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Cheng:
If you have never replaced the voltage regulator, I advise you do whether or not it's the problem. You see, the regulator has these two little arms with springs on them (brushes i guess) that push against something spinning in the alternator. The first one I replaced had one worn and the other not. Anyway, at idle you can test it's output fine, but who knows what is happening at 80 miles per hour on the highway. Your problem is getting worse quicker...I'm betting the regulator or a loose wire. Regulator is 340.00 replaced at the dealer. They could run some tests for you two. Part alone is 242.00 at speedycarparts.com.
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