Hi Frank
We have an 04 ducato motorhome with the same problem - it only works on fast speed - we are on our second rheostat in as many months, and will be taking it back next week for the garage to investigate further - will keep you posted as it seems its more than just a rheostat replacement - i can only tell you that it sits in the engine bay somewhere,, and has a fitting time of less than an hour - hope this helps.
PS - Stay well away from Marquiss Tewkesbury - they farm all their mechanical work out, and you dont see your vehicle for weeks !!!
Cheers
Adie
Adie
September 2008
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