Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - bad alternator causing rough idle ?
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Old 02-12-2013, 12:43 AM   #4
bd8134
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If you think you have a bad alternator you should either get it checked out for sure or replace it. Autozone or Advance Automotive do this for free. It is a more comprehensive test with it removed.
Yes low voltage can cause a bad idle and you may end up breaking other parts if you drive it like that.
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