my ACC behaved like yours and it turned out to be some desoldering of the two pots that are associated with the spin wheel. I would get random results (i.e., contact would be made then lost, then made, then lost....).

THis was 12 years ago, and still going strong with the original ACC.

__________________
Jovan

'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)

'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
'19 Range Rover; 30kmi