still original, you are past the window for replacing it.
Alternators generally last between 160-180K miles before needing replacement.
Replacing the VR on an original alternator with 200K miles is not a lasting solution.
The dash light that should glow when the alternator is not putting out sufficient voltage is in series with the exicitation voltage. Unlike a generator, an alternator needs a voltage source to begin charging. As voltage reaches parity between battery and alternator output the light doesn't light, as there is the same DC voltage on either side (i.e., no ground). The alternator/regulator CAN fail in a manner that will not light up this light, it's happened twice in my cars.
Jim
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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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