Why are the headlights and dash lights flickering when on the brake after replacing the alternator?

Asked by Le85 Jul 26, 2012 at 11:49 AM about the 2003 Ford Focus SE

Question type: Maintenance & Repair

I just replaced the alternator in a 2003 Ford Focus SE but the dash and headlights now flicker when you
are on the brake. What could be causing this?

2 Answers

40,735

Chances are the alternator is bad if it didnt do it before. The diodes in the alternator can go out and cause pulses is voltage at low rpms.

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