Hi, I have a 2001 Transit 330MWB 2.4TD based Campervan (Autosleeper Duetto). When the van is idling the speedometer needle moves between 0 15mph and the odometer also moves registering mileage. I recently had a service & MOT which needed some welding work. On driving away from the garage I noticed the Battery Warning light was on, so I went straight back. They said the alternator needed replacing, which they did (£200). Ive since noticed this speedo/odo problem. I replaced the Battery (7yrs old) this morning, but the problem is still there. Any ideas please? Im not very technically-minded!
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