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Good evening to all, once again, Well it has been a few months, maybe three, since I replace that miracle of an alternator on the '99 STS. The water cooling has worked exceptionally! I wish I could get an alternator which would do the same with electricity! Saturday should be my third alternator change out, so I am hopefully getting pretty good at it! Bought the car with 37,k on it years ago. At ~120,k the alternator failed. Shop said it was a rebuilt. I thought that odd. Unable to get it rebuilt, so I bought a rebuilt unit for $175 with 'all new parts'. Ten months later it ate a bearing. Replaced at no cost, just a lot of my labor. Now it is failing to charge. Car says no charging going on. Volts at 12.2! Battery light flashed on a few times, but generally stays off. I am charging the battery and driving 20 miles one way to work, and charging again. Worked that way for two days now. Battery volts never drop below 12.2. I have verified with digital volt meter on the road. Twice the volts jumped up to 14.4, I stopped and verified with meter. It is easy when you drive around with no back seat! LOL Alternator shop says they will have another in the morning! i'll let you know how it all turns out. Could there be an underlying cause? The little clip on device located on the hot wire is in place and looks fine. Thanks for listening! Ohio Jim