Question about 2001 Ford Focus
A change in voltage from the alternator can cause this.
The most common cause is dirty battery terminals.
Take them off, clean and grease them, and put them back on.
They check with a voltmeter.
should be 12.5 at idle, and above 14 at high rev, but not over 14.5.
If over 14.5, then have alternator rebuilt.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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