Hi everyone, I hope someone can help,

I have a 2000 Ford Fiesta Ghia 1.25. Fairly often while driving or idle, the headlights will either dim slightly or go slightly brighter. At the same time the windscreen wipers will go either faster or slower, the heater blower will speed up or show down, the dash illumination with either or brighter or dimmer. On some occasions, after the lights etc go brighter in conjunction with the other symptoms, the dash clocks will fail. They'll just act like the engine is off but the illumination will still be on. After a minute or so, they'll come back on with the needles moving to the maximum mark then back to normal. The digital display also goes out but comes back on with the rest of the lights.

I have had the battery replaced as it had a bad cell. Does this sound like an alternator problem?

Many thanks for any help anyone can offer