Asked by May 05, 2016 at 09:40 AM about the 2001 Oldsmobile Aurora 4 Dr 4.0 Sedan

Question type: Maintenance & Repair

When I'm going 80 to 90 miles an hour my
check charge system comes on and my
voltage drop to 12.5 what could be causing
this I just bought a new alternaor

2 Answers


may be internal voltage regulator (inside alternator), have your charging system checked


Could be a "flying open" in the replacement alternator, and that means when it reaches a certain rpm a circuit opens up shutting the charge rate down, or the computer is turning the alternator off as it is sensing a very high engine demand and is shutting off accessories until the load ceases, just like the wide open throttle switch use to do for air conditioning. Your a trusting soul going those speeds with an obsolete vehicle. What is the speed rating for the tires? How are your brakes?

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